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当前位置: 首页 > 文章 > 陕西省夏季降水特征及其与太平洋地区OLR的关系 安徽农业科学 2015 (7) 205-208
Position: Home > Articles > Characteristics of Summer Precipitation in Shaanxi Province and Its Relationship with OLR over Pacific Ocean Journal of Anhui Agricultural Sciences 2015 (7) 205-208

陕西省夏季降水特征及其与太平洋地区OLR的关系

作  者：
陈小婷
单  位：
陕西省气象台
关键词：
夏季降水;OLR;小波分析;奇异值分解
摘  要：
利用美国NOAA卫星观测的逐月平均OLR资料和陕西省96个自动站观测降水资料,对1981~2010年陕西夏季降水变化特征以及陕西夏季降水和太平洋地区地气系统射出长波辐射(OLR)之间的关系进行了分析。结果表明,1981~2010年陕西省夏季平均降水有微弱的减少趋势,但不同区域表现并不一致,陕北降水明显减少,关中、陕南明显增加;陕西夏季降水存在一个7年左右、2年左右的周期,7年左右的周期占主导地位;陕西夏季降水偏多年,同期赤道西太平洋地区OLR正异常明显,对流偏弱,日本岛东南洋面OLR负异常明显,对流较强,前冬与前春赤道太平洋地区OLR呈"西正东负"分布,反之亦然;奇异值分解(SVD)分析表明,太平洋地区OLR与陕西夏季降水之间关系密切。
译  名：
Characteristics of Summer Precipitation in Shaanxi Province and Its Relationship with OLR over Pacific Ocean
作  者：
CHEN Xiao-ting;Shaanxi Meteorological Observatory;
关键词：
Summer precipitation;;OLR;;Wavelet analysis,SVD(Singular Value Decomposition)
摘  要：
Based on the NOAA OLR(Outing Long wave Radiation) data and Shaanxi rainfall data of 96 stations from 1981 to 2010,the characteristics of summer precipitation in Shaanxi Province and its relationship with OLR over Pacific Ocean were analyzed. Results show that:summer precipitation in Shaanxi Province between 1981-2010 have a moderate decline,but different areas have different performance,in Northern Shaanxi there is significantly reduce,while in the other places its rainfall increased significantly. There is a cycle of 7 a and 2 a in summer precipitation in Shaanxi Province and the period of 7 years dominated. In summer rainy year,the OLR over the Equatorial Western Pacific was higher,implying the convection was weaker,the OLR over southeast Ocean of Japan was lower,implying the convection was stronger,preliminary winter and spring the OLR over Equatorial Pacific have a feature that west was positive east was negative and vice versa. SVD analysis suggests that there is close relationship between the OLR over Pacific and summer rainfall in Shaanxi.

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