PROGRESS IN GEOGRAPHY ›› 2021, Vol. 40 ›› Issue (7): 1181-1194.doi: 10.18306/dlkxjz.2021.07.009

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Climatic characteristics and monitoring analysis of rainy season in the Haihe River Basin

HAO Lisheng(), HE Liye, CHENG Shanjun, LIANG Sujie   

  1. Tianjin Climate Center, Tianjin 300074, China
  • Received:2020-10-19 Revised:2021-03-05 Online:2021-07-28 Published:2021-09-28
  • Supported by:
    National Natural Science Foundation of China(41805061);National Natural Science Foundation of China(41805058);Special Project of Innovation and Development from China Meteorological Administration(CXFZ2021J30);National Key Research and Development Plan(2018YFA0606300);Strategic Priority Research Program of Chinese Academy of Sciences(XDA20100304)

Abstract:

Based on the daily precipitation and NCEP/NCAR reanalysis circulation data provided by the NOAA/OAR/ESRL Physical Sciences Laboratory, and in view of the difficulties of rainy season monitoring in North China (the Haihe River Basin), this study established a specific humidity subtropical high method (QSH) for monitoring rainy season in the Haihe River Basin based on continuous meteorological variables and through contrast analysis and reasonableness analysis, and the variation of rainy season in the Haihe River Basin was analyzed. The main conclusions are as follows: 1) It is reasonable to monitor the rainy season in the Haihe River Basin by using the specific humidity-subtropical high method, which has good operability in practice. 2) The average start date of rainy season in the Haihe River Basin is 9 July, the end date is 19 August, and the length of rainy season is 41 days. 3) There was no obvious trend of long-term change of comprehensive intensity index, length of rainy season, and accumulated precipitation of rainy season in the Haihe River Basin during 1961-2019. However, there were obvious interdecadal variations, that is, the rainy season in the Haihe River Basin has a strong or weak periodic change every 18 years, which is in a weak period in recent years.

Key words: Haihe River Basin, rainy season, monitoring, North China