摘要
利用国家气象信息中心提供的各测站多年逐日降水和逐日天气现象资料,在运用旋转经验正交函数(Rotated Empirical Orthogonal Function,REOF)和相关分析进行降雪分区的基础上,重点分析了近46年来我国降雪的时空分布、演变特征和长期气候趋势。结果表明,降雪分布清楚地反映了我国的地理特征和气候特点,即高纬度、高海拔地区降雪多,南方降雪地区集中。在空间上,降雪增加的区域主要分布在新疆北部、东北区北部、西藏高原东部和淮河流域部分地区。在时间上,我国平均年降雪量总体呈弱的减少趋势。在气候变暖的背景下,除东北区北部和西北区西部降雪趋势为正值外,其它分区都为负值,其中长江中下游地区降雪减少最明显。Mann-Kendall检验表明,在20世纪90年代新疆北部、东北区北部的降雪发生了由少到多的突变,且增加趋势显著,其它分区没有突变发生。
The spatial-temporal distributions and variation features and climatic trend of snowfall in China in recent 46 years are studied using the daily precipitation and weather phenomena data provided by National Meteorological Center based on Rotated Empirical Orthogonal Function（REOF） and correlation analysis in snowfall divisions.Eight snowfall divisions are divided in China.The results show that the distribution of snowfall clearly reflects geographic feature of China and climatic characteristics,and namely it appears more snowfall in high latitude and high altitude,centralizes in south area.In space domain,the area that snowfall increases mainly distributes Northern Xinjiang,Northern Northeast,the eastern Tibet Plateau and parts of Huaihe basins.In time domain,the annual mean snowfall in China has been weak and small reduced.During the climate warming,besides the trends of snowfall in Northern Northeast and Western Northwest are positive,other divisions all are negative,among them it is most obviously that snowfall in the mid-and lower-reaches of Yangtze River reduces.Using Mann-Kendall check method,the results show that the high latitude area including Northern Northeast and Western Northwest Division in northern China have indeed abrupt from less to more snowfall in 1990＇s,and keep increasing trend significantly until now,and other divisions have no abrupt yet.
出处
《高原气象》
CSCD
北大核心
2010年第6期1594-1601,共8页
Plateau Meteorology
基金
国家973项目(2009CB723904)
国家自然科学基金项目(40605027)共同资助
