DOI: 10.1002/2015JD023830
论文题名: Observational evidence of summer precipitation deficit-temperature coupling in China
作者: Zhang Q. ; Xiao M. ; Singh V.P. ; Liu L. ; Xu C.-Y.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2015
卷: 120, 期: 19 起始页码: 10040
结束页码: 10049
语种: 英语
英文关键词: standardized precipitation index
; summer precipitation
; temperature extremes
Scopus关键词: extreme event
; latent heat flux
; observational method
; precipitation (climatology)
; sensible heat flux
; soil moisture
; spatiotemporal analysis
; standardization
; summer
; surface temperature
; temperature profile
; transpiration
; water budget
; China
英文摘要: Partition of the energy between sensible heat and latent heat indicates that surface temperatures are affected by soil moisture deficits. Since transpiration by plants is the largest contributor to the land's total latent heat, the coupling of temperature and soil moisture will depend on the response of vegetation to soil moisture deficit and those are influenced by the soil moisture regimes. Utilizing daily precipitation and temperature data from China for a period of 1961-2010, this study computes average annual climatic water balance (AACWB) for defining soil moisture regimes and then quantitatively investigates the summer soil moisture-temperature coupling. With precipitation deficits (indicated by standardized precipitation index with the selected optimal timescale of 3 months) as proxy of soil moisture deficits, results indicate that the relationship between summer precipitation deficits and hot extremes tends to be enhanced when the negative AACWB draws closer toward zero while tends to be weakened with the increase of positive AACWB. For the region with the negative AACWB closing zero, the enhanced relationship should be attributed to the increase of the proportion of latent heat compared to the absorbed total energy. However, the weakened relationship with the increase of positive AACWB may be owing to the different responses of vegetation to precipitation deficit that the transpiration in the region with lower positive AACWB is less when responding to precipitation deficit. However, the physiological mechanisms behind vegetation response to soil moisture deficits still need to be further analyzed. By quantifying relevant biological and hydrological processes and their interaction, it is expected that the uncertainties in future climate scenarios be reduced, which would then allow the development of early warning and adaptation measures prior to the occurrence of hot extremes. Further, the summer precipitation deficit-temperature coupling is strongest along the strip stretching from southwest to northeast in China. ©2015. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63006
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Water Resources and Environment, Sun Yat-sen University, Guangzhou, China; Key Lab. of Water Cycle and Water Security in Southern China of Guangdong High Education Institute, Sun Yat-sen University, Guangzhou, China; Guangdong Provincial Key Laboratory of Urbanization and Geo-simulation, School of Geography and Planning, Sun Yat-sen University, Guangzhou, China; Department of Biological and Agricultural Engineering, Texas AandM University, College Station, TX, United States; Department of Geosciences and Hydrology, University of Oslo, Oslo, Norway
Recommended Citation:
Zhang Q.,Xiao M.,Singh V.P.,et al. Observational evidence of summer precipitation deficit-temperature coupling in China[J]. Journal of Geophysical Research: Atmospheres,2015-01-01,120(19)