气候变化研究进展2024，Vol.20Issue(5)：544-557,14.DOI:10.12006/j.issn.1673-1719.2024.097
1981-2023年雅鲁藏布江流域大气饱和水汽压差变化及影响因素
Spatio-temporal variation of vapor pressure deficit and impact factors in the Yalung Zangbo River basin from 1981 to 2023
摘要
Abstract
Vapor pressure deficit(VPD)reflects the atmospheric water demand,and clarifying the spatial and temporal characteristics of VPD is helpful to understand the response of regional atmospheric dryness and wetness to climate change.Based on the data of monthly sunshine duration,average temperature(Tm),average maximum temperature,average minimum temperature,precipitation(Pr),relative humidity,vapour pressure(e)and wind speed of 34 meteorological stations in the Yalung Zangbo River basin(YZRB)from 1981 to 2023,the spatio-temporal characteristics and influencing factors of VPD in YZRB during recent 43 years were analyzed by linear trend estimate,R/S analysis,Mann-Kendall method,Morlet wavelet analysis and stepwise regression method.The results show that:(1)The annual and seasonal VPD in YZRB were generally lower in the east and west,and higher in the middle.The monthly variation showed a bimodal pattern,with the 1st and 2nd peaks in June and October,respectively,and the minimum in January.VPD was the largest in summer,followed by spring,and the smallest in winter.(2)The annual VPD increased significantly with a rate of 0.030 kPa/(10 a),mainly in summer and autumn,especially in the last 23 years(2001-2023).The annual and seasonal VPD mutation occurred in the mid-to-late 2000s,and the possibility of continuous increase in the future is very high.The annual and seasonal VPD were lower in the 1980s and 1990s,especially in the 1990s.In the 2000s,due to the higher VPD in summer and winter,the annual VPD was higher.Annual and seasonal VPD were higher in the 2010s,mainly in summer and autumn.VPD had a significant 3-4 a cycle in spring,summer and autumn,2-3 a cycle in winter,and annual VPD had no significant cycle.(3)Seasonal/annual VPD had no significant linear relationship with geographical factors,but there was a very significant quadratic curve relationship between them.(4)The increase of annual and seasonal Tm was the dominant factor causing the increase of VPD.After 2004,the contribution of annual Tm and e to VPD decreased,and the role of Pr increased significantly.关键词
雅鲁藏布江/饱和水汽压差(VPD)/线性趋势/年代际变化/突变/周期Key words
Yalung Zangbo River basin(YZRB)/Vapor pressure deficit(VPD)/Linear trend/Inter-decadal change/Climate mutation/Cycle分类
天文与地球科学引用本文复制引用
杜军,高佳佳,陈涛,次旺,巴果卓玛..1981-2023年雅鲁藏布江流域大气饱和水汽压差变化及影响因素[J].气候变化研究进展,2024,20(5):544-557,14.基金项目
西藏自治区科技计划项目揭榜挂帅专项(XZ202303ZY0002G) （XZ202303ZY0002G）
