The Indian Ocean’s asymmetric effect on the coupling of the Northwest Pacific SST and anticyclone anomalies during its spring–summer transition after El Niño
The Indian Ocean’s asymmetric effect on the coupling of the Northwest Pacific SST and anticyclone anomalies during its spring–summer transition after El Niño
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DOI：
10.1007/s10872-011-0039-y
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发表时间：
2011-06
影响因子：
2.3
通讯作者：
Haibo Hu;Jie He;Qigang Wu;Y. Zhang
中科院分区：
文献类型：
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作者：
Haibo Hu;Jie He;Qigang Wu;Y. Zhang
通过比较厄尔尼诺衰减夏季不同气候条件下印度洋海盆（IOB）增暖的存在，研究了IOB增暖对西北太平洋海温异常的影响及其与海面风场的耦合过程。西北太平洋东西两侧纬向非对称耦合反馈是由背景热带大气环流的非对称春夏转换引起的。虽然IOB变暖的遥效应导致的向西异常在整个西北太平洋都存在，但在西部平均背景风的逆转导致负的风蒸发SST（WES），而在东部持续的信风导致正的WES。这种纬向不对称的海温演变所产生的东西向海温梯度，产生了更多的正反馈，加强了局地反气旋东风异常。
By comparing different climatologies in El Niño decaying summer with regard to the presence of Indian Ocean Basin (IOB) warming, we studied the effect of IOB warming on the Northwest Pacific sea surface temperature (SST) anomalies and the coupling process with the surface wind. Zonal asymmetric coupling feedback in the west and east of the Northwest Pacific were caused by the asymmetric spring–summer transition of the background tropical atmospheric circulation. Although the westward wind anomaly caused by the remote effect of IOB warming is found in the whole Northwest Pacific, reversal of the mean background surface winds in the western part leads to negative wind-evaporation SST (WES), whereas sustained trade winds lead to positive WES in the eastern part. The east–west SST gradient resulting from this zonal asymmetric evolution of SST sets off more positive feedback that strengthens the local anticyclone easterly anomalies.