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Effects of urban land-use change in East China on the East Asian summer monsoon based on the CAM5.1 model

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Abstract

The effects of urban land-use change in East China on the East Asian summer monsoon (EASM) are investigated using a Community Atmosphere Model Version 5.1. The results show that the urban land-use change in East China causes spatially-varying changes in surface net radiation and heat fluxes, atmospheric circulation, and water budgets. It results in significant surface warming (cooling) and precipitation decrease (increase) in a large region north (south) of 30°N. Urban expansion agglomerated in (29°–41°N, 110°–122°E) alters the surface energy budget and warms the surface, resulting in strengthened southwesterly airflow south of 25°N and increased convergence below the mid-troposphere between 20° and 30°N. A concomitant northward downdraft associated with the increased convection generates an anomalous high pressure north of 30°N. Meanwhile, the downdraft not only produces adiabatic warming but also inhibits the dynamic condition for precipitation formation. The anomalous high pressure formed in North China prevents the southwesterly airflow from advancing northward, leading to increase the convergence and precipitation in South China. These changes reduce the meridional temperature gradient in the mid-lower troposphere and weaken the westerly airflow near 30°N. In addition, horizontal transport of vorticity north of 35°N weakens significantly, which leads to an anomalous barotropic structure of anticyclonic there. As a result, the anomalous anticyclonic circulation and descent north of 30°N are strengthened. At the same time, the anomalous cyclonic circulation and ascent south of 30°N are enhanced. These process induced by the thermal state changes due to urbanization weakens the EASM.

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Acknowledgments

We thank the editor and anonymous reviewers for their constructive comments. This study was jointly supported by the National Basic Research and Development (973) Program of China (2010CB428505), the State Key Program of National Natural Science Foundation of China (41230528), the Priority Academic Development of Jiangsu Higher Education Institutions (PAPD), and Jiangsu Provincial Qinglan Project. Thanks to Dr. Zuojun Yu for her careful review of the language and kindly help in improving the English.

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Correspondence to Zhihong Jiang.

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Ma, H., Jiang, Z., Song, J. et al. Effects of urban land-use change in East China on the East Asian summer monsoon based on the CAM5.1 model. Clim Dyn 46, 2977–2989 (2016). https://doi.org/10.1007/s00382-015-2745-4

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