Variation of Aridity Index and the Role of Climate Variables in the Southwest China
Li, Yanzhong1; Feng, Aiqing2; Liu, Wenbin3; Ma, Xieyao1; Dong, Guotao4
Source PublicationWATER
Corresponding AuthorFeng, Aiqing(aiqingfeng2011@163.com)
AbstractAridity index (AI), defined as the ratio of annual potential evapotranspiration to annual precipitation, has been widely applied in dividing climate regimes and monitoring drought events. Investigating variation of AI and the role of climate variables are thus of great significant for managing agricultural water resource and maintaining regional ecosystem stability. In this study, with the well-corrected precipitation records and the optimized parameters in estimating solar radiation, we investigated the variation of AI and its climatic attribution in the Southwest China using the observed climate records from 135 meteorological stations during the period of 1993-2015. The results showed that the AI increased significantly (0.0053 year(-1), p < 0.05) from 1993 to 2015 and abruptly increasing occurred around 2002. Approximately 85% of stations showed an increasing trend, while 24% of stations reached up to a significant increasing level, which demonstrated that the Southwest China was getting drier for the recent 20 years. Overall, the AI was most sensitive to maximum air temperature and precipitation with values of 1.11 and -1.00, respectively. The following factors are vapor pressure, solar radiation, minimum temperature, and wind speed. The declining precipitation and ascending maximum air temperature were the key variables in dominating the increase in aridity index during the period of 1993-2015, which contribute 38.98% and 36.26% of AI variation, respectively. Our results highlighted the influence of climate variability on aridity in the Southwest China.
Keywordaridity index reference evapotranspiration climate variability partial differential method Southwest China
Indexed BySCI
Funding ProjectNational Natural Science Foundation of China[41701019] ; National Natural Science Foundation of China[51779099] ; Startup Foundation for Introducing Talent of NUIST
Funding OrganizationNational Natural Science Foundation of China ; Startup Foundation for Introducing Talent of NUIST
WOS Research AreaWater Resources
WOS SubjectWater Resources
WOS IDWOS:000414707500020
PublisherMDPI AG
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorFeng, Aiqing
Affiliation1.Nanjing Univ Informat Sci & Technol, Coll Hydrometeorol, Nanjing 210044, Jiangsu, Peoples R China
2.China Meteorol Adm, Natl Climate Ctr, Beijing 100081, Peoples R China
3.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China
4.Yellow River Conservancy Commiss, Yellow River Inst Hydraul Res, Zhengzhou 450003, Henan, Peoples R China
Recommended Citation
GB/T 7714
Li, Yanzhong,Feng, Aiqing,Liu, Wenbin,et al. Variation of Aridity Index and the Role of Climate Variables in the Southwest China[J]. WATER,2017,9(10):14.
APA Li, Yanzhong,Feng, Aiqing,Liu, Wenbin,Ma, Xieyao,&Dong, Guotao.(2017).Variation of Aridity Index and the Role of Climate Variables in the Southwest China.WATER,9(10),14.
MLA Li, Yanzhong,et al."Variation of Aridity Index and the Role of Climate Variables in the Southwest China".WATER 9.10(2017):14.
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