LTO国家重点实验室学术报告(2020-30):
报告1:A stable Atlantic Meridional Overturning Circulation in a changing North Atlantic Ocean since the 1990s
报告人:付垚,博士,毕业于德国基尔大学/亥姆霍兹海洋研究中心,主要从事大尺度海洋环流及其气候效应研究,研究内容包括大西洋经向翻转流,副热带经圈环流及水团特性等。最新代表性成果发表在《Science Advances》上,该研究通过观测手段表明大西洋经向翻转流在过去三十年趋于稳定,并首次提出北大西洋水文特性与翻转流强度并非同步变化。
报告简介:The Atlantic Meridional Overturning Circulation (AMOC) is crucially important to global climate. Model simulations suggest that the AMOC may have been weakening over decades. However, existing array-based AMOC observations are not long enough to capture multidecadal changes. Here, we use repeated hydrographic sections in the subtropical and subpolar North Atlantic, combined with an inverse model constrained using satellite altimetry, to jointly analyze AMOC and hydrographic changes over the past three decades. We show that the AMOC state in the past decade is not distinctly different from that in the 1990s in the North Atlantic, with a remarkably stable partition of the subpolar overturning occurring prominently in the eastern basins rather than in the Labrador Sea. In contrast, profound hydrographic and oxygen changes, particularly in the subpolar North Atlantic, are observed over the same period, suggesting a much higher decoupling between the AMOC and ocean interior property fields than previously thought.
报告2:马达加斯加内潮模拟及其能量收支分析
报告人:张华 ,2020级博士研究生,主要研究方向为内潮潮致混合与潮致耗散。
报告简介:马达加斯加海区作为全球海洋潮能耗散最强的海区之一。本研究利用高分辨率的海洋数值模式对该海区进行内潮模拟,并对该海区的内潮生成、传播、耗散特征进行分析。研究结果表明, 马达加斯加内潮主要在马达加斯加岛北端法夸尔群岛,南端圣玛丽角附近生成,并向东向西传播至莫桑比克海峡到达周围大陆坡,向东传播的内潮到达了西南印度洋。马达加斯加岛北端法夸尔群岛(南端圣玛丽角)的内潮转化率为10.36GW(4.91GW),其中 1/3 (1/2) 的能量局地耗散,部分能量向东西方向传播;莫桑比克海峡的能量耗散大于内潮转化率,表明莫桑比克海峡的能量耗散约1/2是南北端内潮源区传播而来的非局地内潮。基于内潮能量收支方程,同时考虑局地产生和非局地传播内潮的影响,比单一考虑局地内潮影响的LSJ02方案估算的内潮耗散率和潮致扩散率强1-2个量级。
主 持 人:王素芬 副研究员、李少钿 助理研究员
报告形式:线下、线上报告
会议时间:2020年12月10日(周四)上午09:00
腾讯会议ID:725 1170 7545
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