• Adv. Atmos. Sci.  2019, Vol. 36 Issue (1): 15-28    DOI: 10.1007/s00376-018-8095-5
    Role of the Nocturnal Low-level Jet in the Formation of the Morning Precipitation Peak over the Dabie Mountains
    Peiling FU1, 2, Kefeng ZHU1, *(), Kun ZHAO1, Bowen ZHOU1, Ming XUE1, 3
    1Key Laboratory of Mesoscale Severe Weather/Ministry of Education and School of Atmospheric Sciences, Nanjing University, Nanjing 210093, China
    2Guangzhou Meteorological Observatory, Guangzhou 511430, China
    3Center for Analysis and Prediction of Storms, University of Oklahoma, Norman Oklahoma 73072, USA
    Abstract
    Abstract  

    The diurnal variation of precipitation over the Dabie Mountains (DBM) in eastern China during the 2013 mei-yu season is investigated with forecasts of a regional convection-permitting model. Simulated precipitation is verified against surface rain-gauge observations. The observed morning precipitation peak on the windward (relative to the prevailing synoptic-scale wind) side of the DBM is reproduced with good spatial and temporal accuracy. The interaction between the DBM and a nocturnal boundary layer low-level jet (BLJ) due to the inertial oscillation mechanism is shown to be responsible for this precipitation peak. The BLJ is aligned with the lower-level southwesterly synoptic-scale flow that carries abundant moisture. The BLJ core is established at around 0200 LST upwind of the mountains. It moves towards the DBM and reaches maximum intensity at about 70 km ahead of the mountains. When the BLJ impinges upon the windward side of the DBM in the early morning, mechanical lifting of moist air leads to condensation and subsequent precipitation.

    Keywords nocturnal boundary layer      low-level jet      diurnal variation      precipitation      Dabie Mountains      mei-yu season     
    Corresponding Authors: Kefeng ZHU   
    Just Accepted Date: 31 August 2018   Issue Date: 01 November 2018
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    Peiling FU
    Kefeng ZHU
    Kun ZHAO
    Bowen ZHOU
    Ming XUE
    Cite this article:   
    Peiling FU,Kefeng ZHU,Kun ZHAO, et al. Role of the Nocturnal Low-level Jet in the Formation of the Morning Precipitation Peak over the Dabie Mountains[J]. Adv. Atmos. Sci., 2019, 36(1): 15 -28 .
    URL:  
    http://159.226.119.58/aas/EN/10.1007/s00376-018-8095-5     OR     
    http://159.226.119.58/aas/EN/Y2019/V36/I1/15
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