黑龙江省极端降水天气的气候变化

Climate Change of Extreme Precipitation Weather in Heilongjiang Province

采用近48 a的降水监测资料,对黑龙江省极端降水天气的气候变化进行分析。结果表明,冬季≥5 mm大雪日数呈稍增加趋势,暴雪≥10 mm增加速率并不显著;夏季≥25 mm大雨日数呈微弱减少趋势,日降雨量≥50 mm暴雨日数变化趋势也并不明显,仅有微弱增加趋势。但空间变化有明显差异,暴雪主要分布在牡丹江东部、佳木斯东部、大兴安岭西北部地区,特别是绥芬河市为暴雪中心;暴雨主要分布在嫩江中下游、松花江干流、牡丹江、黑龙江嘉阴以下流域。

The precipitation data for nearly 48 years was used to analyze the climate change of extreme precipitation weather in the Hielongjiang Province. The results show that more than 5mm or equal to 5mm heavy snow days are increasing slightly and the increase velocity of more than 10mm or equal to 10mm snowstorm is not notable in the winter; more than 25mm or equal to 25mm heavy rain days are decreasing slightly, more than 50mm or equal to 50mm heavy rain days rainfall are not notable, too, and only showing shght increase. However, there is a significant spatial difference for the change, which the snow storm mainly distributes in the eastern part of Mudanjiang, eastern part of Jiamusi, northwestern part of Daxinganling, especially, Suifenhe City is the center of snowstorm;heavy rain mainly distributes in the middle and lower streams of the Nen River, the main stream of the Songhua River and the lower stream of the Mudanjiang and Heilongjiang Rivers.