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Home NEWS Science News

Quirky summer monsoon behaviors affect rainfall in East Asia

Bioengineer by Bioengineer
December 19, 2016
in Science News
Reading Time: 2 mins read
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In 2010, 28 regions in China suffered a five-month-long flood. This disaster resulted in over 4000 people dead or missing, and over 50 billion US dollars in property loss. In 1987, India experienced one of the worst droughts in history where almost all of North, East, and West India were affected. Over 300 million people were impacted.

These are some examples of extreme climate perils that motivate Renguang Wu to study monsoon behavior and predictability. Wu is a professor at the Institute of Atmospheric Physics, Chinese Academy of Sciences.

In the first issue of Advances in Atmospheric Sciences published in January 2017, Wu reviews the relationship between rainfall variations during the Indian and East Asian summer monsoons, the factors connecting these variations, and questions that researchers need to address. "Both India and China are countries that are subjected to large impacts of summer monsoon[s] that bring rainfall for agricultural production and water supply. [Insufficient] and excessive rainfall can lead to drought[s] and floods," he said.

One issue that concerns Wu is the weakening of the historically strong correlation between rainfall variations in India and East Asia. This observation indicates that the year-to-year summer rainfall variations in these regions are no longer closely related to each other. "This [change] is relevant to the prediction of summer rainfall over East Asia, which has been a difficult issue for decades," Wu explained.

One factor connecting these rainfall anomalies is two pathways that arise from the Indian summer monsoon due to abnormal heating in India. Termed the south and north pathways, they affect the atmospheric circulation, moisture transport, and precipitation over East Asia. These phenomena ultimately lead to rainfall anomalies in East Asia.

Wu is particularly interested in determining the efficacy of climate models for simulating the relationship between rainfall during Indian and East Asian summer monsoons. "I [plan] to address this [question using] available climate model simulations provided by the IPCC [Intergovernmental Panel on Climate Change] Coupled Model Intercomparison Project," said Wu. He also wants to further analyze daily rainfall data to understand intraseasonal rainfall fluctuations.

Wu hopes that his review will inspire researchers to further examine the relationship between rainfall variations during Indian and East Asian summer monsoons. Studies with detailed observational analyses and well-designed model experiments are crucial in improving our understanding of monsoon behaviors, as well as our ability to predict weather events during these seasons.

###

Established in February of 1928 (then called Institute of Meteorology of Academia Sinica), the Institute of Atmospheric Physics (IAP) was the very first and foremost research center carrying meteorological research in modern China. Today IAP has become a comprehensive atmospheric research institution, covering all aspects of atmospheric sciences.

The orientation and mission of IAP includes to study and explore the new laws of physical, chemical, biological and human processes happening in the Earth's atmosphere and in the interactions between atmosphere and surrounding environment; provide advanced theories, methods and technologies regarding monitoring, forecast and control of weather, climate and environment; cultivate top talented persons in this discipline; and serve the sustainable economic and social development and national security.

http://english.iap.cas.cn/

Media Contact

Zheng Lin
[email protected]

http://english.iap.cas.cn/

############

Story Source: Materials provided by Scienmag

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