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Projected change in East Asian summer monsoon by dynamic downscaling: Moisture budget analysis

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Abstract

The summer monsoon considerably affects water resource and natural hazards including flood and drought in East Asia, one of the world’s most densely populated area. In this study, we investigate future changes in summer precipitation over East Asia induced by global warming through dynamical downscaling with the Weather Research and Forecast model. We have selected a global model from the Coupled Model Intercomparison Project Phase 5 based on an objective evaluation for East Asian summer monsoon and applied its climate change under Representative Concentration Pathway 4.5 scenario to a pseudo global warming method. Unlike the previous studies that focused on a qualitative description of projected precipitation changes over East Asia, this study tried to identify the physical causes of the precipitation changes by analyzing a local moisture budget. Projected changes in precipitation over the eastern foothills area of Tibetan Plateau including Sichuan Basin and Yangtze River displayed a contrasting pattern: a decrease in its northern area and an increase in its southern area. A local moisture budget analysis indicated the precipitation increase over the southern area can be mainly attributed to an increase in horizontal wind convergence and surface evaporation. On the other hand, the precipitation decrease over the northern area can be largely explained by horizontal advection of dry air from the northern continent and by divergent wind flow. Regional changes in future precipitation in East Asia are likely to be attributed to different mechanisms which can be better resolved by regional dynamical downscaling.

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  1. Chun-Yong Jung

    Present address: Weather Information Service Engine, Center for Atmospheric Sciences and Earthquake Research, Seoul, 121-835, Korea

Authors and Affiliations

  1. Physical Oceanography Division, Korea Institute of Ocean Science and Technology, Ansan, Korea

    Chun-Yong Jung, Ho-Jeong Shin & Chan Joo Jang

  2. Climate Research Department, APEC Climate Center, Busan, Korea

    Hyung-Jin Kim

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  1. Chun-Yong Jung
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Correspondence to Chan Joo Jang.

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Jung, CY., Shin, HJ., Jang, C.J. et al. Projected change in East Asian summer monsoon by dynamic downscaling: Moisture budget analysis. Asia-Pacific J Atmos Sci 51, 77–89 (2015). https://doi.org/10.1007/s13143-015-0061-x

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