Effect of Atmospheric Heat Source on the Tibetan Plateau Vortex During Different Developmental Stages—A Case Study in July 2013

Shu ZHOU; Fang SUN; Meirong WANG; Shunwu ZHOU; Yiyu QING

doi:10.3878/j.issn.1006-9895.2211.21267

Chinese Journal of Atmospheric Sciences > 2023 > 47(3): 907-919. > DOI: 10.3878/j.issn.1006-9895.2211.21267

ZHOU Shu, SUN Fang, WANG Meirong, et al. 2023. Effect of Atmospheric Heat Source on the Tibetan Plateau Vortex During Different Developmental Stages—A Case Study in July 2013 [J]. Chinese Journal of Atmospheric Sciences (in Chinese), 47(3): 907−919. DOI: 10.3878/j.issn.1006-9895.2211.21267

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Effect of Atmospheric Heat Source on the Tibetan Plateau Vortex During Different Developmental Stages—A Case Study in July 2013

Shu ZHOU^{1, 2,},
Fang SUN^{1, 3},
Meirong WANG^1, ,,
Shunwu ZHOU¹,
Yiyu QING¹

1.
Key Laboratory of Meteorological Disaster, Ministry of Education/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Joint International Research Laboratory of Climate and Environment Change/Joint Center for Data Assimilation Research and Applications, Nanjing University of Information Science & Technology, Nanjing 210044
2.
Bijie Meteorology Bureau, Bijie, Guizhou Province 551700
3.
Ningxia Meteorology Information Center, Yinchuan 750002

Funds: Open Project of the Institute of Tibetan Plateau and Polar Meteorology (Grant ITPP2021K01), Second Tibetan Plateau Scientific Expedition and Research (STEP) Program (Grant 2019QZKK0105), Key Program of National Natural Science Foundation of China (Grant 42030602)

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Received Date: December 20, 2021
Accepted Date: November 24, 2022
Available Online: December 25, 2022
Published Date: May 14, 2023

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Abstract

Abstract

The Tibetan Plateau (TP) vortex (TPV) is the main precipitation system in summer over the TP and downstream regions. This study analyzes a TPV case from 19 to 21 July 2013, based on high-resolution ERA5 reanalysis, the temperature of black body (TBB) obtained from the Fengyun-2E (FY-2E) satellite, and precipitation amount from TRMM (Tropical Rainfall Measurement Mission). The TPV case keeps active on the TP for about 56 h, which can be divided into three stages: Initial, development, and moving-out. Further, the roles of atmospheric heat sources in TPV during different stages and the related mechanisms are investigated. The results show that the TPV intensity increases with fluctuations. Furthermore, by diagnosing the potential vorticity (PV) tendency equation, it was found that the vertical gradient of diabatic heating is the main factor causing TPV development, i.e., a positive (negative) PV is produced below (above) the height where the maximum center of diabatic heating is situated, strengthening the low-level cyclonic and high-level anticyclonic circulations. Further analyses indicate that the atmospheric heat source increased with fluctuations, with the maximum value appearing at noon and the strongest in the moving-out stage. Notably, the formation of TPV is related to the surface warming center driven by surface sensible heat, while its enhancement is mainly dependent on the latent heat of condensation. Furthermore, the main contributor to the latent heat is analyzed as a vertical transport of water vapor that promotes TPV development.
- Tibetan Plateau vortex,
- Different development stages,
- Atmospheric heat source,
- Surface sensible heat,
- Latent heat

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References (37)

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