Analysis of the Atmospheric Boundary Layer Vertical Structure in Chongqing on Summer Afternoon

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  • 1. Chongqing Climate CenterChongqing 401147
    2. Chongqing Meitian Technology Co. LtdChongqing 401121
    3. CMA Economic Transformation of Climate Resources Key LaboratoryChongqing 401147
    4. Chongqing Meteorological ObservatoryChongqing 401147

Online published: 2025-06-16

Abstract

In this paperthe vertical structure of the atmospheric boundary layer in Chongqing on summer after‐ noon is analyzed using the sounding data with intensive observation. The general features of the vertical structure of the atmospheric boundary layer under different weather conditions are also given. The results show that the atmospheric boundary layer depicts a typical convective boundary layer structure under clear and cloudy conditions. On clear daysthe development of convective boundary layer is very vigorousthe surface transpiration/ evaporation is strongand there is obvious upward water vapor transport. The near-surface superinsulation layer is thickand the potential temperature lapse rate is large. The height of the boundary layer can reach 1. 5 km on average and up to 2. 1 kmwhile the height under cloudy conditions is relatively lowwith an average height of 1. 0 km. Under sunny and cloudy conditionsthe wind speed in the boundary layer is generally low with the values less than 5. 0 m·s-1. On cloudy daysthe atmospheric boundary layer presents a classic morning boundary layer structurewhich means that there is a stable boundary layer and a residual mixed layer between the convective boundary layer and the entrainment layer. Under this conditionthe thickness of the convective boundary lay‐ er is relatively lowwith a magnitude of less than 0. 8 km. The specific humidity profile presents a feature oppo‐ site to the potential temperature profileand the boundary layer wind speed is relatively low. When it rainsthe potential temperature depicts a neutral stratification feature and shows no obvious convective boundary layer structure. Due to the influence of different weather systems and processesthe characteristics of specific humidity and wind profiles are relatively complex and changeable.

Cite this article

JIANG Ping, ZHAI Danhua, ZHU Haonan, WU Yao, ZHANG Fen . Analysis of the Atmospheric Boundary Layer Vertical Structure in Chongqing on Summer Afternoon[J]. Plateau Meteorology, 0 : 1 . DOI: 10.7522/j.issn.1000-0534.2025.00009

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