[口头报告]Hydrological cycling over Western Ross Sea driven by ENSO-SAM during the last 3,200 years

Hydrological cycling over Western Ross Sea driven by ENSO-SAM during the last 3,200 years
编号:2094 稿件编号:1931 访问权限:私有 更新:2023-04-11 09:27:32 浏览:316次 口头报告

报告开始:2023年05月07日 16:29 (Asia/Shanghai)

报告时间:12min

所在会议:[18B] 18B、冰冻圈科学 » [18B-1] 18B-1 冰冻圈科学

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摘要
Hydrological cycles in Antarctic ice-free regions are closely linked to changes of air temperature, precipitation (snow), evaporation and sea ice. However, paleo-hydrological records over longer timescales and driving mechanism remain elusive in the Ross Sea, East Antarctica. Two microbial mat depositional lacustrine sediment profiles (IIL3 and IIL9) were selected at Inexpressible Island, North Victoria Land, western Ross Sea. We present a new record of pond hydrological cycle using compound-specific hydrogen isotopes over the past 3,200 years. Here we show that the main drivers on the hydrogen isotope composition of lipids in photoautotrophic organisms are lake/pond salinity and water isotopes, which reflects regional evaporation strength. Our results, compared with many records at the studied site, indicate that the strength of evaporation is closely linked with summer air temperature with high salinity to warmer temperatures over the past 3,200 years. Similarities between our hydrological records, El Niño-Southern Oscillation (ENSO) and Southern Annual Mode (SAM) variability indicate that climate in the western Ross Sea is tele connected with the tropical Pacific Ocean. Specifically, during El Niño events, anomalous high-pressure was dominated near the Amundsen Sea, causing greater warm and moisture air transportation into western Ross Sea, vise during La Niña events. We conclude that natural variability in the tropical and sub-tropical played a crucial role in the changes of hydrological in the high latitude of Antarctica. 
关键字
East Antarctica; Compound-specific hydrogen isotopes; Evaporative process; Hydrological cycle; Atmosphere circulation
报告人
ChenXin
School of Oceanography, Shanghai Jiao Tong University, 1954 Huashan Rd., Shanghai 200030, China;School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China xinchen1991@sjtu.edu.cn

稿件作者
ChenXin School of Oceanography, Shanghai Jiao Tong University, 1954 Huashan Rd., Shanghai 200030, China;School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China xinchen1991@sjtu.edu.cn
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