Have China's drylands become wetting in the past 50 years?
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Have China's drylands become wetting in the past 50 years? / Zhang, Yu; Zhang, Yangjian; Cheng, Liang; Cong, Nan; Zheng, Zhoutao; Huang, Ke; Zhang, Jianshuang; Zhu, Yixuan; Gao, Jie; Sun, Yihan.
I: Journal of Geographical Sciences, Bind 33, Nr. 1, 2023, s. 99-120.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Have China's drylands become wetting in the past 50 years?
AU - Zhang, Yu
AU - Zhang, Yangjian
AU - Cheng, Liang
AU - Cong, Nan
AU - Zheng, Zhoutao
AU - Huang, Ke
AU - Zhang, Jianshuang
AU - Zhu, Yixuan
AU - Gao, Jie
AU - Sun, Yihan
PY - 2023
Y1 - 2023
N2 - Recently, whether drylands of Northwest China (NW) have become wetting has been attracting surging attentions. By comparing the Standard Precipitation Evapotranspiration Indices (SPEI) derived from two different potential evapotranspiration estimates, i.e., the Thornthwaite algorithm (SPEI_th) and the Penman-Monteith equation (SPEI_pm), we try to resolve the controversy. The analysis indicated that air temperature has been warming significantly at a rate of 0.4? decade(-1) in the last five decades and the more arid areas are more prone to becoming warmer. Annual precipitation of the entire study area increased insignificantly by 3.6 mm decade(-1) from 1970 to 2019 but NW presented significantly increasing trends. Further, the SPEI_th and SPEI_pm demonstrated similar wetting-drying-wetting trends (three phases) in China's drylands during 1970-2019. The common periodical signals in the middle phase were identified both by SPEI_th and SPEI_pm wavelet analysis. Analysis with different temporal intervals can lead to divergent or even opposite results. The attribution analysis revealed that precipitation is the main climatic factor driving the drought trend transition. This study hints that the wetting trend's direction and magnitude hinge on the targeted temporal periods and regions.
AB - Recently, whether drylands of Northwest China (NW) have become wetting has been attracting surging attentions. By comparing the Standard Precipitation Evapotranspiration Indices (SPEI) derived from two different potential evapotranspiration estimates, i.e., the Thornthwaite algorithm (SPEI_th) and the Penman-Monteith equation (SPEI_pm), we try to resolve the controversy. The analysis indicated that air temperature has been warming significantly at a rate of 0.4? decade(-1) in the last five decades and the more arid areas are more prone to becoming warmer. Annual precipitation of the entire study area increased insignificantly by 3.6 mm decade(-1) from 1970 to 2019 but NW presented significantly increasing trends. Further, the SPEI_th and SPEI_pm demonstrated similar wetting-drying-wetting trends (three phases) in China's drylands during 1970-2019. The common periodical signals in the middle phase were identified both by SPEI_th and SPEI_pm wavelet analysis. Analysis with different temporal intervals can lead to divergent or even opposite results. The attribution analysis revealed that precipitation is the main climatic factor driving the drought trend transition. This study hints that the wetting trend's direction and magnitude hinge on the targeted temporal periods and regions.
KW - China
KW - drylands
KW - drying or wetting trend
KW - Standard Precipitation Evapotranspiration Index (SPEI)
KW - drought
KW - aridity
KW - ASIAN SUMMER MONSOON
KW - POTENTIAL EVAPOTRANSPIRATION
KW - WAVELET COHERENCE
KW - CLIMATE-CHANGE
KW - DROUGHT
KW - PRECIPITATION
KW - TRENDS
KW - DRY
KW - CLASSIFICATION
KW - VARIABILITY
U2 - 10.1007/s11442-022-2067-5
DO - 10.1007/s11442-022-2067-5
M3 - Journal article
VL - 33
SP - 99
EP - 120
JO - Journal of Chinese Geography
JF - Journal of Chinese Geography
SN - 0375-5444
IS - 1
ER -
ID: 334398981