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大气环流降尺度因子在中国东部夏季降水预测中的作用

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本文将1951~2007年500 hPa格点资料构成的表征区域系统的环流特征量作为降尺度因子,使用降尺度技术和偏最小二乘回归方法,以环流特征量作为因子场,建立逐月的我国东部夏季降水量的预报模型.从最佳预报模型中的环流特征量出现频率的角度,对大气环流降尺度因子在我国东部夏季降水预测中的作用进行分析研究.结果表明,在夏季各个月份的预报模型中,出现频率表现最突出的因子是北半球和东半球副高系统.此外,东亚地区副高系统也起十分重要的作用,特别是西太平洋副高强度和面积指数.
A Study of Downscaling Factors of Atmospheric Circulations in the Prediction Model of Summer Precipitation in Eastern China
The factors of atmospheric circulations in the prediction model,which is built by the downscaling techniques and the partial least square regression for summer precipitation in eastern China,are studied by using the monthly data of the 74 characteristic quantities of the northern hemispheric circulations,and the precipitation at 160 stations over eastern China.The study is based on the occurrence frequency of the characteristic quantity in the best prediction model.The results show that the factors with higher occurrence frequency are the subtropical high systems in the Northern Hemisphere and the Eastern Hemisphere.Next,the subtropical high systems in East Asia also play very important roles,especially the strength and area index of the subtropical high in the western Pacific.

summer precipitation predictiondownscaling techniquescharacteristic quantities of atmospheric circulationspartial least square regression

魏凤英、黄嘉佑

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中国气象科学研究院灾害天气国家重点实验室,北京,100081

北京大学物理学院大气科学系,北京,100871

夏季降水量 统计降尺度 环流特征量 偏最小二乘回归

公益性行业(气象)科研专项灾害天气国家重点实验室自主研究课题

GYHY200706005和20094160222009LASWZF01

2010

大气科学
中国科学院大气物理研究所

大气科学

CSTPCDCSCD北大核心
影响因子:2.11
ISSN:1006-9895
年,卷(期):2010.34(1)
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