Characteristics and abnormal atmospheric circulation of regional high temperature process in 2017 over China

doi:10.12006/j.issn.1673-1719.2018.008

Abstract

Abstract:

Based on the comprehensive strength index of regional high temperature process, the daily maximum temperature of 2452 national stations from January 1961 to August 2017 and the NCEP/NCAR reanalysis data in 2017 were used to analyze the characteristics of regional high temperature process in 2017, as well as the formation mechanism of the second regional high temperature event in summer of 2017. In 2017, regional high temperature event over China showed features of high intensity, long duration, and large coverage. Under the background of climate warming, the maximum influence domain of the single regional high temperature process in China was extending obviously. In the early July of 2017, the powerful continental high pressure controlled the northern part of China, which caused the high temperature event with a wide range of influence and a long duration. In the late July, the vast southern region of China was under the control of the subtropical ridge. The strong downdraft and anti-cyclonic circulation made the atmosphere more stable, which finally led to the formation of high temperature weather.

Key words: Regional high temperature process, The summer of 2017, Formation mechanism

Guo-Fu WANG,Dian-Xiu YE,Ying-Xian ZHANG,Da-Peng HUANG,Wei HOU. Characteristics and abnormal atmospheric circulation of regional high temperature process in 2017 over China[J]. Climate Change Research, 2018, 14(4): 341-349.

Figures/Tables 13

Fig. 1 Inter-annual variation of regional high temperature process frequency from 1961 to 2017 over China.

Fig. 2 Inter-annual variation of the average duration of single regional high temperature process from 1961 to 2017 over China.

Fig. 3 Inter-annual variation of cumulative duration of regional high temperature process from 1961 to 2017 over China.

Fig. 4 Inter-annual variation of the maximum number of stations affected by single regional high temperature process from 1961 to 2017 over China.

Table 1 The top ten events based on the comprehensive intensity of regional high temperature process from 1961 to 2017 over China

Fig. 5 The anomaly of daily maximum temperature (a) and high temperature days (b) over China for the period of 7 to 17 July 2017 (relative to the period of 1981-2010).

Fig. 6 The extreme maximum temperature over China on 10 July 2017.

Fig. 7 The mean (a) and anomaly (b) of geopotential height on 500 hPa level over China for the period of 5 to 17 July 2017 (relative to the period of 1981-2010).

Fig. 8 The anomaly of geopotential height on 700 hPa (a) and 200 hPa (b) level over China for the period of 5 to 17 July 2017 (relative to the period of 1981-2010).

Fig. 9 The anomaly of daily maximum temperature (a) and high temperature days (b) over China for the period of 21 to 28 July 2017 (relative to the period of 1981-2010).

Fig. 10 The extreme maximum temperature over China on 24 July 2017.

Fig. 11 The mean of geopotential height on 500 hPa (a) and the anomaly of geopotential height on 700 hPa (b) level over China for the period of 21 to 25 July 2017 (relative to the period of 1981-2010 ).

Fig. 12 Latitude-height cross section of vertical wind speed along 110°E longitude over China for the period of 21 to 25 July 2017.

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