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A meteorological drought index based on cumulative precipitation and cumulative evaporation
PAN Yongdi, XIAO Jingjing, PAN Yanhua, SHI Jie
Journal of Arid Meteorology, 2025 43 (1): 10
To overcome the limitation of traditional meteorological drought indices, which rely on historical climatic probability data of the same period for calculation, this paper establishes a meteorological drought index that can reflect the degree of soil drought but only requires current precipitation and evaporation data. Based on the soil water balance equation and in conjunction with the standard classification of soil drought levels, this study utilizes the relationship between the evaporation intensity of the dry soil surface layer and the water surface, along with soil evaporation calculation methods, to derive the expressions of the critical lines representing various drought levels withi. . .
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Characteristics of summer compound dry hot events in the main confluence area of the upper Yellow River and their impact on runoff
YANG Bocheng, LI Weiguo, LIU Xiaoyun, DONG Shenghu, GUI Qiang, GAN Zeliang, ZHENG Qiong
Journal of Arid Meteorology, 2025 43 (1): 20
Based on meteorological and hydrological observation and NCEP/NCAR (National Center for Environmental Prediction/National Center for Atmospheric Research) reanalysis data, the variation characteristics of compound dry and hot events, and their causes and impact on runoff in the main confluence area of the upper Yellow River in summer were analyzed. The results show that, from the average spatial distribution, the number of high temperature days in summer increases gradually from southwest to northeast in the main confluence area of the upper Yellow River, and the opposite is true for summer precipitation. From temporal and spatial distribution, the number of summer high temperature days in t. . .
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Study on the evolutionary characteristics of agricultural drought disasters and the relationship with climatic factors in Yunnan
ZHOU Jianqin, LI Meng, TAO Yun, DOU Xiaodong, WANG Yuyouting
Journal of Arid Meteorology, 2025 43 (1): 31
The study of the evolution characteristics of agricultural drought disasters and their relationship with climatic factors can identify the critical periods of the impact of climatic factors on drought disasters, reduce the losses caused by drought disasters effectively, and improve the technology and management level of drought disaster risk assessment. By using agricultural drought disaster data, precipitation, average temperature, and effective irrigation area data, this paper analyzed spatiotemporal distribution characteristics of agricultural drought disasters, studied the relationship between agricultural drought disasters and climatic factors, and constructed a drought disaster assessm. . .
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Characteristics of low-level wind during typical sudden precipitation processes at the northern foot of Qinling Mountains in midsummer
LIU Jiahuimin, LI Ming, OUYANG Yu, JI Qing, WANG Qingxia, LI Wenyao, LI Hanyu
Journal of Arid Meteorology, 2025 43 (1): 53
The changes of low-level wind field play an important role in the formation of sudden precipitation, which can change the flow field structure in the lower atmosphere, thereby affect the stability and vertical movement of the lower atmosphere and promote the development of convective clouds. Based on wind profile radar data at Chang’an Station, observation data, the fifth generation atmospheric reanalysis data released by the European Center for Medium Range Weather Forecasting, and Doppler radar data, this study analyzed the evolution characteristics of the low-level wind field during three typical sudden precipitation events under the control of the subtropical high at the northern foothil. . .
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Variation characteristics of hourly wind speed at lakeside and lake-land breeze in Dongting Lake
XIE Yijun, HUANG Jumei, YANG Wei, HUANG Tianci, WU Hao, YUAN Quan
Journal of Arid Meteorology, 2025 43 (1): 63
Understanding the variation characteristics and possible causes of lake-land breeze speed in Dongting Lake under large-scale climate background is of reference significance for the development and utilization of wind energy resources，water transportation and disaster prevention and reduction. The hourly wind direction and wind speed data at Yueyang Station from 1954 to 2021 are used to analyze the wind speed characteristics and long-term trends of the shoreline and lake-land wind by using the linear tendency estimation，Mann-Kendall mutation detection and sliding t-test methods. The results show that about the wind direction and wind speed characteristics of the four times，02：00，08：00 and 20：. . .
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Comparative analysis of characteristics and causes of summer extreme high temperatures in Zhejiang in 2022 and 2013
FU Yuan, LIU Hanhua, ZHOU Lingli, ZHAO Junping, MA Hao, LU Tingting, WEI Lei, XUAN Zhuolin
Journal of Arid Meteorology, 2025 43 (1): 87
The study on the causes of extreme hot weather in Zhejiang Province can provide scientific basis for the prediction and prevention of extreme hot weather. Based on conventional meteorological observations, the ERA5 reanalysis data from European Centre for Medium-Range Weather Forecasts, the outgoing long-wave radiation (OLR) data from National Oceanic and Atmospheric Administration, and daily climate system monitoring indices from the National Climate Center, this study compares and analyzes the spatial and temporal distribution and characteristics of two extreme high temperature events in Zhejiang Province in the summers of 2013 and 2022, and constructs a conceptual model of extreme hot wea. . .
