利用FY2E卫星降水资料对西藏地区降水日变化特征分析
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摘要
为揭示西藏地区5~9月降水日变化,利用FY2E降水产品和西藏150个自动站降水资料,采取统计和谐波分析方法研究西藏地区降水日变化。结果表明:FY2E降水资料能很好地反映西藏降水量的相对强弱和大致过程;降水量依赖于短时强降水,而不是靠降水次数;降水量有明显的日变化,在当地时间傍晚前后降水量达到峰值;降水频率在一天中则有多个峰值,日变化不明显;自动站表明西藏降水也有明显的日变化,与卫星资料峰值时间误差主要是由于西藏东南地区和樟木沿线降水量远大于其他地区造成的;降水量谐波分析表明西藏地区的降水日变化非常显著;无论是降水量还降水频率,西藏全区表现出明显的夜雨特征,在日喀则东北至拉萨为西藏地区的夜雨中心。
To reveal the rainfall diurnal variation in the Tibetan area from May to September,according to FY2 E hourly precipitation products and 150 Tibet regional automatic stations,adopt to study the diurnal precipitation in Tibet.The results showed that:FY2 E precipitation data can well reflect the relative strength of Tibet area rainfall and general process.Precipitation depend on the short-time strong rainfall,rather than the precipitation frequency.The precipitation show Tibetan areas ha obvious diurnal variation,around the local time about in the evening before and after the ainfall peak.The precipitation frequency ha more than one peak in a day and its diurnal is not obvious.The regional automatic stations also show that precipitation ha obvious diurnal variation in Tibet,The error of peak time mainly due to the precipitation in south-east and south Tibet is greater than in other regions.The harmonic analysis show remarkable daily variability in Tibet's precipitation.Both precipitation and precipitation frequency show significant night-rain,the Xigaze to northeast Lhasa in Tibet the night-rain center.
To reveal the rainfall diurnal variation in the Tibetan area from May to September,according to FY2 E hourly precipitation products and 150 Tibet regional automatic stations,adopt to study the diurnal precipitation in Tibet.The results showed that:FY2 E precipitation data can well reflect the relative strength of Tibet area rainfall and general process.Precipitation depend on the short-time strong rainfall,rather than the precipitation frequency.The precipitation show Tibetan areas ha obvious diurnal variation,around the local time about in the evening before and after the ainfall peak.The precipitation frequency ha more than one peak in a day and its diurnal is not obvious.The regional automatic stations also show that precipitation ha obvious diurnal variation in Tibet,The error of peak time mainly due to the precipitation in south-east and south Tibet is greater than in other regions.The harmonic analysis show remarkable daily variability in Tibet's precipitation.Both precipitation and precipitation frequency show significant night-rain,the Xigaze to northeast Lhasa in Tibet the night-rain center.
引文
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[2]戴泽军,宇如聪,陈昊明.湖南夏季降水日变化特征[J].高原气象,2009,(6):1463-1470.
[3]列杰班宗,罗布,王伟.西藏地区气象自动站夏季逐时降水资料特征分析[J].高原山地气象研究,2012,(2):77-80.
[4]余忠水,康世昌,蒋建莹.青藏高原夏季夜雨率空间分布及其变化特征[J].山地学报,2011,05:627-632.
[5]段春锋,曹雯,缪启龙,等.中国夏季夜雨的空间分布特征[J].自然资源学报,2013,(11):1935-1944.
[6]Yang G Y,Slingo J J.The diurnal cycle in the tropics Monthly Weather Review,2001,129:784-801.
[7]白爱娟,刘晓东,刘长海.青藏高原与四川盆地夏季降水日变化的对比分析[J].高原气象,2011,(4):852-859.
[8]张蒙蒙,江志红.我国高分辨率降水融合资料的适用性评估[J].气候与环境研究,2013,(4):461-471.
[9]金霞.四川盆地降水日变化特征分析及成因研究[D].北京:中国气象科学研究院,2013.
[10]杨军.气象卫星及其应用[M].北京:气象出版社,2012:380-381,383-384.
[11]白爱娟,刘长海,刘晓东.TRMM多卫星降水分析资料揭示的青藏高原及其周边地区夏季降水日变化[J].地球物理学报,2008,(3):704-714.
[12]李国平.青藏高原动力气象学[M].北京:气象出版社,2007:16-17.
[13]杜军,马玉才.西藏高原降水变化趋势的气候分析[J].地理学报,2004,(3):375-382.
[14]杨伟愚,叶笃正,吴国雄.夏季青藏高原气象学若干问题的研究[J].中国科学(B辑化学生命科学地学),1990,(10):1100-1111.
[15]王天义,朱克云,张杰,等.2010~2011年西藏雷暴的雷达回波统计特征分析[J].成都信息工程学院学报,2013,(3):267-273.
[16]Roy S S,Balling R C.Analysis of diurnal patterns in winter precipitation across the conterminous United States[J].Monthly Weather Review,2005,133::707-711.
[17]李景玉,张志果,徐宗学,等.影响西藏地区蒸发皿蒸发量的主要气象因素分析[J].亚热带资源与环境学报,2009,(4):20-29.
[18]张核真,唐小萍,普布卓玛.近46年西藏高原昼夜降水变化趋势[J].气象科技,2010,(2):205-208+283.