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Open AccessArticle

Association of Diurnal Rainfall in Northeastern Tibetan Plateau with the Retreat of the South Asian High

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Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions, Northwest Institute of Eco-Environment and Resources, CAS, Lanzhou 730000, China
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Department of Plants, Soils, and Climate, Utah State University, Logan, UT 84322, USA
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Utah Climate Center, Utah State University, Logan, UT 84322, USA
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Research Center for Environmental Changes, Academia Sinica, Taipei 11529, Taiwan
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Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM 87131, USA
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Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, School of Atmospheric Science, Chengdu University of Information Technology, Chengdu 610225, China
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Collaborative Innovation Center on Forest and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology, Nanjing 210044, China
*
Authors to whom correspondence should be addressed.
Atmosphere 2020, 11(1), 105; https://doi.org/10.3390/atmos11010105
Received: 2 November 2019 / Revised: 27 December 2019 / Accepted: 6 January 2020 / Published: 15 January 2020
(This article belongs to the Section Meteorology)
The characteristics of intense diurnal precipitation occurring beneath the South Asian High (SAH) are diagnosed in the summer monsoon season from 2010 to 2015 using observational data. The diagnostics indicate that summer nighttime rainfall events in the northeastern Tibetan Plateau can intensify towards the end of the monsoon period. By defining a transition index to identify the transition day during which the episodes of diurnal convection start to decline, daily thermodynamic properties and precipitation from each year were composited before and after the transition date. The analysis reveals that warmer air, increased moisture, and stronger upward velocity are present in the atmosphere before the transition day, potentially elevating nighttime convective precipitation. Enhanced upward velocity that is present through the two months prior to transition date coincides with the timing of the peak SAH, while weakened upward velocity afterwards coincides with its subsequent retreat. The large-scale lift due to terrain-ambient air interaction underneath the SAH and the increased moisture content can enhance the potential for diurnal convection, which lends support to the nighttime peak of rainfall. This feature persists until the transition date, after which the SAH starts to retreat. View Full-Text
Keywords: diurnal rainfall; South Asian High; Northeastern Tibetan Plateau diurnal rainfall; South Asian High; Northeastern Tibetan Plateau
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Zhao, L.; Wang, S.-Y.S.; Wu, C.-H.; Los, S.; Lyu, S.; Meng, X.; Wen, L.; Luo, S.; Ao, Y.; Li, Z. Association of Diurnal Rainfall in Northeastern Tibetan Plateau with the Retreat of the South Asian High. Atmosphere 2020, 11, 105.

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