Change in Extreme Temperature and Precipitation over Northern China During the Second Half of the20th Century
Change in Extreme Temperature and Precipitation over Northern China During the Second Half of the20th Century
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发表时间：
2003
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通讯作者：
Zhai Panmao
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作者：
Zhai Panmao
对极端天气气候变化的研究已成为现代气候变化研究的一个重要方面。基于20世纪后半叶200个站的每日地面气温资料和739个站的每日降水量资料，主要根据非参数分布的百分位数设计极端气候分析方案，并根据新设计的质量控制程序去除每日数据中的粗差。研究了中国北方极端气候事件的时空变化特征。主要结论如下：1）最高气温超过35 ℃的天数略有减少。华北平原和河西走廊减少趋势明显。但是，自20世纪90年代以来，极端高温日大大增加。同时，我国北方地区霜冻日数明显减少，尤其是北方东部和新疆维吾尔自治区。除华北南部外，95 ° C日最高气温呈上升趋势，5 ° C日最低气温呈明显下降趋势。2)极端强降水事件在西北大部分地区明显增多，而在东北东部和华北大部分地区减少。内蒙古东部和东北东部的暴雨日数增加，而东北平原和华北的暴雨日数明显减少。
Study on change of weather and climate extremes has become an important aspect inmodern climate change research. Based on the daily surface air temperature data from 200 stations and daily precipitation data from 739 stations during the second half of the 20th century, schemes for analyzing climate extremes were designed mainly according to percentiles of a non-parametric distribution and the gross errors in the daily data were removed based on a newly designed quality control procedure. The spatial and temporal characteristics of change of climate extremes over northern China were studied. The main conclusions are summarized as follows: 1) The number of days with maximum temperatures over 35 o C decreased slightly. The decreasing trends are obvious in the North China Plain and the Hexi Corridor. However, since the 1990s, the extreme hot days increased greatly. Meanwhile, the frost days decreased significantly in northern China, especially in the eastern part of northern China and Xinjiang Uygur Autonomous Region. Increase trends were found for the 95th percentiles of daily maximum temperatures except in the southern part of North China, while obvious decrease trends were found for the 5th percentiles of daily minimum temperatures. 2) The extreme intense precipitation events obviously increased in much of northwestern China but decreased in the eastern part of northeastern China and most parts of North China. The number of heavy rain days increased in eastern Inner Mongolia and eastern Northeast China, but obviously decreased in the Northeast China Plain and North China.