Mr. Liang Zhang Profile

Liang Zhang

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Proceedings Article | 30 April 2024 Paper

Study on characteristics of low-level jets in planetary boundary layer based on wind profiling radar

Xuefeng Duan, Gang Sun, Liming Zhu, Hanjiu Zhang, Liang Zhang, Shengcheng Cui, Ningquan Weng

Proceedings Volume 13153, 131530Q (2024) https://doi.org/10.1117/12.3016901

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Using the continuous observation data of wind profiler radar, the temporal and spatial variation characteristics of wind direction and wind speed in the summer Boundary layer atmosphere wind field in the southern foot of Tianshan Mountains in Xinjiang are analyzed. The preliminary exploration of the impact of low-level jet streams on near surface atmospheric turbulence activity is of great significance for studying laser atmospheric transport, triggering convective weather, and atmospheric pollution and diffusion. Experimental area is located in a valley, and the circulation characteristics dominated by Mountain breeze and valley breeze are the basic characteristics of the daily variation of the wind field in the region, and also the main reason for the occurrence of low-level jet. Through statistics and analysis, it was found that the summer turbulent activity near the surface in this area is strong, which is caused by thermal stress on the underlying surface. During the day, the surface temperature is high, and there is a strong exchange of air flow near the surface with the upper layer, resulting in strong turbulent activity. In the evening, it may be the low-level jet that brings the horizontal wind shear near the ground, which intensifies the turbulence vortex activity and leads to the occurrence of turbulence.

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