Projected Changes in Extreme High Temperature and Heat Stress in China

被引:0
|
作者
Xingcai Liu
Qiuhong Tang
Xuejun Zhang
Siao Sun
机构
[1] Chinese Academy of Sciences,Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research
[2] University of Chinese Academy of Sciences,Key Laboratory of Regional Sustainable Development Modeling, Institute of Geographic Sciences and Natural Resources Research
[3] Chinese Academy of Sciences,undefined
来源
Journal of Meteorological Research | 2018年 / 32卷
关键词
high temperature; wet-bulb globe temperature; heat stress; climate change;
D O I
暂无
中图分类号
学科分类号
摘要
High temperature accompanied with high humidity may result in unbearable and oppressive weather. In this study, future changes of extreme high temperature and heat stress in mainland China are examined based on daily maximum temperature (Tx) and daily maximum wet-bulb globe temperature (Tw). Tw has integrated the effects of both temperature and humidity. Future climate projections are derived from the bias-corrected climate data of five general circulation models under the Representative Concentration Pathways (RCPs) 2.6 and 8.5 scenarios. Changes of hot days and heat waves in July and August in the future (particularly for 2020–50 and 2070–99), relative to the baseline period (1981–2010), are estimated and analyzed. The results show that the future Tx and Tw of entire China will increase by 1.5–5°C on average around 2085 under different RCPs. Future increases in Tx and Tw exhibit high spatial heterogeneity, ranging from 1.2 to 6°C across different regions and RCPs. By around 2085, the mean duration of heat waves will increase by 5 days per annum under RCP8.5. According to Tx, heat waves will mostly occur in Northwest and Southeast China, whereas based on Tw estimates, heat waves will mostly occur over Southeast China and the mean heat wave duration will be much longer than those from Tx. The total extreme hot days (Tx or Tw > 35°C) will increase by 10–30 days. Southeast China will experience the severest heat stress in the near future as extreme high temperature and heat waves will occur more often in this region, which is particularly true when heat waves are assessed based on Tw. In comparison to those purely temperature-based indices, the index Tw provides a new perspective for heat stress assessment in China.
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页码:351 / 366
页数:15
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