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Interannual and Interdecadal Variability of Atmospheric Water Vapor Transport in the Haihe River Basin

机译：海河流域大气水汽输送的年际和年代际变化

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摘要

The seasonal mean atmospheric precipitable water and water vapor transport over the Haihe River Basin (HRB) in North China with a focus on their interannual to interdecadal variability, and then the relationships of the interannual and interdecadal variability of the water cycle over the HRB to the Pacific Decadal Oscillation (PDO) and El Nino-Southern Oscillation (ENSO) phenomena were investigated using the observational and National Centers for Environmental Prediction (NCEP) reanalysis data. There was a strong interdecadal variability for the water cycle (such as precipitation and water vapor transport) over the region, with an abrupt change occurring mostly in the mid 1970s. The intensity of the East Asian summer monsoon largely affected the atmospheric water vapor transport. Generally, the net meridional convergence of the water vapor flux over the region was relatively large before 1965, and it declined gradually from then on with a further notable decrease since mid 1970s. Zonal water vapor transport was similar to meridional, but with a much smaller magnitude and no noteworthy turning in the mid 1970s. Results also suggested that the wind field played an important role in the water vapor transport over the HRB before the mid 1960s, and the interdecadal variability of the water cycle (precipitation, water vapor transport, etc.) in the summer was related to the PDO; however, interannual variation of the water vapor transport could also be related to the ENSO phenomena.
机译：华北海河流域（HRB）的季节平均大气可降水量水汽和水汽输送，重点是它们的年际到年代际变化，然后是HRB上水循环的年际和年代际变化与海平面变化的关系。使用观测和国家环境预测中心（NCEP）重新分析数据研究了太平洋年代际涛动（PDO）和厄尔尼诺-南方涛动（ENSO）现象。该地区水循环的年代际变化很大（例如降水和水蒸气的输送），其突变主要发生在1970年代中期。东亚夏季风的强度在很大程度上影响了大气水汽的输送。通常，该地区水汽通量的净子午收敛在1965年之前相对较大，此后逐渐下降，自1970年代中期以来进一步明显下降。区域水汽输送与子午线相似，但幅度较小，在1970年代中期没有明显的转向。结果还表明，风场在1960年代中期之前的高铁水汽输送中起着重要作用，夏季水循环的年代际变化（降水，水汽输送等）与PDO有关。 ;然而，水汽输送的年际变化也可能与ENSO现象有关。

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