[口头报告]The response of sea ice and high salinity shelf water in the Ross Ice Shelf Polynya to cyclonic atmosphere circulations

The response of sea ice and high salinity shelf water in the Ross Ice Shelf Polynya to cyclonic atmosphere circulations
编号:2165 稿件编号:209 访问权限:私有 更新:2023-04-25 17:43:30 浏览:388次 口头报告

报告开始:2023年05月07日 13:27 (Asia/Shanghai)

报告时间:12min

所在会议:[18A] 18A、冰冻圈科学 » [18A-3] 18A-3 冰冻圈科学

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摘要
Coastal polynyas in the Ross Sea are important source regions of high salinity shelf water (HSSW) – the precursor of Antarctic Bottom Water that supplies the lower limb of the thermohaline circulation. Here, the response of sea ice production and HSSW formation to synoptic- and meso-scale cyclones was investigated for the Ross Ice Shelf Polynya (RISP) using a coupled ocean-sea ice-ice shelf model targeted on the Ross Sea. When synoptic-scale cyclones prevailed over RISP, sea ice production (SIP) increased rapidly by 20–30% over the entire RISP. During the passage of mesoscale cyclones, SIP increased by about 2 times over the western RISP but decreased over the eastern RISP, resulting respectively from enhancement in the offshore and onshore winds. HSSW formation mainly occurred in the western RISP and was enhanced responding to the SIP increase under both types of cyclones. Promoted HSSW formation could persist for 12–60 hours after the decay of the cyclones. The HSSW exports across the Drygalski Trough and the Glomar Challenger Trough were positively correlated with the meridional wind. Such correlations are mainly controlled by variations in geostrophic ocean currents that result from sea surface elevation change and density differences.
关键字
Coastal polynyas,Antarctic,Cyclones,Sea ice,High salinity shelf water
报告人
王小乔
上海交通大学

稿件作者
王小乔 上海交通大学海洋学院
张召儒 上海交通大学海洋学院
DinnimanMichael S. Old Dominion University
UotilaPetteri University of Helsinki
李熙晨 中国科学院大气物理研究所
ZhouMeng China; Shanghai Jiao Tong University; Shanghai
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