Physical Oceanography Laboratory/CIMST, Ocean University of China and Qingdao National Laboratory for Marine Science and Technology, Qingdao, P. R. China.
State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, P. R. China.
Science. 2020 May 29;368(6494):988-993. doi: 10.1126/science.aax5758.
A positive feedback mechanism between tropical cyclones (TCs) and climate warming can be seen by examining TC-induced energy and potential vorticity (PV) changes of oceanic geostrophic eddies. We found that substantial dissipation of eddies, with a strong bias toward dissipation of anticyclonic eddies, is directly linked to TC activity. East of Taiwan, where TCs show a remarkable intensifying trend in recent decades, the ocean exhibits a corresponding upward trend of positive PV anomalies. Carried westward by eddies, increasing numbers of positive PV anomalies impinge on the Kuroshio current, causing the mean current to accelerate downstream. This acts in opposition to decreasing basin-scale wind stress and has a potentially important warming impact on the extratropical ocean and climate.
通过研究热带气旋（TCs）引起的海洋地转涡动能量和位涡（PV）变化，可以看到 TCs 和气候变暖之间的正反馈机制。我们发现，涡旋的大量耗散，特别是反气旋涡旋的强烈耗散，与 TC 活动直接相关。在台湾东部，TCs 在最近几十年表现出显著的增强趋势，海洋表现出正 PV 异常的相应上升趋势。正 PV 异常通过涡旋向西传播，越来越多的正 PV 异常冲击黑潮，导致平均流加速下游。这与流域尺度风应力的减少相反，对温带海洋和气候具有潜在的重要变暖影响。
