Near-surface wind field characteristics of the desert-oasis transition zone in Dunhuang,China  

作　　者：PAN Jiapeng ZHANG Kecun AN Zhishan ZHANG Yu 

机构地区：[1]Key Laboratory of Desert and Desertification&Dunhuang Gobi and Desert Ecology and Environment Research Station,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China [2]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Journal of Arid Land》2024年第5期654-667,共14页干旱区科学（英文版）

基　　金：the National Key Research and Development Program of China(2020YFA0608403);the National Natural Science Foundation of China(42171083);the Natural Science Foundation of Gansu Province,China(23JRRA601).

摘　　要：The desert-oasis transition zone(DOTZ)serves as a buffer area between the desert and oasis.Understanding its wind field characteristics is of great significance for the prevention and control of aeolian disasters in the oasis.In this study,we used meteorological data during 2013–2019 from the portable meteorological stations at five sites(site A on the edge of the oasis,sites B,C,and D in the DOTZ,and site O in the desert)in Dunhuang,China to analyze the near-surface wind field characteristics and their causes,as well as to reveal the key role of the DOTZ in oasis protection.The results showed that the mean wind speed,frequency of sand-driving wind,and directional variability of wind decreased from west to east within the DOTZ,and wind speed was significantly affected by air temperature.The terrain influenced the prevailing winds in the region,mainly from northeast and southwest.Only some areas adjacent to the oasis were controlled by southeasterly wind.This indicated that the near-surface wind field characteristics of the DOTZ were caused by the combined effects of local terrain and surface hydrothermal difference.At site D,the annual drift potential(DP)was 24.95 vector units(VU),indicating a low wind energy environment,and the resultant drift direction(RDD)showed obvious seasonal differences.Additionally,the DOTZ played an important buffering role between the desert and oasis.Compared with the desert,the mean wind speed in the oasis decreased by 64.98%,and the prevailing wind direction was more concentrated.The results of this study will be useful in interpreting the aeolian activity of the DOTZ in Dunhuang.

关 键 词：desert-oasis transition zone near-surface wind field hydrothermal difference sand-driving wind aeolian environment Dunhuang 

分 类 号：P425.6[天文地球—大气科学及气象学] X171.4[环境科学与工程—环境科学]