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Meridional migration of Indian Ocean Monsoon precipitation during the early Holocene: Evidence from the Andaman Sea
Quaternary Science Reviews ( IF 4 ) Pub Date : 2021-07-29 , DOI: 10.1016/j.quascirev.2021.107102
Yiping Yang 1, 2 , Rong Xiang 1, 2 , Yun Huang 1, 2 , Shengfa Liu 3 , Jianguo Liu 1, 2 , Somkiat Khokiattiwong 4 , Narumol Kornkanitnan 4
Affiliation  

The Holocene evolution of the Indian Ocean Monsoon (IOM), especially the spatiotemporal nature of its maximum precipitation period, remains controversial. Here we reconstruct high-resolution local δ18Osw and sea surface temperature (SST) values by pairing Mg/Ca values and the δ18O data from planktonic foraminifera Globigerinoides ruber (white) in the southern Andaman Sea in order to understand IOM rainfall variability during the Holocene. Local δ18Osw values show that local maximum rainfall occurred between 10.6 ka and 8.6 ka in the southern Andaman Sea, before declining markedly during the 8.6–5.0 ka period, and then decreasing slightly after 5.0 ka. The Mg/Ca-SST was relatively low during the 10.3–8.6 ka period, before increasing slightly between 8.6 ka and 4.0 ka; it declined thereafter. But the sedimentation rate at the site of Core ADM-C1 relating to monsoonal precipitation of the source region of sediments exhibited its highest value during the 8.6–5.5 ka period. After making further comparisons with other published records for this region, we would propose that maximum IOM precipitation during the early Holocene has exhibited a clearly meridional migration: it was located in the tropics around 7°N during the 10.6–8.6 ka period, migrated northward to the subtropics during the 8.6–5.5 ka period, before migrating southward again after 5.0 ka. We would suggest that the northward shift of maximum precipitation during the Early Holocene in the IOM region was in response to the progressively northward migration of the Intertropical Convergence Zone (ITCZ) and the change of El Niño Southern Oscillation (ENSO) and Indian Ocean Dipole (IOD) activities.



中文翻译:

全新世早期印度洋季风降水的经向迁移:来自安达曼海的证据

印度洋季风 (IOM) 的全新世演化,尤其是其最大降水期的时空性质,仍存在争议。在这里,我们通过将 Mg/Ca 值和来自安达曼海南部浮游有孔虫Globigerinoides ruber(白色)的 δ 18 O 数据配对,重建高分辨率局部 δ 18 O sw和海面温度(SST)值,以了解 IOM 降雨全新世期间的变化。局部δ 18 O sw数值显示,当地最大降雨量出现在安达曼海南部的 10.6 至 8.6 ka 之间,然后在 8.6 至 5.0 ka 期间显着下降,然后在 5.0 ka 后略有下降。Mg/Ca-SST 在 10.3-8.6 ka 期间相对较低,然后在 8.6 ka 和 4.0 ka 之间略有增加;此后它拒绝了。但与沉积物源区季风降水相关的岩心ADM-C1位点的沉积速率在8.6-5.5 ka时期表现出最高值。在与该地区其他已发表的记录进行进一步比较后,我们认为全新世早期 IOM 的最大降水表现出明显的经向迁移:它在 10.6-8.6 ka 时期位于 7°N 附近的热带,向北迁移在 8.6-5 期间到亚热带。5 ka 时期,然后在 5.0 ka 之后再次向南迁移。我们认为,IOM 地区早全新世期间最大降水量的北移是对热带辐合带(ITCZ)逐渐向北迁移以及厄尔尼诺南方涛动(ENSO)和印度洋偶极子变化的响应。 IOD) 活动。

更新日期:2021-07-30
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