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SHEN Dongdong, RAN Lingkun, YANG Shuai, et al. 2023. Frontogenetic Analyses of the Topographic Frontal Rainstorm in Xinjiang [J]. Chinese Journal of Atmospheric Sciences (in Chinese), 47(6): 1843−1862. doi: 10.3878/j.issn.1006-9895.2203.21252
Citation: SHEN Dongdong, RAN Lingkun, YANG Shuai, et al. 2023. Frontogenetic Analyses of the Topographic Frontal Rainstorm in Xinjiang [J]. Chinese Journal of Atmospheric Sciences (in Chinese), 47(6): 1843−1862. doi: 10.3878/j.issn.1006-9895.2203.21252

Frontogenetic Analyses of the Topographic Frontal Rainstorm in Xinjiang

  • In this study, considering the complex topographic effect in Xinjiang and the condensation latent heat heating of the moist atmosphere near the frontal rainstorm area, (1) we obtain the thermodynamic frontogenesis functions under terrain-following coordinates based on the potential temperature, equivalent potential temperature, and generalized potential temperature, and the dynamic frontogenesis function driven by the deformation field. The advantages of frontogenesis functions in terrain-following coordinates while studying frontal processes in complex topographical regions are expounded. (2) We describe the advantages and disadvantages of the four frontogeneses from the perspective of the temperature and humidity gradient increase, which is the more crucial process during frontogenesis, and discover that the generalized potential temperature and deformation frontogenesis have a better correspondence with the precipitation process. Furthermore, (3) we conduct a numerical simulation of a frontal precipitation event, which propagates from north to south of Tianshan in Xinjiang, by using the WRF model and perform the analysis of the main forcing of the thermodynamic and dynamic frontogenesis functions, as well as their effect during the rainfall. The findings imply that dynamic frontogenesis plays an essential role in the precipitation triggering and weakening stage and is caused by energy conversion between vorticity, divergence, and deformation. Thermodynamic frontogenesis primarily acts on the precipitation development stage, and latent heating is the main force. In practical applications, the overlapping region of two frontogenesis functions in the near-surface layer and mid-lower troposphere could show the direction of future precipitation propagation.
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