Projected change in extreme rainfall events in China by the end of the 21st century using CMIP5 models

Abstract

Projection of future climate changes and their regional impact is critical for long-term planning at the national and regional levels aimed at adaptation and mitigation. This study assesses the future changes in precipitation in China and the associated atmospheric circulation patterns using the Couple Model Intercomparison Project 5 Phase (CMIP5) simulations under the RCP4.5 and RCP8.5 scenarios. The results consistently indicate that the annual precipitation in China is projected to significantly increase at the end of the 21st century compared to the present-day levels. The number of days and the intensity of medium rain, large rain and heavy rain are obviously increased, while the number of trace rain days is projected to decrease over the entire area of China. Further analysis indicates that the significant increase of annual precipitation in Northwest China is primarily due to the increase of light rain and the increases in North and Northeast China are primarily due to the increase of medium rain. In the region of southern China, the increases of large rain and heavy rain play an important role in the increase of annual precipitation, while light rain events play a negative role. Analysis of the changes in atmospheric circulation indicates that the East Asian summer monsoon circulation is projected to be considerably stronger, and the local atmospheric stratification is projected to be more unstable, all of which provide a background benefit for the increase of precipitation and extreme rainfall events in China under global warming scenarios. CMIP5, precipitation, extreme rainfall, atmospheric circulation, projection Citation:Chen H P. Projected change in extreme rainfall events in China by the end of the 21st century using CMIP5 models. Chin Sci Bull, 2013, 58: 14621472, doi: 10.1007/s11434-012-5612-2The significant warming that has been observed globally over the past century has a high probability of being due to the increase in anthropogenic factors concentrating greenhouse gases. This significant warming has produced a significant impact on human society, ecosystems, and the environment, and this warming is capable of causing thousands of deaths and heavy economic losses. By the end of the 21st century, as reported in the Fourth Assessment Report of the Intergovernmental Panel on Climate Change (IPCC AR4), human society will become much more vulnerable as the consequences of continuous global warming, with global temperature increasing by 1.1-6.4°C relative to 1980-1999 [1]. Due to these future negative impacts, governments and the public alike have begun to pay increased attention to climate change under the global warming scenario.Modern global climate models that are capable of realistically simulating many aspects of the climate are the primary tools for determining the attribution of recent warming and for developing projections of future climate change. Researchers in China have taken a great deal of effort to study future climate change based on such model simulations, and some valuable and c...

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