Variation in Extreme Temperature and Its Instability in China

In this study, the instability of extreme temperatures is defined as the degree of perturbation of the spatial and temporal distribution of extreme temperatures, which is to show the uncertainty of the intensity and occurrence of extreme temperatures in China. Based on identifying the extreme temper...

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Bibliographic Details
Published in:Atmosphere
Main Authors: Chen, Hongju, Yang, Jianping, Ding, Yongjian, Tan, Chunping, He, Qingshan, Wang, Yanxia, Qin, Ji, Tang, Fan, Ge, Qiuling
Format: Report
Language:English
Published: MDPI 2022
Subjects:
temperature extremes
instability
atmospheric circulation
Entropy
China
CLIMATE-CHANGE
NORTH-ATLANTIC
AIR-TEMPERATURE
PROJECTION
INDEXES
EVENTS
OCEAN
Environmental Sciences & Ecology
Meteorology & Atmospheric Sciences
Environmental Sciences
North Atlantic
Online Access:http://ir.imde.ac.cn/handle/131551/56449
https://doi.org/10.3390/atmos13010019
Description
Summary:In this study, the instability of extreme temperatures is defined as the degree of perturbation of the spatial and temporal distribution of extreme temperatures, which is to show the uncertainty of the intensity and occurrence of extreme temperatures in China. Based on identifying the extreme temperatures and by analyzing their variability, we refer to the entropy value in the entropy weight method to study the instability of extreme temperatures. The results show that TXx (annual maximum value of daily maximum temperature) and TNn (annual minimum value of daily minimum temperature) in China increased at 0.18 degrees C/10 year and 0.52 degrees C/10 year, respectively, from 1966 to 2015. The interannual data of TXx' occurrence (CTXx) and TNn' occurrence (CTNn), which are used to identify the timing of extreme temperatures, advance at 0.538 d/10 year and 1.02 d/10 year, respectively. In summary, extreme low-temperature changes are more sensitive to global warming. The results of extreme temperature instability show that the relative instability region of TXx is located in the middle and lower reaches of the Yangtze River basin, and the relative instability region of TNn is concentrated in the Yangtze River, Yellow River, Langtang River source area and parts of Tibet. The relative instability region of CTXx instability is distributed between 105 degrees E and 120 degrees E south of the 30 degrees N latitude line, while the distribution of CTNn instability region is more scattered; the TXx's instability intensity is higher than TNn's, and CTXx's instability intensity is higher than CTNn's. We further investigate the factors affecting extreme climate instability. We also find that the increase in mean temperature and the change in the intensity of the El Nino phenomenon has significant effects on extreme temperature instability.

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