Coherent surface‐subsurface fingerprint of the Atlantic meridional overturning circulation
Coherent surface‐subsurface fingerprint of the Atlantic meridional overturning circulation
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DOI：
10.1029/2008gl035463
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发表时间：
2008-10
影响因子：
5.2
通讯作者：
Rong‐Hua Zhang
中科院分区：
文献类型：
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作者：
Rong‐Hua Zhang
卫星高度计数据显示，20世纪90年代北大西洋副极地环流减弱，这被认为是大西洋纬向翻转环流（AMOC）减缓的一个指标。然而，最近减缓的副极地环流是一个十年变化还是一个长期趋势仍然不清楚。在这里，我表明，高度计数据是高度相关的仪器次表层海洋温度数据在北大西洋，都显示出相反的迹象之间的副极地环流和墨西哥湾流路径这样的偶极子模式是一个独特的指纹AMOC变化，第一次显示了1000年的耦合海洋-大气模式模拟。结果表明，与以前的解释相反，最近的副极地环流的放缓是一个几十年变化的一部分，并建议加强AMOC。正在进行的卫星和地下温度测量可用于敏感地监测未来的AMOC变化。
Satellite altimeter data shows a weakening of the North Atlantic subpolar gyre during the 1990s, which is thought as an indicator of a slowdown of the Atlantic meridional overturning circulation (AMOC). However, whether the recent slowing subpolar gyre is a decadal variation or a long‐term trend remains unclear. Here I show that altimeter data is highly correlated with instrumental subsurface ocean temperature data in the North Atlantic, and both show opposite signs between the subpolar gyre and the Gulf Stream path. Such a dipole pattern is a distinctive fingerprint of AMOC variability, as shown for the first time by a 1000‐year coupled ocean‐atmosphere model simulation. The results suggest that, contrary to previous interpretations, the recent slowdown of the subpolar gyre is a part of a multidecadal variation and suggests a strengthening of the AMOC. The ongoing satellite and subsurface temperature measurements could be used to monitor future AMOC variations sensitively.