Role of Western Pacific Oceanic variability in the onset of the Bay of Bengal summer monsoon

Role of Western Pacific Oceanic variability in the onset of the Bay of Bengal summer monsoon
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西太平洋海洋变化对孟加拉湾夏季风爆发的作用

DOI:
10.1007/s00376-012-2040-9
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发表时间:
2013-01
影响因子:
5.8
通讯作者:
Yu Lejiang
Yu Lejiang
中科院分区:
地球科学2区
文献类型:
--
作者:
Feng Junqiao;Hu Dunxin;Yu Lejiang

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利用NCEP的大气资料和日本气象厅(JMA)的海洋次表层温度资料,研究了热带印度洋-太平洋热含量对孟加拉湾夏季风爆发的影响。结果表明,前冬春季BOBSM爆发的时间与热带太平洋上层海洋热含量(HC),特别是西太平洋暖池关键区(WPWP)的HC密切相关。当WPWP中的HC异常为正(负)时,BOBSM的发作通常是早(晚)的。伴随着主要由下垫面海温异常引起的西太平洋太平洋对流活动的变化,步行者环流有增强或减弱的趋势。这增强或减弱了在北半球春季流入BOB的热带印度洋西风,这对BOBSM的爆发至关重要。文中还讨论了热带西北太平洋气旋性/反气旋性环流影响BOBSM爆发的可能机制。
The influence of the tropical Indo-Pacific Ocean heat content on the onset of the Bay of Bengal summer monsoon (BOBSM) onset was investigated using atmospheric data from the NCEP and ocean subsurface temperature data from the Japan Metorology Agency (JMA). Results showed that the onset time of the BOBSM is highly related to the tropical Pacific upper ocean heat content (HC), especially in the key region of the western Pacific warm pool (WPWP), during the preceding winter and spring. When the HC anomalies in the WPWP are positive (negative), the onset of the BOBSM is usually early (late). Accompanied by the variation of the convection activity over the WPWP, mainly induced by the underlying ocean temperature anomalies, the Walker circulation becomes stronger or weaker. This enhances or weakens the westerly over the tropical Indian Ocean flowing into the BOB in the boreal spring, which is essential to BOBSM onset. The possible mechanism of influence of cyclonic/anti-cyclonic circulation over the northwestern tropical Pacific on BOBSM onset is also discussed.
DOI: 10.1002/cjg2.940
发表时间: 2006-09
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