High latitude regions across the globe are undergoing severe modifications due to changing climate. A high latitude region of concern is the Gulf of Alaska (GoA), where these changes in hydroclimate undoubtedly affect the hydrogeochemistry of freshwater discharging to the nearshore ecosystems of the region. To fill the knowledge gap of our understanding of freshwater stream geochemistry with the GoA, we compile stream water chemistry data from 162 stream sites across the region. With an inverse model, we estimate fractional contributions to solute fluxes from weathering of silicate, carbonate, and sulfide minerals, and precipitation. We assess weathering rates across the region and compare them against global river yields. The median fractional contribution of carbonate weathering to total weathering products is 78% across all stream sites; however, there are several streams where silicate weathering is a dominant source of solutes. Weathering by sulfuric acid is elevated in glacierized watersheds. Finally, cation weathering rates are lower in GoA streams compared to the world's largest rivers; however, weathering rates are similar when compared to a global dataset of glacier fed streams. We suggest that hydrologic changes driven by glacier ice loss and increased precipitation will alter river water quality and chemical weathering regimes such that silicate weathering may become a more important source of solutes and sulfide oxidation may decrease. This contribution provides a platform to build from for future investigations into changes to stream water chemistry in the region and other high latitude watersheds.

中文翻译：

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阿拉斯加湾高纬度流域的地球化学风化变化

由于气候变化，全球高纬度地区正在经历严重的变化。值得关注的高纬度地区是阿拉斯加湾 (GoA)，该地区水文气候的变化无疑会影响该地区近岸生态系统的淡水排放的水文地球化学。为了填补阿富汗政府对淡水河流地球化学理解的知识空白，我们汇编了该地区 162 个河流地点的河流水化学数据。通过反演模型，我们估计了硅酸盐、碳酸盐和硫化物矿物的风化以及降水对溶质通量的贡献。我们评估该地区的风化率，并将其与全球河流产量进行比较。在所有河流地点，碳酸盐风化对总风化产物的贡献中位数为 78%；然而，有几条溪流的硅酸盐风化是溶质的主要来源。在冰川化的流域中，硫酸的风化作用加剧。最后，与世界上最大的河流相比，果阿溪流的阳离子风化率较低；然而，与冰川注入的全球数据集相比，风化率相似。我们认为，由冰川冰损失和降水增加驱动的水文变化将改变河流水质和化学风化状况，使得硅酸盐风化可能成为更重要的溶质来源，硫化物氧化可能会减少。这一贡献为未来调查该地区和其他高纬度流域河流水化学变化提供了一个平台。