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Discussion papers
https://doi.org/10.5194/nhess-2019-335
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/nhess-2019-335
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 07 Jan 2020

Submitted as: research article | 07 Jan 2020

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This discussion paper is a preprint. It is a manuscript under review for the journal Natural Hazards and Earth System Sciences (NHESS).

Spatiotemporal Changes of Heat Waves and Extreme Temperatures in Main Cities of China from 1955 to 2014

Kuo Li and Gyilbag Amatus Kuo Li and Gyilbag Amatus
  • Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China

Abstract. In the past decades, severe heat waves have frequently occurred in many parts of the world. These conspicuous heat waves exerted terrible influences on human health, society, economy, agriculture, ecosystem and so on. Based on observed daily temperatures in China, an integrated index of heat waves and extreme temperature days was established involving the frequency, duration, intensity, and scale of these events across large cities in China. Heat waves and extreme temperature days showed increasing trend in most regions except Northwest China from 1955 to 2014. After late 1980s, the increasing trend was more obvious than the past decades. The cities in the middle and lower reaches of the Yangtse river were threatened by the most serious hot events in the past 60 years, especially Chongqing and Changsha. Due to the subtropical monsoon climate and special terrain, Chongqing would occupy the top of hot cities in a long period. In particular, there was obvious fluctuation for hot years in 31 cities, which were not continuously rising with the global warming; 21 cities mainly located in the eastern and southern regions of China had obvious rising trend; 8 cities had clear declining trend which mainly distributed in the western and northern regions of China; and there were no extreme temperature days in Kunming and Lasa in the past 60 years. The study revealed an obvious differentiation of hot events for 31 cities under climate change; hot threat in most cities is aggravating but declining or remained unchanged in the other cities. The trend is likely to intensify with global warming.

Kuo Li and Gyilbag Amatus
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Kuo Li and Gyilbag Amatus
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Short summary
In recent years, heat waves become more frequently in the whole world, such as Europe, Australia, China, America, who are suffered with huge loss of human health and natural resources. So we establish an integrated index of heat waves and extreme temperature days to provide unified standards for assessing heat waves and hot years in a new method. It makes a clear picture on the evolution and spatial distribution of heat waves and hot years in the whole China which is meaningful for common guys.
In recent years, heat waves become more frequently in the whole world, such as Europe,...
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