Remote forcing of Indian Ocean warming on Northwest Pacific during El Niño decaying years: a FOAM model approach

被引:0
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作者
Haibo Hu
Xiaoyuan Hong
Yuan Zhang
Xiuqun Yang
Wei Liu
Huaguo Lu
Jianling Yang
机构
[1] Nanjing University,School of Atmospheric Sciences
[2] Chinese Academy of Sciences,Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology
[3] University of Chinese Academy of Sciences,School of Marine Sciences
[4] Nanjing University of Information Science and Technology,Scripps Institution of Oceanography
[5] University of California,School of Languages and Cultures
[6] Nanjing University of Information Science and Technology,Key Laboratory of Meteorological Disaster Preventing and Reducing in Ningxia
[7] Ningxia Meteorological Bureau,undefined
关键词
El Niño decaying year; Indian Ocean Basin warming (IOB warming); Indian Summer Monsoon (ISM); Fast Ocean-Atmosphere Model 1.5 (FOAM1.5); anomalous Northwest Pacific (NWP) anticyclone;
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摘要
This paper attempts to analyze in detail the remote influence of the Indian Ocean Basin warming on the Northwest Pacific (NWP) during the year of decaying El Niño. Observation data and the Fast Ocean-Atmosphere coupled Model 1.5 were used to investigate the triggering conditions under which the remote influence is formed between the positive sea surface temperature (SST) anomaly in the North Indian Ocean and the Anomalous Northwest Pacific anticyclone (ANWPA). Our research show that it is only when there is a contributory background wind field over the Indian Ocean, i.e., when the Indian Summer Monsoon (ISM) reaches its peak, that the warmer SST anomaly in the North Indian Ocean incites significant easterly wind anomalies in the lower atmosphere of the Indo-West tropical Pacific. This then produces the remote influence on the ANWPA. Therefore, the SST anomaly in the North Indian Ocean might interfere with the prediction of the East Asia Summer Monsoon in the year of decaying El Niño. Both the sustaining effect of local negative SST anomalies in the NWP, and the remote effect of positive SST anomalies in the North Indian Ocean on the ANWPA, should be considered in further research.
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页码:1375 / 1383
页数:8
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