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Glacier-Fed Lakes Are Significant Sinks of Carbon Dioxide in the Southeastern Tibetan Plateau J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-04-16 Meizhuang Zhu, Xingxing Kuang, Chunlin Song, Yuqing Feng, Qiule He, Yiguang Zou, Hui Zhou, Chunmiao Zheng
Dissolved inorganic carbon (DIC) sources, transportation, and transition in inland water bodies have been intensively studied due to their important role in the global carbon cycle. While glacier-fed lakes play a crucial role in global carbon cycling, related studies are limited. In this study, we investigated the spatiotemporal variability of DIC in the maritime glacier-fed lakes of the southeastern
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Vegetation Loss Following Vertical Drowning of Mississippi River Deltaic Wetlands Leads to Faster Microbial Decomposition and Decreases in Soil Carbon J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-04-15 C. A. Creamer, M. P. Waldrop, C. L. Stagg, K. L. Manies, M. M. Baustian, C. Laurenzano, T. G. Aw, M. Haw, S. L. Merino, D. R. Schoolmaster, S. Sevilgen, R. K. Villani, E. J. Ward
Wetland ecosystems hold nearly a third of the global soil carbon pool, but as wetlands rapidly disappear the fate of this stored soil carbon is unclear. The aim of this study was to quantify and then link potential rates of microbial decomposition after vertical drowning of vegetated tidal marshes in coastal Louisiana to known drivers of anaerobic decomposition altered by vegetation loss. Profiles
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Generalizing Microbial Parameters in Soil Biogeochemical Models: Insights From a Multi-Site Incubation Experiment J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-04-15 Siyang Jian, Jianwei Li, Gangsheng Wang, Jizhong Zhou, Christopher W. Schadt, Melanie A. Mayes
Incorporating microbial processes into soil biogeochemical models has received growing interest. However, determining the parameters that govern microbially driven biogeochemical processes typically requires case-specific model calibration in various soil and ecosystem types. Here each case refers to an independent and individual experimental unit subjected to repeated measurements. Using the Microbial-ENzyme
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Trade-Off Between Light Deprivation and Desiccation in Intertidal Seagrasses Due To Periodic Tidal Inundation and Exposure: Insights From a Data-Calibrated Model J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-04-09 Xinyan Wang, Matthew P. Adams, Dongdong Shao
Some seagrass species thrive in shallow intertidal zones globally, adapting to periodic tidal inundation and exposure with distinctive physiological traits and offering crucial ecosystem services. However, predicting the responses of intertidal seagrasses to external stressors is hampered by the complexity of the dynamic and harsh environments they occupy. Intertidal seagrass growth models, especially
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Spatial, Seasonal, and Diel Controls of Nitrogen-Carbon-Oxygen Cycling During Lake-Water Infiltration to an Aquifer J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-04-05 Richard L. Smith, Deborah A. Repert, Jennifer C. Underwood, J. K. Böhlke, Denis R. LeBlanc, Robert B. Hull, Douglas B. Kent, Ariel P. Reed, Stanley J. Mroczkowski
Many freshwater lakes are groundwater flow-through systems. Although lakes commonly are considered to be sinks for nitrogen inputs, relatively little is known about carbon and nitrogen export from lakes to groundwater. The current study focused on lake-bottom biogeochemical processes accompanying the transport of nitrogen, dissolved oxygen (O2), and dissolved organic carbon (DOC) during lake-water
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Carbon Dynamics of a Coastal Wetland Transitioning to Mangrove Forest J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-04-02 D. Yannick, S. Oberbauer, C. Staudhammer, J. Cherry, G. Starr
Coastal wetlands play a vital role in the global carbon cycle and are under pressure from multiple anthropogenic influences. Altered hydrology and land use change increase susceptibility of wetlands to sea-level rise, saltwater intrusion, tidal flood events, and storm surges. Flooding from perigean spring tides and storm surges rapidly inundates coastal wetlands with saline waters, quickly surpassing
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Effects of Seasonal Variations in Seagrass Density and Storms on Sediment Retention and Connectivity Between Subtidal Flats and Intertidal Marsh J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-04-02 Qingguang Zhu, Patricia L. Wiberg
Both submerged aquatic vegetation and salt marsh are important coastal ecosystems known for their effectiveness in sediment trapping and carbon burial. However, their proximity can lead to competition for limited sediment resources, potentially compromising their capacity to facilitate sufficient sediment deposition to withstand sea-level rise. Here we applied the Delft3D flow and sediment transport
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Rewiring the Carbon Cycle: A Theoretical Framework for Animal-Driven Ecosystem Carbon Sequestration J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-03-31 Matteo Rizzuto, Shawn J. Leroux, Oswald J. Schmitz
Most carbon cycle models do not consider animal-mediated effects, focusing instead on carbon exchanges among plants, microbes, and the atmosphere. Yet, a growing body of empirical evidence from diverse ecosystems points to pervasive animal effects on ecosystem carbon cycling and shows that ignoring them could lead to misrepresentation of an ecosystem's carbon cycle. We develop a new theoretical framework
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Cohort Marsh Equilibrium Model (CMEM): History, Mathematics, and Implementation J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-04-01 M. L. Vahsen, K. E. O. Todd-Brown, J. Hicks, S. S. Pilyugin, J. T. Morris, J. R. Holmquist
Marsh accretion models predict the resiliency of coastal wetlands and their ability to store carbon in the face of accelerating sea level rise. Most existing marsh accretion models are derived from two parent models: the Marsh Equilibrium Model, which formalizes the biophysical relationships between sea level rise, dominant macrophyte growth, and elevation change; and the Cohort Theory Model, which
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A Computationally Efficient Method for Parameter Sensitivity Analysis of Microbially Explicit Biogeochemical Models Accounting for Long-Term Behavior J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-03-31 Wanyu Li, Gangsheng Wang, Daifeng Xiang
Microbial ecological models become increasingly complex owing to the incorporation of many parameters and multiple biotic and abiotic processes. However, little attention has been paid to the variations in the parameter sensitivity during long-term versus short-term simulations. Here, we developed a Multi-Objective Parameter Sensitivity Analysis (MOPSA) method to efficiently identify the important
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Lake Ice From Historical Records to Contemporary Science J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-03-31 S. Sharma, K. Shchapov, J. Culpepper, J. J. Magnsuon
Lake ice phenology is a critical component of the cryosphere and a sensitive indicator of climate change that has some of the longest records related to climate science. Records commenced for numerous reasons including navigation, hydropower development, and individual curiosity, demonstrating the value of lake ice as a seasonal event of significant importance to a broad swath of peoples and countries
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Evaluation of Selected Sentinel-2 Remotely Sensed Vegetation Indices and MODIS GPP in Representing Productivity in Semi-Arid South African Ecosystems J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-04-01 Amukelani Maluleke, Gregor Feig, Christian Brümmer, Oksana Rybchak, Guy Midgley
The ability to validate satellite observations with ground-based data sets is vital for the spatiotemporal assessment of productivity trends in semi-arid ecosystems. Modeling ecosystem scale parameters such as gross primary production (GPP) with the combination of satellite and ground-based data however requires a comprehensive understanding of the associated drivers of how the carbon balance of these
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Canopy Heterogeneity and Environmental Variability Drive Annual Budgets of Net Ecosystem Carbon Exchange in a Tidal Marsh J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-03-27 P. A. Hawman, D. L. Cotten, D. R. Mishra
Tidal salt marshes are important ecosystems in the global carbon cycle. Understanding their net carbon exchange with the atmosphere is required to accurately estimate their net ecosystem carbon budget (NECB). In this study, we present the interannual net ecosystem exchange (NEE) of CO2 derived from eddy covariance (EC) for a Spartina alterniflora salt marsh. We found interannual NEE could vary up to
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Burial of Organic Carbon in Swedish Fjord Sediments: Highlighting the Importance of Sediment Accumulation Rate in Relation to Fjord Redox Conditions J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-03-27 Emily G. Watts, Astrid Hylén, Per O. J. Hall, Mats Eriksson, Elizabeth K. Robertson, William F. Kenney, Thomas S. Bianchi
Fjords are net carbon sinks with high organic carbon (OC) burial rates; however, the key drivers of OC burial in these systems are not well constrained. To study the role of water column redox condition and OC composition on OC preservation in fjord sediments, we determined OC accumulation rates (OCAR), OC source, and OC degradation in three Swedish fjords with variable redox conditions (long-term
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Optimal Allocation Strategies of Plant Calcium on Qinghai–Tibetan Plateau J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-03-27 Chaolian Jiao, Jiahui Zhang, Xiaochun Wang, Nianpeng He
Calcium (Ca) is an essential nutrient for plant growth and development. As Ca plays crucial roles in plant structure and signaling, its allocation strategies among organs can reflect the optimization of plant functions and responses to the environment. However, the allocation strategies and spatial variation of plant Ca at the community level have not been systematically determined on a large scale
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Organic Carbon Sources in Surface Sediments on the Northern South China Sea J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-03-27 Baozhi Lin, Zhifei Liu, Timothy I. Eglinton, Martin G. Wiesner, Thomas M. Blattmann, Negar Haghipour
The burial of organic carbon (OC) in marine sediments regulates CO2 content in the atmosphere. However, the OC sources and their effect on the OC preservation in sediments of the continental marginal sea remain elusive. Here, we survey the abundance, stable carbon and radiocarbon isotopes of OC, as well as mineral surface area and grain size in surface sediments from the shelf to the abyssal plain
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Issue Information J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-03-27
No abstract is available for this article.
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Three Decades of Wetland Methane Surface Flux Modeling by Earth System Models-Advances, Applications, and Challenges J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-03-23 Inke Forbrich, Theresia Yazbeck, Benjamin Sulman, Timothy H. Morin, Angela Che Ing Tang, Gil Bohrer
Earth System Models (ESMs) simulate the exchange of mass and energy between the land surface and the atmosphere, with a key focus on modeling natural greenhouse gas feedbacks. Methane is the second most important greenhouse gas after carbon dioxide. There are growing concerns over the rapidly increasing methane concentration in the atmosphere, underscoring the need for accurate global modeling of its
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Microbial Assemblages and Metabolic Activity in Organic-Rich Subterranean Estuaries: Impact of Climate and Land Use Changes J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-03-21 Dini Adyasari, Natasha T. Dimova, Sinéad M. Ní Chadhain, Hannelore Waska
Microbial communities in subterranean estuaries mediate biogeochemical reactions of coastal groundwater discharging into the oceans; however, studies on their response to abrupt environmental changes caused by climate and land use alterations are still limited. In this study, we conducted a controlled laboratory study using combined geochemical and metagenomic approaches to investigate microbial structures
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Global Forest Plantations Mapping and Biomass Carbon Estimation J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-03-18 Hongtao Xu, Bin He, Lanlan Guo, Xing Yan, Yelu Zeng, Wenping Yuan, Ziqian Zhong, Rui Tang, Yang Yang, Huiming Liu, Yaning Chen
Management of forest plantations is a natural based solution to the global-scale mitigation of climate change; however, the role of carbon sequestration remains poorly understood, and this is hampered by a lack of detailed distribution on the global forest plantations. For the first time, we generated a global spatial distribution for forest plantations (GSDFP) during 2015 at a spatial resolution of
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Diffuse Fertilization Effect in Maize and Soybean Is Driven by Improved Light Use Efficiency Rather Than by Light Absorption J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-03-18 Zhaoyang Zhang, Kailing Zhu, Meng Fan, Quan Wang, Yunhui Tan
Diffuse radiation can improve the efficiency of terrestrial carbon uptake. Both light absorption and canopy light use efficiency (LUE) are affected by the fraction of diffuse radiation (DF). However, the relative contribution of these two factors to the diffuse fertilization effect (DFE) in the short term is not well understood. To investigate the mechanism of DFE in cropland, we collected gross primary
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Sediment Addition Leads to Variable Responses in Temperate Salt Marsh Greenhouse Gas Fluxes During the Growing Season J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-03-16 Nia N. Bartolucci, Robinson W. Fulweiler
Salt marshes play an important role in coastal carbon cycling. Unfortunately, these systems are threatened by sea level rise. One strategy to increase the resilience of marshes is thin-layer placement of sediment (TLP). While TLP can boost elevation, little is known about how TLP alters greenhouse gas fluxes. We addressed this knowledge gap by measuring greenhouse gas fluxes in TLP plots that received
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Experimental Whole-Ecosystem Warming Enables Novel Estimation of Snow Cover and Depth Sensitivities to Temperature, and Quantification of the Snow-Albedo Feedback Effect J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-03-15 Andrew D. Richardson, Christina Schädel, Andreas Westergaard-Nielsen, Kimberly A. Novick, David Basler, Jana R. Phillips, Misha B. Krassovski, Jeffrey M. Warren, Stephen D. Sebestyen, Paul J. Hanson
Climate change is reducing the amount, duration, and extent of snow across high-latitude ecosystems. But, in landscapes where persistent winter snow cover develops, experimental platforms to specifically investigate interactions between warming and changes in snowpack, and impacts on ecosystem processes, have been lacking. We leveraged a whole-ecosystem warming experiment in a boreal peatland forest
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Albedo-Induced Global Warming Potential Following Disturbances in Global Temperate and Boreal Forests J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-03-12 Qingsong Zhu, Jiquan Chen, Bourque Charles P.-A., Oliver Sonnentag, Leonardo Montagnani, Thomas L. O’Halloran, Russell L. Scott, Jeremy Forsythe, Bo Song, Huimin Zou, Meihui Duan, Xianglan Li
Forest disturbances can result in very different canopies that carry elevated albedo, thus causing substantial cooling effects on the climate. Unfortunately, the resulting dynamic global warming potential from altered albedo (GWPΔα) is poorly understood. We examined and modeled the changes in albedo over time after disturbances (i.e., forest age) by forest type, disturbance type and geographic location
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Characteristics of Dissolved Organic Matter in Uranium Hosting Aquifers and Potential Molecular Transformation During Neutral In Situ Leaching J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-03-12 Chongsheng Lu, Wei Xiu, Bing Yang, Guoxi Lian, Tianjing Zhang, Erping Bi, Huaming Guo
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Developing a Redox Network for Coastal Saltmarsh Systems in the PFLOTRAN Reaction Model J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-03-08 T. A. O’Meara, F. Yuan, B. N. Sulman, G. L. Noyce, R. Rich, P. E. Thornton, J. P. Megonigal
Coastal ecosystems have been largely ignored in Earth system models but are important zones for carbon and nutrient processing. Interactions between water, microbes, soil, sediments, and vegetation are important for mechanistic representation of coastal processes and ecosystem function. To investigate the role of these feedbacks, we used a reactive transport model (PFLOTRAN) that has the capability
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Accounting for Winter Warming Events in the Ecosystem Model LPJ-GUESS: Evaluation and Outlook J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-03-08 D. Pascual, M. Johansson, A. Pongracz, J. Tang
Winter warming events (WWEs) are short-lasting events of unusually warm weather, occasionally combined with rainfall, which can cause severe ecosystem impacts by altering ground temperatures and water fluxes. Despite their importance, how large-scale ecosystem models perform in depicting the impacts of WWEs remain largely unknown. The frequency and intensity of WWEs will likely increase further in
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Reparameterizing Litter Decomposition Using a Simplified Monte Carlo Method Improves Litter Decay Simulated by a Microbial Model and Alters Bioenergy Soil Carbon Estimates J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-03-08 S. M. Juice, J. R. Ridgeway, M. D. Hartman, W. J. Parton, D. M. Berardi, B. N. Sulman, K. E. Allen, E. R. Brzostek
Litter decomposition determines soil organic matter (SOM) formation and plant-available nutrient cycles. Therefore, accurate model representation of litter decomposition is critical to improving soil carbon (C) projections of bioenergy feedstocks. Soil C models that simulate microbial physiology (i.e., microbial models) are new to bioenergy agriculture, and their parameterization is often based on
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Agricultural Land-Use Increases Carbon Yields in Lowland Streams of the Congo Basin J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-03-08 Travis W. Drake, Simon Baumgartner, Matti Barthel, Marijn Bauters, Serge Alebadwa, Nadine Bahizire Akoko, Negar Haghipour, Timothy Eglinton, Kristof Van Oost, Pascal Boeckx, Johan Six
As the dominant mode of deforestation in the Congo Basin, shifting agriculture is expected to increase with the projected four-fold population growth for the region by 2,100. To assess how this land-use change will affect the export of carbon (C) to rivers in a typical lowland forest ecosystem, we studied paired watersheds near Kisangani, Democratic Republic of the Congo. Two streams, one draining
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Evaluation of Leaf-To-Canopy Upscaling Approaches for Simulating Canopy Carbonyl Sulfide Uptake and Gross Primary Productivity J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-03-07 Bin Chen, Pengyuan Wang, Shaoqiang Wang, Zhenhai Liu, Holly Croft
Carbonyl sulfide (COS) measurements provide an important mechanism for quantifying the terrestrial carbon and water cycles. Terrestrial photosynthesis can be inferred from vegetative uptake of COS due to the shared diffusion pathway of COS and CO2 into the chloroplasts. However, the efficacy of different leaf-to-canopy upscaling approaches for estimating plant COS uptake and photosynthesis at the canopy
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Variability in Forest Plant Traits Along the Western Ghats of India and Their Environmental Drivers at Different Resolutions J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-03-06 Ting Zheng, Zhiwei Ye, Aditya Singh, Ankur R. Desai, N. S. R. Krishnayya, Maulik G. Dave, Philip A. Townsend
Imaging spectroscopy offers great potential to characterize plant traits at fine resolution across broad regions and then assess controls on their variation across spatial resolutions. We applied permutational partial least-squares regression to map seven key foliar chemical and morphological traits using NASA's Airborne Visible/Infrared Imaging Spectrometer-Next Generation (AVIRIS-NG) for six sites
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Planktonic Marine Fungi: A Review J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-03-03 Xuefeng Peng, Anthony S. Amend, Federico Baltar, Leocadio Blanco-Bercial, Eva Breyer, Gaëtan Burgaud, Michael Cunliffe, Virginia P. Edgcomb, Hans-Peter Grossart, Paraskevi Mara, Hossein Masigol, Ka-Lai Pang, Alice Retter, Cordelia Roberts, Judith van Bleijswijk, Allison K. Walker, Syrena Whitner
Fungi in marine ecosystems play crucial roles as saprotrophs, parasites, and pathogens. The definition of marine fungi has evolved over the past century. Currently, “marine fungi” are defined as any fungi recovered repeatedly from marine habitats that are able to grow and/or sporulate in marine environments, form symbiotic relationships with other marine organisms, adapt and evolve at the genetic level
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Difference in the Contribution of Driving Factors to Nitrogen Loss With Surface Runoff Between the Hill and Plain Agricultural Watersheds J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-03-01 Zhen Cui, Cheng Chen, Qiuwen Chen, Jiacong Huang
Identifying the factors and quantifying their contributions to nitrogen (N) loss associated with surface runoff is of great significance to the control of non-point source N pollution. However, the distinct geographical units, such as hills and plains, may lead to great differences in the contribution of these driving factors, which has been rarely investigated. This study developed an effective framework
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Impacts of Hydrology and Extreme Events on Dissolved Organic Carbon Dynamics in a Heavily Urbanized Estuary and Its Major Tributaries: A View From Space J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-02-29 Fang Cao, Maria Tzortziou
Dissolved organic matter and its colored component, Colored Dissolved Organic Matter (CDOM), play a major role in global carbon budgets, and their fluxes provide an essential link between terrestrial and aquatic biogeochemical cycles. Satellite observations can uniquely capture the hydro-biogeochemical connectivity of terrestrial and aquatic landscapes, across scales. Yet, accurate satellite retrievals
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Environmental and Management Drivers of Carbon Dioxide and Methane Emissions From Actively-Extracted Peatlands in Alberta, Canada J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-02-28 M. L. Hunter, R. J. Frei, I. B. Strachan, M. Strack
The installation of drainage ditches and removal of vegetation in preparation for vacuum harvesting alters the carbon dynamics of peatlands. However, we lack the measurements to understand the spatial distribution and environmental and substrate quality controls of carbon dioxide (CO2) and methane (CH4) emissions, as well as how these factors change over the 20–30 year extraction period. For three
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Quantification of the Airborne Fraction of Atmospheric CO2 Reveals Stability in Global Carbon Sinks Over the Past Six Decades J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-02-27 Brian F. Bennett, Ross J. Salawitch, Laura A. McBride, Austin P. Hope, Walter R. Tribett
The airborne fraction of atmospheric CO2 (AF), defined as the annual global CO2 growth rate (dCO2/dt) divided by the total emission of CO2 from combustion of fossil fuels and land use change (LUC), has a long-term average of ∼0.44 over the past six decades. When quantifying trends in AF it is important to account for inter-annual variability in dCO2/dt due to natural factors such as the El Niño Southern
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Alternating Conditional Expectations: Introducing a Non-Parametric Statistical Method to Interpret Long-Term Greenhouse Gas Flux Measurements Over Semi-Arid and Wetland Ecosystems J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-02-26 Dennis D. Baldocchi, Ariane Arias Ortiz
We explore the potential of using a non-parametric statistical method called Alternating Conditional Expectations, ACE, to quantify functional relationships in biogeosciences. Here, ACE is used to quantify the non-linear and multi-faceted responses of greenhouse gas fluxes to a set of biophysical forcings, when the shapes of those response surfaces are unknown. We evaluated the statistical method over
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Issue Information J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-02-26
No abstract is available for this article.
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Carbon Emissions From Chinese Inland Waters: Current Progress and Future Challenges J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-02-24 Qianqian Yang, Shuai Chen, Yuxin Li, Boyi Liu, Lishan Ran
Inland waters are significant emitters of greenhouse gases for the atmosphere and play an important role in the global carbon cycle. With a vast land area in East Asia spanning a broad range of climatic conditions, China has a large number of natural and human-made water bodies. These inland water systems are of global importance because of their high carbon emission fluxes. Over the past decades,
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Reservoir Drawdown Highlights the Emergent Effects of Water Level Change on Reservoir Physics, Chemistry, and Biology J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-02-19 Abigail S. L. Lewis, Adrienne Breef-Pilz, Dexter W. Howard, Mary E. Lofton, Freya Olsson, Heather L. Wander, Cecelia E. Wood, Madeline E. Schreiber, Cayelan C. Carey
Water level drawdowns are increasingly common in lakes and reservoirs worldwide as a result of both climate change and water management. Drawdowns can have direct effects on physical properties of a waterbody (e.g., by altering stratification and light dynamics), which can interact to modify the waterbody's biology and chemistry. However, the ecosystem-level effects of drawdown remain poorly characterized
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Twenty Years of Progress, Challenges, and Opportunities in Measuring and Understanding Soil Respiration J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-02-22 Ben Bond-Lamberty, Ashley Ballantyne, Erin Berryman, Etienne Fluet-Chouinard, Jinshi Jian, Kendalynn A. Morris, Ana Rey, Rodrigo Vargas
Soil respiration (Rs), the soil-to-atmosphere flux of CO2, is a dominant but uncertain part of the carbon cycle, even after decades of study. This review focuses on progress in understanding Rs from laboratory incubations to global estimates. We survey key developments of in situ ecosystem-scale Rs observations and manipulations, synthesize Rs meta-analyses and global flux estimates, and discuss the
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Allochthonous Groundwater Microorganisms Affect Coastal Seawater Microbial Abundance, Activity and Diversity J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-02-21 Keren Yanuka-Golub, Natalia Belkin, Nurit Weber, Meor Mayyani, Yehuda Levy, Itay J. Reznik, Maxim Rubin-Blum, Eyal Rahav, Yael Kiro
Submarine groundwater discharge (SGD) is a globally important process supplying nutrients and trace elements to the coastal environment, thus playing a pivotal role in sustaining marine primary productivity. Along with nutrients, groundwater also contains allochthonous microbes that are discharged from the terrestrial subsurface into the sea. Currently, little is known about the interactions between
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Empirical Dynamic Modeling Reveals Complexity of Methane Fluxes in a Temperate Salt Marsh J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-02-20 Andrew C. Hill, Karina V. R. Schäfer, Inke Forbrich, Rodrigo Vargas
Methane dynamics within salt marshes are complex because vegetation types, temperature, oscillating water levels, and changes in salinity and redox conditions influence CH4 production, consumption, oxidation, and emissions. These non-linear and complex interactions among variables affect the traditionally expected functional relationships and present challenges for interpreting and developing process-based
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Linking Transpiration to Reef Nitrogen Supply on a Tropical Coral Island J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-02-19 Dirk V. Erler, Christine L. Dudgeon, Asia O. Armstrong, Eddie W. Banks, Orlando Ramirez-Valle, Hugo A. Gutiérrez-Jurado, Ben L. Gilby, Kathy A. Townsend
Coral reef islands are biodiversity hotspots with high conservation value, but we have a poor understanding of how island vegetation, through transpiration, influences groundwater nutrient supply to adjacent reef systems. Here we combine stable isotope tracing, geophysical surveys, and satellite analysis to unravel the links between transpiration and the discharge of groundwater nitrate to the waters
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Simulated Future Shifts in Wildfire Regimes in Moist Forests of Pacific Northwest, USA J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-02-22 Alex W. Dye, Matt J. Reilly, Andy McEvoy, Rebecca Lemons, Karin L. Riley, John B. Kim, Becky K. Kerns
Fire is an integral natural disturbance in the moist temperate forests of the Pacific Northwest of the United States, but future changes remain uncertain. Fire regimes in this climatically and biophysically diverse region are complex, but typically climate limited. One challenge for interpreting potential changes is conveying projection uncertainty. Using projections of Energy Release Component (ERC)
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Peatlands Versus Permafrost: Landscape Features as Drivers of Dissolved Organic Matter Composition in West Siberian Rivers J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-02-21 Sommer F. Starr, Karen E. Frey, Laurence C. Smith, Anne M. Kellerman, Amy M. McKenna, Robert G. M. Spencer
West Siberia contains some of the largest soil carbon stores on Earth owing to vast areas of peatlands and permafrost, with the region warming far faster than the global average. Organic matter transported in fluvial systems is likely to undergo distinct compositional changes as peatlands and permafrost warm. However, the influence of peatlands and permafrost on future dissolved organic matter (DOM)
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On-Orbit Spatial Performance Characterization for Thermal Infrared Imagers of Landsat 7, 8, and 9, ECOSTRESS and CTI J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-02-14 T. R. H. Holmes, B. Poulter, J. McCorkel, D. E. Jennings, D. L. Wu, B. Efremova, A. Shiklomanov, W. R. Johnson, M. Jhabvala, S. J. Hook
In this analysis of the spatial resolving power of thermal imagery products we focus on four satellite instruments that are used in research and applications, for example, to monitor land surface temperature and derive evapotranspiration. These are thermal imagers on Landsat 7, Landsat 8, and Landsat 9, as well as the ECOsystem Spaceborne Thermal Radiometer Experiment on Space Station (ECOSTRESS).
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Grass Evolutionary Lineages Can Be Identified Using Hyperspectral Leaf Reflectance J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-02-13 Ryan Slapikas, Stephanie Pau, Ryan C. Donnelly, Che-Ling Ho, Jesse B. Nippert, Brent R. Helliker, William J. Riley, Christopher J. Still, Daniel M. Griffith
Hyperspectral remote sensing has the potential to map numerous attributes of the Earth’s surface, including spatial patterns of biological diversity. Grasslands are one of the largest biomes on Earth. Accurate mapping of grassland biodiversity relies on spectral discrimination of endmembers of species or plant functional types. We focused on spectral separation of grass lineages that dominate global
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Seasonal Wetlands Make a Relatively Limited Contribution to the Dissolved Carbon Pool of a Lowland Headwater Tropical Stream J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-02-07 Vanessa Solano, Clément Duvert, Lindsay B. Hutley, Dioni I. Cendón, Damien T. Maher, Christian Birkel
Wetlands process large amounts of carbon (C) that can be exported laterally to streams and rivers. However, our understanding of wetland inputs to streams remains unclear, particularly in tropical systems. Here we estimated the contribution of seasonal wetlands to the C pool of a lowland headwater stream in the Australian tropics. We measured dissolved organic and inorganic C (DOC and DIC) and dissolved
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Hydrology Controls Dissolved Organic Carbon and Nitrogen Export and Post-Storm Recovery in Two Arctic Headwaters J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-02-06 Arial J. Shogren, Jay P. Zarnetske, Benjamin W. Abbott, Amelia L. Grose, Abigail F. Rec, Jansen Nipko, Chao Song, Jonathan A. O’Donnell, William B. Bowden
Climate change is rapidly altering hydrological processes and consequently the structure and functioning of Arctic ecosystems. Predicting how these alterations will shape biogeochemical responses in rivers remains a major challenge. We measured [C]arbon and [N]itrogen concentrations continuously from two Arctic watersheds capturing a wide range of flow conditions to assess understudied event-scale
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Mercury Mobility in Epibenthic Waters of a Deltaic Environment J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-02-02 Daniel Cossa, Duc Huy Dang, Bastien Thomas
Mercury (Hg) cycling at the sediment-water interfaces (SWI) encompasses multiple homogeneous and heterogeneous biogeochemical reactions whose result is not yet elucidated. Estuarine SWIs, where the organic matter mineralization is active, constitute experimental sites particularly suitable for scrutinizing Hg speciation and mobilization. Here, we present high-resolution vertical concentration profiles
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Issue Information J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-01-29
No abstract is available for this article.
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Crucial Role of Bacterial Processes in the Net Community Production of the Amundsen Sea Polynya Disclosed by a Modeling Study J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-01-30 Young Shin Kwon, Doshik Hahm, Tae Siek Rhee, Hyoun-Woo Kang
We investigated seasonal net community production (NCP) variations in the productive Amundsen Sea Polynya, integrating observational data and ecosystem modeling. NCP estimates (NCPO2/Ar) from in situ O2/Ar data during the austral summer (January-March) from 2011 to 2018 were compared with those from a one-dimensional ecosystem model. Early January saw the highest NCPO2/Ar values ranging from 115 to
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Climatic Constraints of Spring Phenology and Its Variability on the Mongolian Plateau From 1982 to 2021 J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-02-01 Zhihui Yuan, Gang Bao, Altantuya Dorjsuren, Ayisha Oyont, Jiquan Chen, Fei Li, Gang Dong, Enliang Guo, Changliang Shao, Lingtong Du
The start of vegetation growing season (SOS) plays an important role in the energy cycle between the land and atmosphere. Due to the limited temporal span of a single satellite sensor through time, the continuous variation of the SOS over 40 years has not been adequately quantified. Using the overlapping periods (2001–2015) between the Global Inventory Modeling and Mapping Studies (GIMMS) (1982–2015)
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Warm Early Summer Compensated Reduction in Photosynthesis Caused by 2022 Late Summer Extreme Drought Over the Tibetan Plateau J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-01-25 Ran Yan, Xunmei Wang, Jun Wang, Jingye Tan, Weimin Ju
The Tibetan Plateau (TP) is ecologically delicate, its vegetation highly sensitive to climate variations. In 2022, China endured an unprecedented compound drought-heatwave, escalating TP's August temperature to a record high since 2000. This study examined this event's impact on TP's photosynthesis using multi-source satellite-based products. We demonstrated persistent high temperatures from April
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Predicting Methane Formation Rates of Freshwater Sediments in Different Biogeographic Regions J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-01-23 Simone Moras, Ursula Ronja Zellmer, Evelina Hiltunen, Charlotte Grasset, Sebastian Sobek
Freshwater lakes and reservoirs cover a small fraction of the Earth, however their emission of the greenhouse gas methane (CH4) from the sediment to the atmosphere is disproportionately high. Currently, there is still a limited understanding of the links between sediment characteristics and CH4 formation. Earlier studies have indicated that sediment age and nitrogen content are related to sediment
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Vegetation Index-Based Models Without Meteorological Constraints Underestimate the Impact of Drought on Gross Primary Productivity J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-01-23 Xin Chen, Tiexi Chen, Shuci Liu, Yuanfang Chai, Renjie Guo, Jie Dai, Shengzhen Wang, Lele Zhang, Xueqiong Wei
Recently developed solar-induced chlorophyll fluorescence-related vegetation indices (e.g., near infrared reflectance of vegetation (NIRv) and kernel normalized difference vegetation index (kNDVI)) have been reported to be appropriate proxies for vegetation photosynthesis. These vegetation indices can be used to estimate gross primary productivity (GPP) without considering meteorological constraints
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Selective Sorting and Degradation of Permafrost Organic Matter in the Nearshore Zone of Herschel Island (Yukon, Canada) J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-01-19 Dirk Jong, Lisa Bröder, Tommaso Tesi, George Tanski, Mickolai Oudenhuijsen, Michael Fritz, Hugues Lantuit, Negar Haghipour, Timothy Eglinton, Jorien Vonk
Erosion of permafrost coasts due to climate warming releases large quantities of organic carbon (OC) into the Arctic Ocean. While burial of permafrost OC in marine sediments potentially limits degradation, resuspension of sediments in the nearshore zone potentially enhances degradation and greenhouse gas production, adding to the “permafrost carbon feedback.” Recent studies, focusing on bulk sediments
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Temporal Error Correlations in a Terrestrial Carbon Cycle Model Derived by Comparison to Carbon Dioxide Eddy Covariance Flux Tower Measurements J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-01-12 Daniel Wesloh, Klaus Keller, Sha Feng, Thomas Lauvaux, Kenneth J. Davis
Atmospheric CO2 flux inversions require as input an estimate of spatial and temporal correlations of errors in their estimate of the prior mean. Some previous studies have used the differences in CO2 daily average flux estimates produced by terrestrial carbon cycle models and eddy covariance measurements to constrain the flux error correlations. Since inversions are starting to resolve the daily cycle
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Hyperspectral and Photodiode Retrievals of Nighttime LED-Induced Chlorophyll Fluorescence (LEDIF) for Tracking Photosynthetic Phenology in a Vineyard J. Geophys. Res. Biogeosci. (IF 3.7) Pub Date : 2024-01-11 Christopher Y. S. Wong, Devin P. McHugh, Nicolas Bambach, Andrew J. McElrone, Maria Mar Alsina, William P. Kustas, Troy S. Magney
The magnitude of chlorophyll fluorescence emission represents both chlorophyll content and energy quenching processes enabling its application to serve as a proxy of photosynthetic activity. Thus, there is interest in advancing methods for canopy-scale monitoring of chlorophyll fluorescence. Remotely sensed solar-induced fluorescence (SIF) retrievals offer daytime monitoring of chlorophyll fluorescence