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Impacts of land-use data on the Simulation of Surface Air Temperature in Northwest China

Journal of Meteorological Research 2018年第6期32卷 896-908页

作者： Yaohui LI Cailing ZHAO Tiejun ZHANG Wei WANG Haixia DUAN Yuanpu LIU Yulong REN Zhaoxia PU Key Laboratory for Arid Climate Change and Disaster Reduction of Gansu Province Lanzhou Institute of Arid Meteorology/Northwestern Regional Center of Numerical Weather Prediction Key Open Laboratory for Arid Climate Change and Disaster Reduction of the China Meteorological Administration Department of Atmospheric Sciences University of Utah

This study examines the impacts of land-use data on the simulation of surface air temperature in Northwest China by the Weather Research and Forecasting(WRF) model. International Geosphere–Biosphere Program(IGBP) landuse data with 500-m spatial resolution are generated from Moderate Resolution Imaging Spectroradiometer(MODIS)satellite products. These data are used to replace the default U.S. Geological Survey(USGS) land-use data in the WRF model. Based on the data recorded by national basic meteorological observing stations in Northwest China, results are compared and evaluated. It is found that replacing the default USGS land-use data in the WRF model with the IGBP data improves the ability of the model to simulate surface air temperature in Northwest China in July and December 2015. Errors in the simulated daytime surface air temperature are reduced, while the results vary between seasons. There is some variation in the degree and range of impacts of land-use data on surface air temperature among seasons. Using the IGBP data, the simulated daytime surface air temperature in July 2015 improves at a relatively small number of stations, but to a relatively large degree; whereas the simulation of daytime surface air temperature in December 2015 improves at almost all stations, but only to a relatively small degree(within 1°C). Mitigation of daytime surface air temperature overestimation in July 2015 is influenced mainly by the change in ground heat flux. The modification of underestimated temperature comes mainly from the improvement of simulated net radiation in December 2015.

关键词： surface air temperature land-use data numerical simulation Northwest China

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Numerical Simulations of Impacts of Urbanization on Heavy Rainfall in Beijing Using Different land-use data

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Acta meteorologica Sinica 2007年第2期21卷 245-255页

作者：江晓燕刘伟东 Institute of Urban Meteorology CMA

A summer strong convective precipitation event on 10 July 2004 over Beijing is numerically simulated in this paper, and the impact of urban heat island （UHI） on summer convective rain is investigated. The analysis reveals that a mesoscaie convective cloud cluster system leads to this heavy rainfall event, suggesting the supply of moisture by the large scale circulation before the initiation of precipitation, a generally weaker UHI of 2-3℃ existed in the urban area. Much like a sea breeze, the anomalously warm urban air created relatively low pressure, inducing the inflow of cooler rural air towards the urban center, which is favorable to the ascending motion and the formation of convective precipitation over the urban area. In addition, the numerical simulation of the strong convective precipitation event suggests that the simulated result of precipitation using the 2002 landSAT-7 land-use data with 30-m resolution is much better than that using the 1992-1993 USGS land-use data with 1-km resolution, whether in the magnitude of rainfall or in the location of precipitation. The simulation confirms to some extent that the UHI has a significant role in causing extreme rainfall event.

关键词： urban heat island (UHI) heavy rainfall numerical simulation land-use data

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