-
Local enhanced convective environment characteristics of an extreme rainstorm event in arid region of Northwest China
FU Zhao, LIU Weicheng, SONG Xingyu, XU Lili, SHA Honge, MA Li, CUI Yu
Journal of Arid Meteorology, 2022 40 (6): 921
Extreme precipitation events in arid areas often lead to huge casualties and economic losses, the study on its evolution characteristics and formation mechanism can provide an important support for improving the accuracy of weather forecast. A rainstorm process occurred on 13 August 2022 in Jinta County of Gansu Province, which was located in arid region of Northwest China. Both daily precipitation and hourly precipitation broke through the historical extreme value at national meteorological station Hexi Corridor, and their extreme and local characteristics were significant. European Centre for Medium-Range Weather Forecasts (ECMWF) fifth-generation global atmospheric reanalysis (ERA5) and o. . .
-
Analysis on precipitation extremity of a torrential rain event in semi-arid region of eastern Gansu
ZHANG Junxia, HUANG Wubin, YANG Xiumei, LIU Weicheng, ZHOU Zihan, SHA Honge
Journal of Arid Meteorology, 2022 40 (6): 932
An extremely heavy rainstorm occurred on 14-15 July 2022 in Longdong, Gansu Province, which is located in semi-arid region, the daily rainfall and hourly rainfall intensity at several stations broke the historical extreme values. Based on the minutely and hourly precipitation observation data from 20:00 BST 14 to 20:00 BST 15 July 2022, the daily and hourly precipitation data from 192 regional meteorological stations since the establishment of them in Qingyang of Gansu Province, and the CMPAS (CMA Multi-source Merged Precipitation Analysis System) 10-minute and hourly precipitation data, the precipitation characteristics and extremity of the torrential rain event are analyzed. The results sh. . .
-
Mechanism of trigger and maintenance during an extremely torrential rain in semi-arid region of eastern Northwest China
SHA Honge, FU Zhao, LIU Weicheng, XU Lili, LIU Na, LIU Xinyu, MA Yihao
Journal of Arid Meteorology, 2022 40 (6): 944
A torrential rain struck Qingyang on July 15, 2022, which is located in semi-arid region of eastern Northwest China, causing the daily rainfall and hourly rainfall at several stations to exceed the historical extreme values. The formation mechanism of the torrential rain in semi-arid region of Northwest China is analyzed based on multi-source observation data and ERA5 reanalysis data, so as to provide some useful reference for rainstorm forecast in arid and semi-arid areas. The results show that the torrential rain process occurred under the background of weak synoptic scale baroclinic forcing, weak unstable energy and deep wet layer in the complex terrain of the Loess Plateau, with characte. . .
-
Research on spatio-temporal distribution characteristics of short-term heavy rainfall and terrain influence in the Loess Plateau arid region of eastern Gansu
YANG Lijie, CAO Yanchao, LIU Weicheng, XU Lili, ZHANG Hongfen, SUN Zizhu
Journal of Arid Meteorology, 2022 40 (6): 953
Based on the hourly precipitation data from 302 regional automatic weather stations in the Loess Plateau arid region of eastern Gansu from 2013 to 2020, digital elevation model data from shuttle radar topography mission and ERA5 reanalysis data of European Centre for Medium-Range Weather Forecasts, etc., the spatio-temporal distribution characteristics of short-term heavy rainfall are analyzed, and on this basis that the relationship between it and topography, geography factors is discussed. Then combined with an extremely short-term heavy rainfall event in 2021, the influence mechanism of terrain is summarized. The results are as follows: (1) The short-term heavy rainfall mainly occurs in s. . .
-
Characteristics of dry and wet changes in sunflower growing areas in northern China and their causes from 1961 to 2020
WANG Xiaochen, MA Xueqing, HE Huayun, REN Siqi, TANG Shuyue, ZHAO Jinyuan, PAN Zhihua, WANG Jing, PAN Xuebiao, HU Qi
Journal of Arid Meteorology, 2022 40 (6): 1041
The sunflower growing region in northern China is mainly located in arid and semi-arid areas, and the yield is governed by wet and dry conditions. The non-homogeneous variation of water resources between different regions in the context of climate change has increased uncertainty of sunflower production. Based on daily meteorological data from 296 stations in the sunflower growing region in northern China, the wetness index and standardized precipitation evapotranspiration index (SPEI) calculated on the basis of precipitation and crop evapotranspiration are used to analyze the spatial and temporal characteristics of dry and wet conditions and the influence of major meteorological factors on . . .
-
Response difference of fractional vegetation cover and net primary productivity to SPEI drought index in karst areas of Guangxi
CHEN Yanli, TANG Meirong, ZHANG Hui, MO Jianfei, QIAN Shuan
Journal of Arid Meteorology, 2022 40 (6): 1050
Drought is one of the most important meteorological disasters affecting vegetation in karst areas of Guangxi, and a reasonable remote sensing vegetation parameter can address the impact of drought on vegetation more objectively. To quantify the response of vegetation to drought, fractional vegetation cover (FVC) and net primary productivity (NPP) were selected to analyze the responses to standardized precipitation evapotranspiration index (SPEI) under different topography conditions and forest species. The results are as follows: (1) The responses of FVC and NPP to SPEI were significantly different in karst areas of Guangxi. The response of FVC and NPP to SPEI showed the highest consistency . . .
