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Variation in Principal Modes of Midsummer Precipitation over Northeast China and Its Associated Atmospheric Circulation 预览
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作者 Tingting HAN Shengping HE +1 位作者 Huijun WANG Xin HAO 《大气科学进展:英文版》 SCIE CAS CSCD 2019年第1期55-64,共10页
关键词 发行量 降水 大气 中国 东北 NEC 调查结果 垂直运动
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Two interannual variability modes of the Northwestern Pacific Subtropical Anticyclone in boreal summer
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作者 HE Chao ZHOU TianJun +1 位作者 ZOU LiWei ZHANG LiXia 《中国科学:地球科学英文版》 SCIE EI CAS 2013年第7期1254-1265,共12页
Using the reanalysis data and 20th century simulation of coupled model FGOALS_gl developed by LASG/IAP, we identified two distinct interannual modes of Northwestern Pacific Subtropical Anticyclone (NWPAC) by performin... Using the reanalysis data and 20th century simulation of coupled model FGOALS_gl developed by LASG/IAP, we identified two distinct interannual modes of Northwestern Pacific Subtropical Anticyclone (NWPAC) by performing Empirical Orthogonal Function (EOF) analysis on 850 hPa wind field over the northwestern Pacific in summer. Based on the associated anomalous equatorial zonal wind, these two modes are termed as 'Equatorial Easterly related Mode' (EEM) and 'Equatorial Westerly related Mode' (EWM), respectively. The formation mechanisms of these two modes are similar, whereas the maintenance mechanisms, dominant periods, and the relationships with ENSO are different. The EEM is associated with El Ni o decaying phase, with the anomalous anticyclone established in the preceding winter and persisted into summer through local positive air-sea feedback. By enhancing equatorial upwelling of subsurface cold water, EEM favors the transition of ENSO from El Ni o to La Ni a. The EWM is accompanied by the El Ni o events with long persistence, with the anomalous anticyclone formed in spring and strengthened in summer due to the warm Sea Surface Temperature anomalies (SSTA) forcing from the equatorial central-eastern Pacific. The model well reproduces the spatial patterns of these two modes, but fails to simulate the percentage variance accounted for by the two modes. In the NCEP reanalysis (model result), EEM (EWM) appears as the firstmode, which accounts for 35.6% (68.2%) of the total variance. 展开更多
关键词 西北太平洋副热带高压 年际变化 夏季 北半球 赤道西风 经验正交函数 环流异常 维持机制
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