Near surface westerly wind jet in the Atlantic ITCZ
Near surface westerly wind jet in the Atlantic ITCZ
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DOI：
10.1029/2003gl017867
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发表时间：
2003-10-03
影响因子：
5.2
通讯作者：
Nigam, S
中科院分区：
文献类型：
--
作者：
Grodsky, SA;Carton, JA;Nigam, S
[1] 一套卫星数据用于研究大西洋热带辐合区西非季风高峰期（七月至九月）期间形成的近地表西风。这些新数据表明西风带以西风急流的形式出现。高峰年，每日近地表西风速度可能超过10毫秒(-1)。急流的振幅显示出巨大的年代际和年际变化，与西非萨赫勒地区的降雨量和非洲东风波的频率相对应。观测和海洋模型模拟表明，急流通过夹带和潜热损失来冷却海表温度，并通过增加向南的海洋压力梯度来加强北赤道逆流。
[1] A suite of satellite data are used to study the near surface westerly winds developing during peak months (July - September) of the West African monsoon in the Atlantic Intertropical Convergence Zone. These new data show that the westerlies appear in the form of a westerly jet. During peak years the daily near-surface westerly wind speed may exceed 10 ms(-1). The amplitude of the jet displays substantial decadal and interannual variability that corresponds to rainfall in the West African Sahel and the frequency of African Easterly Waves. Observations and ocean model simulations show that the jet acts to cool SST through entrainment and latent heat loss and to intensify the North Equatorial Countercurrent by increasing the southward oceanic pressure gradient.