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Interannual and Interdecadal Variability of Atmospheric Water Vapor Transport in the Haihe River BasinEnglish Full Text

WEI Jie 1, LIN Zhao-Hui 1, XIA Jim 2 and TAO Shi-Yan1 1 Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 (China).2 Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100044(China)

Abstract: The seasonal mean atmospheric precipitable water and water vapor transport over the Haihe River Basin (HRB) inNorth China with a focus on their interannual to interdecadal variability, and then the relationships of the interannual andinterdecadal variability of the water cycle over the HRB to the Pacific Decadal Oscillation (PDO) and El Nino-SouthernOscillation (ENSO) phenomena were investigated using the observational and National Centers for Environmental Pre-diction (NCEP) reanalysis data. There was a strong interdecadal variability for the water cycle (such as precipitationand water vapor transport) over the region, with an abrupt change occurring mostly in the mid 1970s. The intensity ofthe East Asian summer monsoon largely affected the atmospheric water vapor transport. Generally, the net meridionalconvergence of the water vapor flux over the region was relatively large before 1965, and it declined gradually from thenon with a further notable decrease since mid 1970s. Zonal water vapor transport was similar to meridional, but with amuch smaller magnitude and no noteworthy turning in the mid 1970s. Results also suggested that the wind field playedan important role in the water vapor transport over the HRB before the mid 1960s, and the interdecadal variability ofthe water cycle (precipitation, water vapor transport, etc.) in the summer was related to the PDO; however, interannualvariation of the water vapor transport could also be related to the ENSO phenomena.
  • Series:

    (D) Agriculture; (A) Mathematics/ Physics/ Mechanics/ Astronomy

  • Subject:

    Meteorology

  • Classification Code:

    P463;

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