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Water Vapor Transport and cross-equatorial flow over the Asian-Australia Monsoon Region Simulated by CMIP5 Climate Models

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Advances in Atmospheric Sciences 2013年第3期30卷 726-738页

作者：宋亚娟乔方利宋振亚姜春飞 College of Physical and Environmental Oceanography Ocean University of China First Institute of Oceanography State Oceanic Administration

The summer mean water vapor transport （WVT） and cross-equatorial flow （CEF） over the Asian- Australian monsoon region simulated by 22 coupled atmospheric-oceanic general circulation models （AOGCMs） from the World Climate Research Programme＇s Coupled Model Intercomparison Project Phase 5 （CMIP5） were evaluated. Based on climatology of the twentieth-century simulations, most of models have a reason- ably realistic representation of summer monsoon WVT characterized by southeast water vapor conveyor belt over the South Indian Ocean and southwest belt from the Arabian Sea to the East Asian. The correlation coefficients between NCEP reanalysis and simulations of BCC-CSMI-1, BNU-ESM, CanESM2, FGOALS-s2, MIROC4h and MPI-ESM-LR are up to 0.8. The simulated CEF depicted by the meridional wind along the equator includes the Somali jet and eastern CEF in low atmosphere and the reverse circulation in upper atmosphere, which were generally consistent with NCEP reanalysis. Multi-model ensemble means （MME） can reproduce more reasonable climatological features in spatial distribution both of WVT and CEF. Ten models with more reasonable WVT simulations were selected for future projection studies, including BCC- CSMI-1, BNU-ESM, CanESM2, CCSM4, FGOALS-s2, FIO-ESM, GFDL-ESM2G, MRIOCS, MPI-ESM-LR and NorESM-1M. Analysis based on the future projection experiments in RCP （Representative Concentra- tion Pathway） 2.6, RCP4.5, RCP6 and RCP8.5 show that the global warming forced by different RCP scenarios will results in enhanced WVT over the Indian area and the west Pacific and weaken WVT in the low latitudes of tropical Indian Ocean.

关键词： CMIP5 AOGCMs water vapor transport cross-equatorial flow future projection

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Variations of the Summer Somali and Australia cross-equatorial flows and the Implications for the Asian Summer Monsoon

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Advances in Atmospheric Sciences 2012年第3期29卷 509-518页

作者：祝亚丽 Nansen-Zhu International Research Centre Institute of Atmospheric PhysicsChinese Academy of Sciences Climate Change Research Center Chinese Academy of Sciences

The temporal variations during 1948-2010 and vertical structures of the summer Somali and Australia cross-equatorial flows （CEFs） and the implications for the Asian summer monsoon were explored in this study. The strongest southerly and northerly CEFs exist at 925 hPa and 150 hPa level, respectively. The low-level Somali （LLS） CEFs were significantly connected with the rainfall in most regions of India （especially the monsoon regions）, except in a small area in southwest India. In comparison to the climatology, the low- level Australia （LLA） CEFs exhibited stronger variations at interannual time scale and are more closely connected to the East Asian summer monsoon circulation than to the LLS CEFs. The East Asian summer monsoon circulation anomalies related to stronger LLA CEFs were associ- ated with less water vapor content and less rainfall in the region between the middle Yellow River and Yangtze River and with more water vapor and more rainfall in southern China. The sea-surface tempera- ture anomalies east of Australia related to summer LLA CEFs emerge in spring and persist into summer, with implications for the seasonal prediction of summer rainfall in East Asia. The connection between the LLA CEFs and East Asian summer monsoon rainfall may be partly due to its linkage with E1 Nino-Southern Oscillation. In addition, both the LLA and LLS CEFs .exhibited interdecadal shifts in the late 1970s and the late 1990s, consistent with the phase shifts of Pacific Decadal Oscillation （PDO）.

关键词： cross-equatorial flow Asian summer monsoon low-level jet Somali

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Modulation of Low-Latitude West Wind on Abnormal Track and Intensity of Tropical Cyclone Nargis (2008) in the Bay of Bengal

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Advances in Atmospheric Sciences 2012年第2期29卷 407-421页

作者：李维维王春在王东晓杨磊邓奕 State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of ScienceGuangzhou 510301 NOAA/Atlantic Oceanographic and Meteorological Laboratory MiamiFloridaUSA

Tropical cyclone （TC） Nargis （2008） made landfall in Myanmar on 02 May 2008, bringing a storm surge, major flooding, and resulting in a significant death toll. TC Nargis （2008） displayed abnormal features, including rare eastward motion in its late stage, rapid intensification before landing. Using reanalysis data and a numerical model, we investigated how a low-latitude westerly wind modulated TC Nargis’ （2008） track and provided favorable atmospheric conditions for its rapid intensification. More importantly, we found a possible counterbalance effect of flows from the two hemispheres on the TC track in the Bay of Bengal. Our analysis indicates that a strong westerly wind burst across the Bay of Bengal, resulting in TC Nargis’ （2008） eastward movement after its recurvature. This sudden enhancement of westerly wind was mainly due to the rapidly intensified mid-level cross-equatorial flow. Our results show that a high-pressure system in the Southern Hemisphere induced this strong, mid-level, cross-equatorial flow. During the rapid intensification period of TC Nargis （2008）, this strong and broad westerly wind also transported a large amount of water vapor to TC Nargis （2008）. Sufficient water vapor gave rise to continuously high and increased mid-level relative humidity, which was favorable to TC Nargis’ （2008） intensification. Condensation of water vapor increased the energy supply, which eventuated the intensification of TC Nargis （2008） to a category 4 on the Saffir-Simpson scale.

关键词： TC Nargis （2008） tropical cyclone westerly wind cross-equatorial flow Bay of Bengal

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INFLUENCE OF THE INTERANNUAL VARIATION OF crossequatorial flow ON TROPICAL CYCLOGENESIS OVER THE WESTERN NORTH PACIFIC

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Journal of Tropical Meteorology 2017年第1期23卷 68-80页

作者：冯涛沈新勇黄荣辉陈光华 Key Laboratory of Meteorological Disaster Ministry of Education/Joint International Research Laboratory of Climate and Environment Change Collaborative Innovation Center on Forecast and Evaluation of Meteorological DisastersNanjing University of Information Science and Technology Center for Monsoon System Research Institute of Atmospheric PhysicsChinese Academy of Sciences

The influence of the interannual variation of cross-equatorial flow(CEF) on tropical cyclogenesis over the western North Pacific(WNP) is examined in this paper by using the tropical cyclone(TC) best track data from the Joint Typhoon Warning Center and the JRA-25 reanalysis dataset. The results showed that the number of TCs forming to the east of 140°E over the southeastern part of the western North Pacific(WNP) is in highly positive correlation with the variation of the CEF near 125° E and 150° E, i.e., the number of tropical cyclogeneses increases when the cross-equatorial flows are strong. Composite analyses showed that during the years of strong CEF, the variations of OLR, vertical wind shear between 200-850 h Pa, 850 h Pa relative vorticity and 200 h Pa divergence are favorable for tropical cyclogenesis to the east of 140°E over the tropical WNP, and vice versa. Moreover, it is also discussed from the view of barotropic energy conversion that during the years of strong CEF, an eastward-extended monsoon trough leads to the rapid growth of eddy kinetic energy over the eastern part of WNP, which is favorable for tropical cyclogenesis;but during the years of weak CEF, the monsoon trough is located westward in the western part of the WNP, consistent with the growth area of eddy kinetic energy. As a result, there are fewer TC geneses over the eastern part of WNP.Besides, the abrupt strengthening of a close-by CEF 2-4 days before tropical cyclogenesis may be the one of its triggers.

关键词： tropical cyclogenesis statistical analysis cross-equatorial flow western North Pacific barotropic energy conversion

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西南季风潮的演变特征与华南降水的关系

西南季风潮的演变特征与华南降水的关系

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中美定量降水监测与预报国际研讨会

作者：郑新江朱福康中国气象局广州热带气象研究所中国气象科学研究院

2004年5月13-22日广东省出现了春季一次连续性阴雨天气过程。在这次过程中,有一条云带从孟加拉湾一直向东延伸至日本,多日维持少动。我们利用QuikSCAT的10米洋面风场资料、卫星云图和水汽图像等资料,对这次连阴雨过程作了分析,发现这次... 详细信息

2004年5月13-22日广东省出现了春季一次连续性阴雨天气过程。在这次过程中,有一条云带从孟加拉湾一直向东延伸至日本,多日维持少动。我们利用QuikSCAT的10米洋面风场资料、卫星云图和水汽图像等资料,对这次连阴雨过程作了分析,发现这次广东省连阴雨天气过程与孟加拉湾西南季风潮相联系,而南海上没有相应的西南季风潮发生。孟加拉湾西南季风潮的盛衰过程可分为三个阶段: (1)“起潮”阶段:5月11日以前孟加拉湾上12°N附近盛行一条西风带。从孟加拉湾到南

关键词： pre-summer rainy period in South China SW monsoon surge cross-equatorial flow

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