The Ocean Memory in the Pacific modulated by the Atlantic Multidecadal Oscillation


发布日期:2024-04-25 阅读:285

报告人:吴宝兰 博士 香港科技大学

邀请人:王云涛 研究员

时    间:4月29日(周一)10:00-11:30

地    点:1号楼1210会议室


召集人:王云涛 研究员



报告人:吴宝兰 博士(香港科技大学)

报告题目:The Ocean Memory in the Pacific modulated by the Atlantic Multidecadal Oscillation

报告人简介:吴宝兰,香港科技大学博士后,中国海洋大学海洋与大气学院物理海洋学2017级博士,于2018-2020年在美国伍兹霍尔海洋研究所(WHOI)访学。主要研究方向为大尺度海洋环流动力学及海洋年代际变化,关注北太平洋副热带模态水及其相关的海洋锋面变化,它们在海洋-大气相互作用中的角色及生态效应,以及进一步改善年代际气候预测。以第一作者身份在国际期刊Nature Climate Change,Journal of Physical Oceanography,Journal of Climate,Geophysical Research Letters和Journal of Geophysical Research 等发表论文10篇。入选2021年博士后创新人才支持计划(当年物理海洋学科唯一入选者),2022年获得国家自然科学基金项目-青年科学基金资助。现任联合国“海洋十年”青年科学家(ECOP)大科学计划中国国家代表,联合国“海洋十年”大科学计划——“第二次黑潮及周边海域国际合作研究”(CSK-2)青年科学家代表,同时担任多个国际主流学术期刊审稿人。

报告摘要:The ocean is believed to sustain the low frequency climate change through its huge heat content or the “ocean memory”, which is usually saved in the subsurface ocean water mass such as the North Pacific Subtropical Mode Water (STMW). Traditionally, the decadal variability of the mode water has been attributed to the Pacific Decadal Oscillation (PDO). In this talk, I will show that the decadal to multi-decadal variability of STMW is controlled by the Atlantic Multi-Decadal Oscillation (AMO). During an AMO positive phase, the subtropical North Pacific westerlies move northward and induce the poleward shift of the Kuroshio-Oyashio (KOE) front. 

This will result in the decrease of STMW with warmer temperature, and further influence the Northwestern Pacific upper-ocean heat content and fish catches. The above decadal decrease of STMW will be carried by the thermocline circulation and arrive at the subtropical western Pacific Ocean after ~5 years, causing the decreasing of the sea level and subtropical front/countercurrents to the east of Luzon Strait and moreover affecting the Kuroshio and its interaction with the South China Sea in the Luzon Strait. 

More interestingly, these temperature anomalies carried by the STMW would eventually re-join the KOE region after one decade later. Once reemerged in the surface ocean, the anomalies that carry the memory of the previous decade may engage with local air-sea feedback to trigger the PDO. Overall, the AMO provides important memory for the climate change in the Pacific Ocean.

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