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Article >  ADVANCES IN ATMOSPHERIC SCIENCES  > 2024 > Accepted Manuscript

The Influence of Airflow transport Path on Precipitation during the Rainy Season in the Liupan Mountain of Northwest China

  • Key Laboratory for Meteorological Disaster Monitoring and Early Warning and Risk Management of Characteristic Agriculture in Arid Regions, China Meteorological Administration

  • Nanjing University of Science and Technology

  • China Meteorological Administration

  • 219 Ningliu Road, Pukou District, Jiangsu Province


doi:  10.1007/s00376-024-3162-6

  • Utilizing observational data from seven ground gradient stations located on the eastern slope, western slope, and mountaintop of Liupan Mountains (LM) during the rainy seasons from 2020 to 2022, combined with backward trajectory cluster analysis, this study investigated the influence of airflow transport paths on the seasonal rainfall in this mountainous region. The results indicate: (1) LM’s rainy season, characterized by overcast and rainy days, is mainly influenced by cold and moist airflows (CMA) from the westerly direction and warm and moist airflows (WMA) from a slightly southern direction. The precipitation amounts under four airflow transport paths are ranked from largest to smallest as follows: WMA, CMA, warm dry airflows (WDA), and cold dry airflows (CDA). (2) WMA contribute significantly more to the intensity of regional precipitation than the other three types of airflows. During localized precipitation events, warm airflows have higher precipitation intensities at night than cold airflows, while the opposite is true during the afternoon. (3) During regional precipitation events, water vapor content is a primary influencing factor. Precipitation characteristics under humid airflows are mainly affected by high water vapor content, whereas during dry airflow precipitation, dynamic and thermodynamic factors have a more pronounced impact than for humid airflows. (4) During localized precipitation events, the influence of dynamic and thermodynamic factors is more complex than during regional precipitation, with precipitation characteristics of the four airflows closely related to their water vapor content, air temperature and humidity attributes, and orographic lifting. (5) Compared to regional precipitation, the influence of topography is more prominent in localized precipitation processes.
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    • Manuscript History

    Manuscript received: 23 July 2023
    Manuscript revised: 17 April 2024
    Manuscript accepted: 23 April 2024
    通讯作者: 陈斌, bchen63@163.com
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    The Influence of Airflow transport Path on Precipitation during the Rainy Season in the Liupan Mountain of Northwest China

    • Manuscript received: 2023-07-23
    • Manuscript revised: 2024-04-17
    • Manuscript accepted: 2024-04-23

    Abstract: Utilizing observational data from seven ground gradient stations located on the eastern slope, western slope, and mountaintop of Liupan Mountains (LM) during the rainy seasons from 2020 to 2022, combined with backward trajectory cluster analysis, this study investigated the influence of airflow transport paths on the seasonal rainfall in this mountainous region. The results indicate: (1) LM’s rainy season, characterized by overcast and rainy days, is mainly influenced by cold and moist airflows (CMA) from the westerly direction and warm and moist airflows (WMA) from a slightly southern direction. The precipitation amounts under four airflow transport paths are ranked from largest to smallest as follows: WMA, CMA, warm dry airflows (WDA), and cold dry airflows (CDA). (2) WMA contribute significantly more to the intensity of regional precipitation than the other three types of airflows. During localized precipitation events, warm airflows have higher precipitation intensities at night than cold airflows, while the opposite is true during the afternoon. (3) During regional precipitation events, water vapor content is a primary influencing factor. Precipitation characteristics under humid airflows are mainly affected by high water vapor content, whereas during dry airflow precipitation, dynamic and thermodynamic factors have a more pronounced impact than for humid airflows. (4) During localized precipitation events, the influence of dynamic and thermodynamic factors is more complex than during regional precipitation, with precipitation characteristics of the four airflows closely related to their water vapor content, air temperature and humidity attributes, and orographic lifting. (5) Compared to regional precipitation, the influence of topography is more prominent in localized precipitation processes.

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