我国副热带地区夏季深对流活动气候分布特征  

Climatology of Deep Convection over the Subtropics of China during Summer

作　　者：郑永光[1,2] 王颖[3,4] 寿绍文[4] 

机构地区：[1]国家气象中心,北京100081 [2]中国气象局武汉暴雨研究所,武汉430074 [3]浙江省气象服务中心,杭州310017 [4]南京信息工程大学,南京210044

出　　处：《北京大学学报（自然科学版）》2010年第5期793-804,共12页Acta Scientiarum Naturalium Universitatis Pekinensis

基　　金：武汉暴雨研究所暴雨研究开放基金(IHR2008K02);国家自然科学基金(40875019;40921160380);国家气象中心预报员专项基金;科学技术部公益性行业(气象)科研专项基金(GYHY200906003;GYHY200906004)资助

摘　　要：利用1996—2007年(无2004年)11年6—8月具有较高时、空分辨率与很好时、空完整性的静止卫星红外亮温(TBB)资料,给出了我国副热带地区(94°—124°E,24°—36°N)夏季的深对流活动气候分布特征。该地区夏季深对流活动存在3个活跃中心:青藏高原东部的川西高原及云南北部部分区域,云贵高原东北部的云南、贵州交界区域以及广西北部区域,浙江、福建与江西大部区域。深对流活动与地势分布、东亚夏季风和大气环流密切相关,不同区域的深对流活动具有不同的月际和候际变化特征,深对流活动具有显著的间歇性发展特征。江淮流域的候变化特征清楚地反映了该区域的梅雨期降水和二度梅降水。深对流活动日变化演变表明川西高原、云贵高原、浙闽地区等不同地区的深对流活动具有不同的传播特征。这种深对流活动的日变化传播特征与区域地势分布密切相关。我国副热带地区存在单峰型和双峰型两类日变化特征深对流,但不同地区同类型日变化深对流也具有不同的日变化特点。川西高原、云贵高原与浙闽地区深对流日变化都为单峰型,但川西高原与云贵高原深对流比浙闽地区持续活跃时间更长。四川盆地东部、江淮流域、湖南与广西区域都属于双峰型深对流活动区域,但四川盆地东部深对流活动主峰在日出前(22UTC),不同于江淮流域、湖南与广西在日落时段(09—10UTC)的深对流活动主峰。Due to the finer temporal and spatial resolution and the better integrality of long-term satellite infrared（IR） temperature of black body（TBB） data,a climatology of deep convection over the subtropics of China（94°-124°E,24°-36° N） during summer is presented based on the 1-hourly IR TBB data during June to August of 1996-2007（2004 excluded）.The results show that the climatological characteristics of deep convection denoted by TBB≤-52℃ over the subtropics of China are basically consistent with those previous statistical studies based on the surface thunderstorm observations and the low-orbit satellite lightning observations.The monthly variations,pentad variations and diurnal variations of the deep convection over the subtropics of China are focused on.The results show that there are 3 active deep convection areas in the subtropics of China during the period of June-August：Plateaus of Western Sichuan,northeast Yunnan-Guizhou Plateaus,and Zhejiang-Fujian-Jiangxi areas.The monthly variations of the deep convection over the subtropics of China are closely associated with the East Asia Monsoon and the large-scale atmospheric circulation.The deep convection is more active in June and July than in August.The development of the deep convection over the subtropics of China has a characteristic of intermittence,and the active pentad period of the deep convection over the Yangtze-Huaihe River Basin clearly reflects the rainfall events during the Meiyu period and the secondary Meiyu period.The diurnal evolution of the deep convection shows that the deep convection over the Plateaus of Western Sichuan propagates southeastwards after sunset,and then propagates northeastwards to the east Sichuan Basin after midnight,the deep convection over the northeast Yunnan-Guizhou Plateaus propagates southeastwards to north Guangxi after sunset,and the deep convection over Zhejiang-Fujian areas extends westwards and northwards at sunset and retreats eastwards and southwards after sunset.This characteristic of the d

关 键 词：我国副热带 气候分布 深对流 日变化 

分 类 号：P468[天文地球—大气科学及气象学]