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首页> 外文期刊>Theoretical and applied climatology >Statistical properties of moisture transport in East Asia and their impacts on wetness/dryness variations in North China
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Statistical properties of moisture transport in East Asia and their impacts on wetness/dryness variations in North China

机译：东亚地区水汽输送的统计特征及其对华北地区干湿变化的影响

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摘要

Dryness and wetness variations in east China were analyzed using the standardized precipitation index (SPI) based on monthly precipitation data for 1961-2005. A drying trend over North China was observed, which can be attributed to decreasing precipitation since the late 1970s. Moreover, NCAR/NCEP reanalysis dataset was used to investigate causes behind the drying trend in North China. The moisture flux on the regional boundaries of East China was calculated and a higher wavelet power spectrum for low-latitude boundaries (based on 20 and 25°N) occurred with significant periods in a 1-year band during 1961-2005; however, since 1977, a significant 1 -year period can no longer be detected on the northern boundary of South China (based on 35°N). The summer moisture flux during 1961-1977, when compared to the same during 1978-2005, has increased in East China. Good matches are found between moisture alterations and precipitation changes, and are also confirmed by the periods of moisture transport along different latitudes. The significant 1 -year periods of moisture transport along the mid-latitude boundary (based on 35°N) have disappeared since 1977, which could be the causes behind the drought in North China. The disappearance of the significant 1-year band of moisture transport along the mid-latitude boundary (based on 35°N) in the late 1970s could be a result of the significantly decreased moisture transport in North China in summer. When southerly winds are weakened in East Asia, the southwesterly winds can only reach the south of the lower Yangtze River, which is the major cause behind the frequent summer droughts in North China in the recent years.
机译：基于1961-2005年月度降水数据，使用标准降水指数（SPI）分析了华东地区的干湿变化。观察到华北地区出现了干旱的趋势，这可以归因于自1970年代后期以来降水的减少。此外，NCAR / NCEP再分析数据集用于调查华北地区干燥趋势的原因。计算了华东地区边界上的水汽通量，并在1961-2005年的1年频带内出现了较大周期的低纬度边界（基于20和25°N）较高的小波功率谱；但是，自1977年以来，在中国南方的北部边界（以35°N为基准）不再能检测到明显的1年期。与1978-2005年的夏季相比，1961-1977年的夏季水分通量有所增加。在水分变化和降水变化之间找到了很好的匹配，并且沿着不同纬度的水分传输周期也证实了这一点。自1977年以来，沿中纬度边界（以35°N为基准）的水汽输送的重要一年周期就消失了，这可能是造成华北干旱的原因。 1970年代末期，沿中纬度边界（以35°N为基准）的1年显着的水汽输送带消失的原因可能是夏季华北地区水汽输送明显减少的结果。当东亚的南风减弱时，西南风只能到达长江下游南部，这是近年来华北夏季干旱频发的主要原因。

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  • 来源
    《Theoretical and applied climatology》 |2011年第4期|p.337-347|共11页
  • 作者

    Zengxin Zhang; Qiang Zhang; Xi Chen; Jinchi Zhang; Jianwei Zhou;

  • 作者单位

    Jiangsu Key Laboratory of Forestry Ecological Engineering,Nanjing Forestry University,159 Longpan Road,Nanjing 210037, China,State Key Laboratory of Hydrology-Water Resources andHydraulic Engineering, Hohai University,1 Xikang Road,Nanjing 210008, China,Key Laboratory of Meteorological Disaster of Ministry ofEducation, Nanjing University of Information Science &Technology,219Ninliu Road,Nanjing 210044, China;

    Department of Water Resources and Environment,Sun Yat-sen University,135 Xingangxi Road,Guangzhou 510275, China,Key Laboratory of Water Cycle and Water Security in SouthernChina of Guangdong High Education Institute,Sun Yat-sen University,135 Xingangxi Road,Guangzhou 510275, China;

    State Key Laboratory of Hydrology-Water Resources andHydraulic Engineering, Hohai University,1 Xikang Road,Nanjing 210008, China;

    Jiangsu Key Laboratory of Forestry Ecological Engineering,Nanjing Forestry University,159 Longpan Road,Nanjing 210037, China;

    Key Laboratory of Meteorological Disaster of Ministry ofEducation, Nanjing University of Information Science &Technology,219Ninliu Road,Nanjing 210044, China;

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