河北省寒潮的气候特征与冬季增暖

Climatic Characteristics of Cold Wave Weather and Warming Winter in Hebei Province During 1962-2008

利用1962～2008年河北省142站逐日气温资料,对河北省寒潮天气的时空分布及变化进行了统计分析。结果表明:河北省寒潮天气年际、月际变化大,在气候变暖的大背景下,寒潮出现次数总的趋势是减少的;寒潮区域分布表现为由西北高原山地向东南平原递减的规律;降温幅度与地理特征关系明显,北部地区降温幅度比南部地区大,而南部的低洼地区及沙地等地区降温幅度也比较大;极端最低气温分布为内陆低、沿海高,高纬低、低纬高,南北差别大;寒潮减少与冬季增暖的趋势有明显相关性,河北省冬半年平均气温呈波动性上升趋势,而平均最低气温上升最为明显。

Based on daily temperature observations at 142 meteorological stations in Hebei Province during 1962 -2008, the temporal and spatial distribution and variation of cold wave weather occurred in Hebei Province were statistically analyzed. The results show that the cold wave weather in Hebei Province presented significant annual and monthly variability. Under the background of global warming, the frequency of cold wave weather declined in the whole Hebei Province. The cold wave frequency gradually decreased from the northwest to southeast region. There was a close relationship between temperature decrease and geographical characteristics, in the northern region temperature drop was more than that in southern region, but the low - lying and sand areas in the south of Hebei Province temperature drop was more too. The extreme minimum temperature was lower in inland areas than that in coastal areas. The reduction of cold wave weather correlated obviously with winter warming trend in Hebei Province, the mean temperature and the mean minimum temperature in winter presented increasing trend.