Synchronous intensification and warming of Antarctic Bottom Water outflow from the Weddell Gyre
Synchronous intensification and warming of Antarctic Bottom Water outflow from the Weddell Gyre
复制标题
威德尔环流南极底层水流出的同步增强和变暖
DOI：
10.1029/2010gl046265
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发表时间：
2011
影响因子：
5.2
通讯作者：
H. Venables
中科院分区：
文献类型：
--
作者：
M. Meredith;A. Gordon;A. N. Naveira Garabato;E. Abrahamsen;B. Huber;L. Jullion;H. Venables
南极底层水（AABW）是全球翻转环流中的底层水，近几十年来已经变暖，最明显的是在大西洋。记录的时间序列内的边界电流的上游和下游的最显着流出的AABW从威德尔海表明，提高流出温度是同步的更强的边界电流。这些变化发生迅速响应风强迫的变化，这表明正压动力学和底部Ekman层的响应是显着的。观察到的同步性表明，先前检测到的来自威德尔海的较冷形式的AABW输出的减弱不一定与通过这条路线输出的AABW总通量的减少有关。在归因于大西洋观测到的AABW变暖时，以及在确定其对全球热量收支和海平面上升的贡献时，需要仔细考虑这些问题。
Antarctic Bottom Water (AABW), the densest water in the global overturning circulation, has warmed in recent decades, most notably in the Atlantic. Time series recorded within the boundary currents immediately upstream and downstream of the most significant outflow of AABW from the Weddell Sea indicate that raised outflow temperatures are synchronous with stronger boundary current flows. These changes occur rapidly in response to changes in wind forcing, suggesting that barotropic dynamics and the response of the bottom Ekman layer are significant. The observed synchronicity indicates that the previously‐detected weakening of the export of the colder forms of AABW from the Weddell Sea need not be associated with a reduction in the total flux of AABW exported via this route. These points need careful consideration when attributing the observed AABW warming in the Atlantic, and when determining its contribution to global heat budgets and sea level rise.