干旱区地理2023，Vol.46Issue(12)：1939-1950,12.DOI:10.12118/j.issn.1000-6060.2023.105
1955-2021年黄土高原地区相对湿度时空演变规律
Temporal and spatial evolution of relative humidity in the Loess Plateau during 1955-2021
摘要
Abstract
The Loess Plateau,a region in China that is highly sensitive to climate change,serves as a focal point for investigating the spatiotemporal evolution of relative humidity(RH).Understanding the interplay between RH and geographical and meteorological factors is essential for comprehending the climate change dynamics within the plateau.This study leverages daily RH observations from 90 meteorological stations in the Loess Pla-teau and its environs to analyze the temporal and spatial variations in RH from 1960 to 2021,both before and af-ter the implementation of ecological initiatives such as the conversion project of farmland to forest and grass.Us-ing trend analysis,sensitivity analysis,and spatial interpolation,we unveil the following findings:(1)The aver-age annual RH in the Loess Plateau exhibited a notable decrease of-0.376%·(10a)-1(P<0.05)from 1955 to 2021,undergoing a decadal variation characterized by a"weakening-strengthening-weakening"process.While autumn experienced a slight increase,all other seasons displayed a declining trend,with the most pronounced de-crease observed in spring[-0.945%·(10a)-1]and the least in winter[-0.194%·(10a)-1].(2)Spatially,the winter average RH in the Loess Plateau peaked in the south,gradually diminishing from east to west in the central and northern regions.Conversely,other time series demonstrated a gradual decline from south to north.The spatial patterns of the annual and seasonal average RH variation trends in the Loess Plateau were different.(3)Postimple-mentation of the ecological project,the average RH throughout the year,as well as in spring,summer,and winter,exhibited varying degrees of decrease.The trends in annual,summer,and winter RH shifted from an increasing to a decreasing trajectory.Noteworthy differences emerged in the spatial distribution characteristics of annual and seasonal average RH,coupled with their respective trend changes.The prevailing trend change combination type for all temporal RH patterns was consistently low.(4)The primary seasonal factor influencing long-term changes in annual RH in the Loess Plateau is spring,with spatial dominance primarily by a single dominant type in spring and a combination of dominant types in spring and summer.(5)The annual and seasonal average RH in the Loess Plateau demonstrated a significant negative correlation with latitude(P<0.01)and a positive correlation with pre-cipitation(P<0.01).The geographical factors exerted the most significant influence on summer average RH.An-nual,spring,and summer average RH were most sensitive to average temperature,whereas autumn and winter were most responsive to wind speed.关键词
相对湿度(RH)/年代际变化/季节贡献率/敏感性分析/生态工程实施/黄土高原Key words
relative humidity(RH)/interdecadal variation/seasonal contribution rate/sensitivity analysis/the implementation of ecological project/the Loess Plateau引用本文复制引用
安彬,肖薇薇,刘宇峰,刘全玉..1955-2021年黄土高原地区相对湿度时空演变规律[J].干旱区地理,2023,46(12):1939-1950,12.基金项目
陕西省科技厅项目(2021KRM033) （2021KRM033）
陕西教育厅项目(22JK0233,18JK0016) （22JK0233,18JK0016）
安康学院校级项目(2021AYKFKT03)资助 （2021AYKFKT03）
