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[1]SHEN Lulu,YANG Yanfen,WU Jing,et al.Spatial and Temporal Variation Characteristics of Extreme Climate Events in the Yellow River Basin[J].Research of Soil and Water Conservation,2022,29(02):231-242.

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Spatial and Temporal Variation Characteristics of Extreme Climate Events in the Yellow River Basin

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 29 Number of periods: 2022 02 Page number: 231-242 Column: Public date: 2022-03-20

Title:: Spatial and Temporal Variation Characteristics of Extreme Climate Events in the Yellow River Basin

Author(s):: SHEN Lulu¹, YANG Yanfen¹, WU Jing², BAI Lei³; (1.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China; 2.Lanzhou Central Meteorological Observatory, Lanzhou 730020, China; 3.College of Ecology and Environment, Hainan University, Haikou 570228, China)

Keywords:: extreme temperature; extreme precipitation; temporal and spatial distribution; Yellow River Basin

CLC:: P467

DOI:: -

Abstract:: Under the background of abnormal climate change, it is of great practical significance to study the temporal and spatial characteristics of extreme precipitation and temperature. The temporal and spatial variation characteristics of extreme climate events in the Yellow River Basin and its sub-regions were analyzed by using the international extreme climate event index based on the data of 284 meteorological stations from 1969 to 2018. The results show that: on the spatial scale, extreme maximum/minimum temperature, summer days and growing season length were greater in southeast and less in northwest of the Yellow River Basin, but the distribution of diurnal temperature range, frost days and ice days showed opposite trends; the high value area of warm spell duration indicator and cold spell duration indicator were located in the NSH(Northern Shaanxi)river system and IM(Inner Mongolia)river system, the low value area was located in the WH(Western Henan)river system; the spatial distribution of cool nights, warm nights, cool days and warm days were relatively uniform with small regional differences. Except for consecutive dry days, other extreme precipitation indices showed decreasing trends from southeast to northwest. On the temporal scale, the extreme temperature events such as extreme highest/lowest temperature, summer days, growing season length, warm days and warm nights showed increasing trends; all the indexes of the extreme low-temperature events such as frost days, ice days, cold nights and cold days presented the decreasing trends. The trend of extreme temperature index of seven sub-regions in the study area was consistent, and the stations with significant increase were mainly located in GN(Gansu and Ningxia)river system, IM river system and UYR(Upper stream of Yellow River)river system. Except for consecutive dry days, other extreme precipitation indices showed increasing trends. The stations with significant increase were mainly located in the UYR river system and NSH river system, and the NSH river system showed the most obvious increase trend. The stations with decreasing trend mainly distributed in the WR(Weihe River)river system and WH river system, but the decreasing trend was not significant. The stations where consecutive dry days decreased significantly and consecutive wet days increased significantly mainly concentrated in the UYR river system. On the whole, the temperature in the Yellow River Basin showed a rising trend, and the variation characteristics of extreme precipitation index showed the great spatial difference.

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Last Update: 2022-04-20