| A Possible Linkage in the Interdecadal Variability of Rainfall over North China and the Sahel |
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| 作者姓名： | REN Baohu LU Riyu XIAO Ziniu |
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| 作者单位： | School of Earth and Space Sciences，University of Science and Technology of China，Hefei 230026State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics，Institute of Atmospheric Physics，Chinese Academy of Sciences，Beijing 100029，State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics，Institute of Atmospheric Physics，Chinese Academy of Sciences，Beijing 100029，Meteorological Institute of Yunnan Province，Kunming 650032 |
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| 摘 要： | 1. Introduction The capital city of China, Beijing, and other largecities, such as Tianjin and Shijiazhuang are all locatedin North China (roughly the region 35?–40?N, 110?–125?E), a region with a very large population. In thepast several decades, the rainfall decreased remarkablyin North China. Nevertheless, the amount of waterdemanded by agriculture and industry and the popu-lation at large has increased. These two trends havemade the de?ciency of water resources in North Chinabeco…
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A possible linkage in the interdecadal variability of rainfall over North China and the Sahel |
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| REN Baohu,LU Riyu,XIAO Ziniu.A Possible Linkage in the Interdecadal Variability of Rainfall over North China and the Sahel[J].Advances in Atmospheric Sciences,2004,21(5):699-707. |
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| Authors: | REN Baohua LU Riyu XIAO Ziniu |
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| Institution: | School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026;State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics,Institute of Atmospheric Physics, Chinese Academy of Science,Beijing 100029 State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 Meteorological Institute of Yunnan Province, Kunming 650032 |
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| Abstract: | The instrumental records of precipitation, including some historical documentary evidence, show that the rainfall in North China during the rainy season (July and August) exhibits an interdecadal variability similar to the Sahelian rainfall. Both these areas exhibited a weak interdecadal rainfall variability prior to the 1950s, and experienced a long-lasting drought since the 1960s, with two rainfall decreasing transitions,one around the year 1965 and another in the late 1970s. NCEP/NCAR reanalysis data are used to analyze the associated changes in atmospheric circulation during the second decrease transition. The changes of local atmospheric circulation at the end of the 1970s, at both lower and upper levels, contribute to the less precipitation in North China and the Sahel. |
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| Keywords: | North China the Sahel rainfall interdecadal variability |
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