寧夏地表濕潤狀況演變規(guī)律研究

doi:10.3969/2012jms.00**

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寧夏地表濕潤狀況演變規(guī)律研究
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                        10.3969/2012jms.00**
                    
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中圖分類號:P412
基金項(xiàng)目:國家科技部項(xiàng)目"寧夏氣候?qū)θ驓夂蜃兓捻憫?yīng)及其機(jī)制(2004DIB3J121)"

The research on the change of surface humid index in Ningxia

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利用1961-2004a寧夏23站月降水和平均氣溫資料,通過計算地表濕潤指數(shù),分析了寧夏區(qū)域平均及不同區(qū)域地表濕潤指數(shù)的年代際變化特征及季節(jié)性差異.最后,給出了地表濕潤指數(shù)年及各季節(jié)變化趨勢的地理分布.結(jié)果表明:近40a來寧夏年地表濕潤指數(shù)總趨勢是下降的,即地表在變干;地表濕潤指數(shù)的變化具有明顯的階段性特征,即1970s末期以前的冷濕期,1970s末至1980s中期的冷干期,1980s中期以來的暖干期;寧夏的干化趨勢主要發(fā)生在秋季;寧夏年、秋季地表顯著變干的中心區(qū)域主要集中在中部干旱帶及南部山區(qū)的北部;冬季南部山區(qū)存在顯著變濕趨勢,春、夏季各地均無顯著干、濕變化趨勢.

Abstract:

Based on the 23 observational stations data of monthly precipitation and mean monthly temperature over Ningxia from 1961 to 2004,by use of the surface humid index computed from the data, decadal variation and the seasonal differences of the surface humid index over Ningxia have been analyzed.The geographical distributions and trends of surface humid index have been given in this area. The results indicated that the total trend of the surface humid index of Ningxia has dropped in past more than 40 years, namely the earths surface is becoming dry. The change of the surface humid index has obvious phase characteristics. Cold and wet climate was main characteristic of Ningxia from the sixties to latter stage of the seventies. The climatic characteristic was cold and dry from 1978 to 1988. And the climate has been warm and dry since the 1990s. The drying trend of Ningxia generally occurred in autumn.The centre area where the earths surface becomes dry notably was in the central arid strip part and the north part of loess hills area of south in Ningxia. The winter has an tendency of wetting in loess hills area of south in Ningxia. But there is no notably wet or dry tendency in all parts of Ningxia in spring and summer.

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鄭廣芬,陳曉光,納麗,張智,許建秋.寧夏地表濕潤狀況演變規(guī)律研究.氣象科學(xué),2008,(5):533-538 Zheng Guangfen,Chen Xiaoguang, Na Li,Zhang Zhi,Xu Jianqiu. The research on the change of surface humid index in Ningxia. Journal of the Meteorological Sciences,2008,(5):533-538

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抽查舔水白紧大视频,冲喜娘子超甜哒激情五月,亚洲黄色图片偷拍网站,亚洲三级黄片免费播放,91在线观看喷潮红桃,日韩精品在线观看一区二区,久久久久久久久久久久黄色片子,日产精品99久久久久久久久,欧洲亚洲另类图片小说