Ocean warming and accelerating Southern Ocean zonal flow
Ocean warming and accelerating Southern Ocean zonal flow
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DOI：
10.1038/s41558-021-01212-5
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发表时间：
2021-11
影响因子：
30.7
通讯作者：
Jia‐Rui Shi;L. Talley;S. Xie;Qihua Peng;Wei Liu
中科院分区：
文献类型：
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作者：
Jia‐Rui Shi;L. Talley;S. Xie;Qihua Peng;Wei Liu
南大洋（>30° S）吸收了南极绕极流（ACC）亚南极锋（SAF）以北的大量人为热量。20世纪90年代之前的采样不足和年代际变化掩盖了海洋对这种变暖的动态反应。在这里，我们使用加长的卫星测高和Argo浮标记录，以显示在48° S-58° S的纬向平均南大洋纬向流的强劲加速。这种加速在一系列气候模式中重现，包括海洋涡旋解析模式。人为海洋变暖是主要的驱动因素，因为SAF北部（南部）的下降流（上升流）制度中的大（小）热量增加导致ACC和邻近副热带北方侧翼的纬向加速，这是由于斜压性增加;加强风应力是次要的。在德雷克海峡，几乎没有变暖发生，SAF的速度基本保持不变。持续的海洋变暖可能会进一步加速南大洋的纬向流。
The Southern Ocean (>30° S) has taken up a large amount of anthropogenic heat north of the Subantarctic Front (SAF) of the Antarctic Circumpolar Current (ACC). Poor sampling before the 1990s and decadal variability have heretofore masked the ocean’s dynamic response to this warming. Here we use the lengthening satellite altimetry and Argo float records to show robust acceleration of zonally averaged Southern Ocean zonal flow at 48° S–58° S. This acceleration is reproduced in a hierarchy of climate models, including an ocean-eddy-resolving model. Anthropogenic ocean warming is the dominant driver, as large (small) heat gain in the downwelling (upwelling) regime north (south) of the SAF causes zonal acceleration on the northern flank of the ACC and adjacent subtropics due to increased baroclinicity; strengthened wind stress is of secondary importance. In Drake Passage, little warming occurs and the SAF velocity remains largely unchanged. Continued ocean warming could further accelerate Southern Ocean zonal flow.