| 1961—2012年河南省夏季降水时空及环流特征 |
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| 引用本文： | 潘攀.1961—2012年河南省夏季降水时空及环流特征[J].气象与环境科学,2014,37(3):27-33. |
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| 作者姓名： | 潘攀 |
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| 作者单位： | 河南省气候中心,郑州,450003 |
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| 基金项目： | 中国气象局气候变化专项，国家自然科学基金青年科学基金项目 |
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| 摘 要： | 根据1961--2012年河南省111个气象观测站逐日降水资料，采用经验正交函数分解、小波分析等方法，研究了近52a河南省夏季降水的时空分布及环流特征。结果表明，河南夏季降水呈现从东南向西北减少的空间分布，淮河沿线为降水最多的区域，豫西和豫西北太行山一线为降水偏少区。全省夏季降水以全省偏多或偏少一致性为主，此外，还呈现南北反相、东西反相的分布特征。夏季降水存在多时间尺度的周期特征分布：在年代际变化尺度上，降水存在22a左右的周期，且在1977年后信号较强；年际变化尺度上以7a周期为主。在降水偏多年，中高纬存在一个东高西低的环流形势，有利于冷空气南下；低层有气旋式环流，高层有明显的东风环流，有利于水汽的聚集。在降水偏少年，环流形势相反，不利于夏季降水。
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| 关 键 词： | 夏季降水 时空分布 环流特征 经验正交函数分解 小波分析 |
Spatial-temporal Variation and Circulation Characteristics of Summer Precipitation in Henan Province During 1961-2012 |
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| Pan Pan.Spatial-temporal Variation and Circulation Characteristics of Summer Precipitation in Henan Province During 1961-2012[J].Meteorological and Environmental Sciences,2014,37(3):27-33. |
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| Authors: | Pan Pan |
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| Institution: | Pan Pan ( Henan Provincial Climate Center, Zhengzhou 450003, China) |
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| Abstract: | Using the 111 station observation data of Henan province during 1961--2012, the spatial- temporal variation and circulation characteristics of summer precipitation in Henan province are analyzed with the method of EOF, wavelet analysis, et al. Results show that the precipitation decreases from southeast to northwest, the region has the highest precipitation along the Huaihe River, and has less pre- cipitation in the western part and northwest along Taihang. Spatial distribution of summer precipitation shows consistent positive over the whole province, in addition, shows opposite from north to south and west to east. The summer precipitation shows multiple periodic characteristics. In the decadal scale, the precipitation has the cycle of 22 years, and get stronger after 1977. In the interannual scale, the period is mainly 7 years. In abundant rainfall years, the circulation in middle and high latitude is high in east and low in west, and it＇ s in favor of cold air moving south. There is cyclonic circulation in the lower level of wind field, and evident easterly wind in the higher level. The coordinate circulation in the high and low level is conducive to moisture accumulation. In less rainfall years, the circulation is contrary, and not in favor of summer precipitation. |
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| Keywords: | summer precipitation spatial and temporal distribution circulation characteristics empirical orthogonal function （EOF） wavelet analysis |
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