干旱区典型城市湖泊影响局地气候效应的数值模拟研究

doi:10.13866/j.azr.2025.11.05

Abstract

Abstract:

To investigate the mechanisms by which urban lakes in arid regions locally regulate climate at extremely high temperatures, this study simulated a high-temperature event in the Yuehai Lake area of Yinchuan during July 29-30, 2021. Simulations were performed in the Weather Research and Forecasting (WRF) Community Land Model coupled model configured with four nested grids. The WRF_CLM model accurately characterized the diurnal temperature variations at the Yinchuan station and effectively reproduced the spatial distributions of physical fields such as the near-surface temperature field and wind field, demonstrating its suitability for simulating lake microclimates in arid regions. Under high-temperature conditions, Yuehai Lake, situated in an arid region, can effectively mitigate urban heat-island intensity through synergistic thermal and dynamic effects. The low humidity and strong radiation in the arid region significantly enhance evaporative cooling during the daytime; consequently, the 2-meter air temperature is approximately 4 ℃ lower near the lake than in the surrounding urban areas. During the nighttime, this temperature difference narrows to 1 ℃ because the strong radiative cooling effect over land combines with the thermal inertia of the cooled water body. This “stronger during the day, weaker at night” pattern reduces the diurnal temperature range in the lake area. Simultaneously, radiative evaporation raises the relative humidity in the lake area by 4%-12% from that in urban areas, with the humidity peaking on the downwind lakeshore. Furthermore, the lake-land thermal contrast effectively drives the lake-land breeze circulation. During the day, a horizontal divergence center forms over the lake surface and extends its influence to approximately 0.05 toward the lakeshore; vertically, it induces a closed circulation cell centered at an approximate height of 2200 meters, creating a core zone of specific humidity. At night, the evaporation weakens and the urban background wind system dominates the moisture diffusion, diminishing the local humidification effect around the lake. This study quantifies the local climatic effects of a typical lake in an arid region, providing a scientific basis for ecological urban planning.

Key words: WRF_CLM model, high temperature, lake-land breeze, climatic effect

WANG Fan, ZHU Xiaowei, GAO Ruina, SUN Yinchuan, HUANG Ying, JIANG Guoyong, LI Jiayao, XU Haoyang, Liu Yao. Numerical simulation study on the impact of typical trban lakes in arid regions on local climate effects[J].Arid Zone Research, 2025, 42(11): 2005-2017.

Figures/Tables 12

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参数	D01	D02	D03	D04
水平分辨率	9 km	3 km	1 km	333 m
微物理方案	WRF Double-moment 6-class scheme
长波辐射	RRTM scheme
短波辐射	Dudhia scheme
陆面过程	CLM 4.0
边界层	YSU scheme
近地面方案	Revised MM5 surface layer scheme
积云方案	无
湖泊方案	CLM 4.5 lake model
地形	24-category USGS-based land use data

Numerical simulation study on the impact of typical trban lakes in arid regions on local climate effects

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