Physical Processes Associated with the Tropical Atlantic SST Meridional Gradient
Physical Processes Associated with the Tropical Atlantic SST Meridional Gradient
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DOI：
10.1175/jcli3923.1
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发表时间：
2006-11
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
摘要利用再分析资料研究了大西洋季节海温经向梯度的主要模态及其与部分区域平均海温指数的关系。研究的重点是北方春季经向海温梯度主导模态的演变及其相关的物理过程。北方春季主导模态的空间分布呈跷跷板型，反映了北大西洋副热带和热带经向海温梯度的相反变化，这是由沿10°-15°N的连续增温或降温引起的。证实该模态以风-蒸发-海温反馈为主。这种反馈在大西洋西部比在大西洋东部持续的时间更长。对海温变化的贡献主要来自潜热通量。地表长波和短波云辐射强迫主要由低层云量变化决定。作者还发现，热动力…
Abstract The major modes of seasonal sea surface temperature (SST) meridional gradient and their connection with some regional mean SST indices in the Atlantic Ocean are examined using reanalysis data. The focus of the work is on the evolution of the dominant mode of the meridional SST gradient in boreal spring and the associated physical processes. The spatial distribution of the dominant mode in boreal spring is a seesaw pattern, reflecting the opposite variation of the meridional SST gradient between the subtropical and tropical North Atlantic, which resulted from a coherent warming or cooling with maxima along 10°–15°N. It is confirmed that this mode is dominated by the wind–evaporation–SST feedback. The feedback persists a longer time in the western Atlantic than in the eastern. The contribution to the SST variation is mainly from latent heat flux. The surface longwave and shortwave cloud radiative forcings are mainly determined by low cloud cover variations. The authors also found that the thermodyn...