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《Chinese Journal of Atmospheric Sciences》 2017-03
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A Mechanism Study for the Intraseasonal Oscillation Impact on the Two Northward Jumps of the Western Pacific Subtropical High

SU Tonghua;XUE Feng;CHEN Minyan;DONG Xiao;Fujian Meteorological Observatory;International Center for Climate and Environment Sciences, Institute of Atmospheric Physics, Chinese Academy of Sciences;  
During summertime, the WPSH(western Pacific subtropical high) exhibits two northward jumps. The first jump signals the termination of pre-flood period in southern China and the start of the Meiyu over the Yangtze–Huaihe River valley; the second jump indicates the termination of the Meiyu and the start of rainy season in northern China. Based on the fast Fourier transformation and composite analysis of observational and reanalysis data, the authors investigated the impact of the intraseasonal oscillations(ISOs) on various time-scales on the northward jumps in the normal and abnormal years. The dominant periods of the ISOs are different in normal and abnormal years, i.e. 10–20 days and quasi-60 days in normal years, 30–60 days in abnormal years of the first jump and earlier years of the second jump, 10–20 days and 30–60 days in later years of the second jump. During the annual cycle, the ISOs tend to propagate northward in the East Asian–tropical northwestern Pacific region, leading to the northward jump of the WPSH. With the northeastward propagation of the ISOs over the Indian monsoon region, a more remarkable first jump is observed due to the eastward extension of the westerly. By contrast, the biweekly oscillation of the warm pool convection triggered by the cold air invasion from the Australian high plays an important role in a more evident second jump during the normal and later years. The sea surface temperature anomaly over the northwestern Indian Ocean in the preceding spring leads to the phase migration of local ISOs and associated abnormal first jump. Besides, the time-scale and amplitude of the ISOs in the warm pool can be regulated by ENSO, resulting in the abnormal second jump.
【Fund】: 国家自然科学基金项目41405056、41475052;; 福建省自然科学基金青年创新项目2015J05078;; 华东区域气象科技协同创新基金合作项目QYHZ201405~~
【CateGory Index】: P424
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【Citations】
Chinese Journal Full-text Database 4 Hits
1 SU Tong-Hua1,2 and XUE Feng1 1 International Center for Climate and Environment Sciences, Institute of Atmospheric Physics, Chinese Academy of Sciences, Bei-jing 100029, China 2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China;Two Northward Jumps of the Summertime Western Pacific Subtropical High and Their Associations with the Tropical SST Anomalies[J];Atmospheric and Oceanic Science Letters;2011-02
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【Co-citations】
Chinese Journal Full-text Database 10 Hits
1 SU Tonghua;XUE Feng;CHEN Minyan;DONG Xiao;Fujian Meteorological Observatory;International Center for Climate and Environment Sciences, Institute of Atmospheric Physics, Chinese Academy of Sciences;;A Mechanism Study for the Intraseasonal Oscillation Impact on the Two Northward Jumps of the Western Pacific Subtropical High[J];大气科学;2017-03
2 XUE Feng;ZHAO Jun-Jie;International Center for Climate and Environment Sciences(ICCES),Institute of Atmospheric Physics,Chinese Academy of Sciences;Meteorological Training Center of Shanxi Province;;Intraseasonal variation of the East Asian summer monsoon in La Ni?a years[J];Atmospheric and Oceanic Science Letters;2017-02
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4 Zhang Yizhi;Ma Fengmin;Jiangxi Climate Center;;Analysis on Low-frequency Circulation Characteristics of Typical Drought and Flood Years for Jiangxi Flood Season[J];气象与减灾研究;2016-04
5 GUO Dong;WANG Linwei;LI Zhenkun;SU Yuchen;QIN Hao;HUANG Ying;Key Laboratory of Meteorological Disaster,Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environment Change(IL-CEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD) ,Nanjing University of Information Science & Technology;Shanghai Public Meteorological Service Center;Shanghai Climate Center;;Comparison between anomalies of summer rainfall in China in decaying years during super El Nio events of 2015/2016 and 1997/1998[J];大气科学学报;2016-06
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