Physical Processes Associated with the Tropical Atlantic SST Gradient during the Anomalous Evolution in the Southeastern Ocean
Physical Processes Associated with the Tropical Atlantic SST Gradient during the Anomalous Evolution in the Southeastern Ocean
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DOI：
10.1175/jcli4189.1
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发表时间：
2007-07
影响因子：
4.9
通讯作者：
Zeng‐Zhen Hu;Bohua Huang
中科院分区：
文献类型：
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作者：
Zeng‐Zhen Hu;Bohua Huang
摘要本工作着重研究赤道和东南热带大西洋主导海气耦合模态的演变及其相关的物理过程。结果表明，在6 - 8月（JJA）的演变主要是动力驱动的，并显示出一致的变暖或冷却模式从安哥拉海岸向赤道在几内亚湾。对于在JJA达到峰值的异常，变暖（冷却）是在3 - 5月在安哥拉海岸附近开始的。结果表明，沿着海温异常与赤道附近海温异常存在物理联系。沿海岸沿着的海气相互作用可能是触发赤道附近SST异常发展的主要因素，而局部的正反馈（包括Bjerknes和Ekman过程）可能会加强这种作用。反过来，赤道附近的暖或冷通过改变异常风的方向而减弱了沿着SST的异常。向西缓慢传播的罗斯贝波也可能在...
Abstract This work is focused on the evolution of the dominant air–sea coupled mode in the equatorial and southeastern tropical Atlantic and the associated physical processes. It is shown that in June–August (JJA) the evolution of the dominant mode is mainly dynamically driven and displays a coherent warming or cooling pattern extending from the Angola coast toward the equator in the Gulf of Guinea. For anomalies peaking in JJA, the warming (cooling) is initiated near the Angola coast in March–May. It is suggested that SST anomalies along the coast and near the equator are physically connected. The air–sea interaction along the coast may be a major factor in triggering the development of SST anomalies near the equator, which is intensified by local positive feedbacks that may include Bjerknes and Ekman processes. In return, the warming or cooling near the equator weaken the SST anomalies along the coast by changing the direction of anomalous wind. Slow westward Rossby wave propagation may also play a role...