Analysis of Continuous High Temperature Process and Its Anomalous Atmospheric Circulation Characteristics over Gansu Province in August 2016

YE Peilong; LIU Xinwei; ZHAO Wenjing; YANG Xiaojun; LI Yan; LIU Weiping

doi:10.7522/j.issn.1000-0534.2019.00006

2019 , Vol. 38 >Issue 6: 1283 - 1292

DOI: https://doi.org/10.7522/j.issn.1000-0534.2019.00006

Analysis of Continuous High Temperature Process and Its Anomalous Atmospheric Circulation Characteristics over Gansu Province in August 2016

YE Peilong ,
LIU Xinwei ,
ZHAO Wenjing ,
YANG Xiaojun ,
LI Yan ,
LIU Weiping

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Lanzhou Center Meteorological Observatory, Lanzhou 730020, Gansu, China;Gansu Meteorological Service Center, Lanzhou 730020, Gansu, China;College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, Gansu, China;Northwest Regional Climate Center, Lanzhou 730020, Gansu, China

Received date: 2018-07-18

Online published: 2019-12-28

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Abstract

Based on the daily temperature data at 81 stations of Gansu province and the NCEP/NCAR reanalysis data from 1960 to 2016, the general characteristics and the possible anomalous atmospheric circulation effect of continuous heat wave occurred in Gansu province during the August of 2016 had been analyzed and investigated. The results were shown as follows:(1) The number of high temperature days was significantly more than the historical average during the summer of 2016, and most stations in eastern of Gansu province increased by about 5 days; in particular, the high temperature process from the end of July to the late August, which was rarely occurred in history no matter the intensity or the range of high temperature. (2) The South Asia High became stronger and the center position located to 5~10 degree north to the average, South Asia High center slightly shifted to the east, thus, the cold air was not conducive to move towards South areas. The East Asia Subtropical westerly jet was significantly strong and shifted to the North, about 3~5 degree north, meanwhile, its distribution pattern changed from latitudinal to meridional, enhanced the downdraft on south of jet axis, which played an important role in the maintenance and development of high temperature. (3) Affected by the anomalous South Asia High and East Asia Subtropical westerly jet, the continental warm high pressure was extremely strong and stable, meanwhile, the frequency of Ural blocking was about more than 10 days, and the meridional pattern inhibited the eastward movement of ridge-trough system, which was difficult to form effective cooling and precipitation weather. (4) Although the moisture was twenty percent more than normal, particularly in western region, the moisture divergence was strong, therefore, it is difficult to form the effective precipitation; in addition, the downdraft was more significant than the average, caused the warmer air by descending draft in the middle and upper stratosphere, which was conducive to develop and maintain the high temperature weather. Based on the daily temperature data at 81 stations of Gansu province and the NCEP/NCAR reanalysis data from 1960 to 2016, the general characteristics and the possible anomalous atmospheric circulation effect of continuous heat wave occurred in Gansu province during the August of 2016 had been analyzed and investigated. The results were shown as follows:(1) The number of high temperature days was significantly more than the historical average during the summer of 2016, and most stations in eastern of Gansu province increased by about 5 days; in particular, the high temperature process from the end of July to the late August, which was rarely occurred in history no matter the intensity or the range of high temperature. (2) The South Asia High became stronger and the center position located to 5~10 degree north to the average, South Asia High center slightly shifted to the east, thus, the cold air was not conducive to move towards South areas. The East Asia Subtropical westerly jet was significantly strong and shifted to the North, about 3~5 degree north, meanwhile, its distribution pattern changed from latitudinal to meridional, enhanced the downdraft on south of jet axis, which played an important role in the maintenance and development of high temperature. (3) Affected by the anomalous South Asia High and East Asia Subtropical westerly jet, the continental warm high pressure was extremely strong and stable, meanwhile, the frequency of Ural blocking was about more than 10 days, and the meridional pattern inhibited the eastward movement of ridge-trough system, which was difficult to form effective cooling and precipitation weather. (4) Although the moisture was twenty percent more than normal, particularly in western region, the moisture divergence was strong, therefore, it is difficult to form the effective precipitation; in addition, the downdraft was more significant than the average, caused the warmer air by descending draft in the middle and upper stratosphere, which was conducive to develop and maintain the high temperature weather.

Key words： Gansu province; high temperature wea; anomalous atmospheri; South Asian High

Cite this article

YE Peilong , LIU Xinwei , ZHAO Wenjing , YANG Xiaojun , LI Yan , LIU Weiping . Analysis of Continuous High Temperature Process and Its Anomalous Atmospheric Circulation Characteristics over Gansu Province in August 2016[J]. Plateau Meteorology, 2019 , 38(6) : 1283 -1292 . DOI: 10.7522/j.issn.1000-0534.2019.00006

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