摘要
利用常规探测、自动站逐时雨量及ECMWF0.25°×0.25°每日4次的ERA-interim再分析等资料,分析2010—2018年6—8月天山北坡短时强降水时空分布及其环流配置特征。结果表明:天山北坡短时强降水时空分布不均,主要发生在沿山海拔1000~2000 m区域,尤其昌吉州频次最多;雨强R≥10 mm/h出现频次2015年最多,而R≥20 mm/h出现频次相较前者骤减,2016年出现最多,均在2014年最少,且6月出现最多;短时强降水日变化明显,16时—次日03时发生频次最多,占总次数的73.8%。天山北坡短时强降水过程以局地分散性居多,占总过程的65.1%;影响系统主要分为西西伯利亚低槽(涡)、中亚低槽、中亚低涡、西北气流等4类,其中,西西伯利亚低槽(涡)、中亚低槽两者占总过程的73.2%。
Using conventional detection data,hourly rainfall data of automatic stations and ERA-interim reanalysis data(four times a day),the temporal and spatial distribution of short-duration heavy rain(SDHR for short)on the northern slopes of the Tianshan Mountains and its circulation configuration characteristics from June to August in 2010-2018 were analyzed.The results show that the temporal and spatial distributions of the SDHR on the northern slopes of Tianshan Mountains are both uneven.The SDHR mainly occurs in the area of 1000-2000 meters above sea level,along the mountain,especially in Changji prefecture with the most frequency.The frequency of SDHR≥10 mm/h is the most in 2015,while that of SDHR≥20 mm/h is the most in 2016,but the lowest frequency of the two levels are both in 2014.In terms of monthly distribution,the most frequently of the two levels are both in June,followed by July and August.The diurnal variation of SDHR is obvious.The highest frequency period is 16:00-03:00 BTC(the next day),accounting for 73.8%of the total times.The SDHR processes are mostly with local dispersibilibr,accounting for 65.1%of the total processes.The effect systems are primarily divided into four types:West Siberian low trough(vortex),Central Asia low trough,Central Asia low vortex and northwest airflow.The west Siberian low trough(vortex)types and the Central Asian low trough types accounted for 73.2%of the total processes.There are similarities and differences in circulation configurations.
作者
王勇
张云惠
王智楷
于碧馨
洪月
WANG Yong;ZHANG Yunhui;WANG Zhikai;YU Bixin;HONG Yue(Xinjiang Ecological Meteorology and Satellite Remote Sensing Center,Urumqi 830000,China;Xinjiang Meteorological Observatory,Urumqi 830002,China;Zhongjiang County Meteorological Bureau,Zhongjiang 618100,China)
出处
《沙漠与绿洲气象》
2020年第3期11-18,共8页
Desert and Oasis Meteorology
基金
国家重点研发计划重点专项(2018YFC1507103)
国家自然科学基金(41965002)。
关键词
天山北坡
短时强降水
时空分布
环流配置
north slopes of Tianshan Mountains
short-duration heavy rain
spatial and temporal distribution
circulation configuration
