辽宁省降水日数的气候变化特征

Climatic characters of precipitation days in Liaoning Province

利用均匀分布在辽宁省39个测站1961-2005年的逐日降水量资料,分析了近45 a来辽宁省年、季、月降水日数,及连续降水日数和连续无降水日数的长期变化趋势以及空间分布状况。结果表明,近45 a来辽宁省年降水日数是明显减少的,平均每10 a减少1.8d,显著减少的区域在辽东半岛和部分沿海地区,显著减少的季节是夏季;连续降水日数在雨季以负趋势为主,而连续无降水日数则以正趋势为主,在辽河平原的西部以及辽西山区的大部两者趋势都很明显,说明这些地区干旱出现的几率在增大。

The secular trend variation and spatial distribution of annual（seasonal/monthly） precipitation days, the continuous precipitation days and the continuous non-precipitation days were investigated by using the daily precipitation data at 39 stations distributed in Liaoming Proringce during the period of 1961 -2005. The results indicate that the annual precipitation days have declined obviously at a mean rate of 1.8 days per decade and notably negative trends exist in the Liaodong Peninsula and coastal regions. The reduction of summer precipitation days is most remarkable. In rainy season the negative trend of the continuous precipitation clays is dominant and the increase of the continuous non-precipitation clays is prevailing. The trends of the continuous precipitation days and the continuous non-precipitation days are conspicuous in the western region of Liaohe Plain and the mostly western mountain regions of Liaoning. It indicates that drought appears with high frequency in these regions.