Observation-based estimates of water mass transformation and formation in the Labrador Sea
编号:1163 访问权限:仅限参会人 更新:2025-01-05 10:03:06 浏览:200次 口头报告

报告开始:2025年01月15日 09:30(Asia/Shanghai)

报告时间:15min

所在会场:[S41] Session 41-The Atlantic Meridional Overturning Circulation Variability and Its Climatic Impacts [S41-1] The Atlantic Meridional Overturning Circulation Variability and its Climatic Impacts

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摘要
The water mass produced during wintertime convection in the Labrador Sea (i.e. the Labrador Sea Water or LSW) is characterized by distinct thermohaline properties. It has been shown to exert critical impact on the property and circulation fields of the North Atlantic. However, a quantitative understanding of the transformation and formation processes that produce LSW is still incomplete. Here we evaluate the mean water mass transformation and formation rates in the Labrador Sea, along with their forcing attributions, in both density and thermohaline coordinates using observation-based datasets during 2014–2019. We find that while surface buoyancy loss results in an expected densification of the basin and thus LSW formation, interior mixing has an indispensable and more complex impact.  In particular, mixing across density surfaces is estimated to account for 63% of the mean formation rate in the LSW layer (4.9 Sv) and does so by converting both upper layer and overflow layer waters into the LSW layer. In addition, mixing along density surfaces is shown to be responsible for the pronounced diathermohaline transformation (~ 10 Sv) west of Greenland. This is the primary process through which the cold and fresh LSW in the basin interior is exchanged with the warm and salty Irminger water in the boundary current. Results from this study underline the critical role of mixing (both across and along density surfaces) in determining the volume and properties of the LSW, with implications for better understanding and simulating deep water evolution under climate change.
 
关键词
water mass transformation, Labrador Sea, Atlantic Meridional Overturning Circulation
报告人
Sijia Zou
Dr. Xiamen University

稿件作者
Sijia Zou Xiamen University
Tillys Petit National Oceanography Centre
Feili Li Xiamen University
Susan Lozier Georgia Institute of Technology
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重要日期
  • 会议日期

    01月13日

    2025

    01月17日

    2025

  • 09月27日 2024

    初稿截稿日期

  • 01月17日 2025

    注册截止日期

主办单位
State Key Laboratory of Marine Environmental Science, Xiamen University
承办单位
State Key Laboratory of Marine Environmental Science, Xiamen University
Department of Earth Sciences, National Natural Science Foundation of China
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