DOI: 10.1016/j.epsl.2019.115837
论文题名: Indian monsoon precipitation isotopes linked with high level cloud cover at local and regional scales
作者: Wang D. ; Tian L. ; Cai Z. ; Shao L. ; Guo X. ; Tian R. ; Li Y. ; Chen Y. ; Yuan C.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 529 语种: 英语
中文关键词: cloud cover
; convective activity
; precipitation isotopes
; regional scale
; southern Tibetan Plateau
英文关键词: Atmospheric pressure
; Atmospheric thermodynamics
; Isotopes
; Moisture
; Cloud cover
; Convective activity
; Convective precipitation
; Outgoing longwave radiation
; Paleoclimate reconstruction
; Regional scale
; Southern oscillation index
; Tibetan Plateau
; Precipitation (meteorology)
; cloud cover
; convective system
; hydrological cycle
; longwave radiation
; moisture transfer
; monsoon
; precipitation assessment
; Southern Oscillation
; stable isotope
; Barometric Pressure
; Convection
; Coverings
; Isotopes
; Moisture
; Precipitation
; Records
; Transport
; China
; Qinghai-Xizang Plateau
英文摘要: Precipitation stable isotopes preserve historic changes of evaporation in the source regions and precipitation processes, therefore, they can be used to reveal regional hydrological cycle dynamics and paleoclimate reconstructions. In monsoon regions, strong inverse impacts of convection on precipitation isotope ratios, have created a debate regarding the interpretation of isotope records as local climate proxies. The proportions of stratiform to convective precipitation on water isotopes, together with the influence mechanisms on seasonal and interannual scales remain highly uncertain. To further address the influence of precipitation patterns on water isotopes, we used 10 yrs of precipitation isotope data from the southern Tibetan Plateau (TP) to explore the effects of large-scale cloud cover and local climate on precipitation isotopes. Correlation analysis performed between local precipitation δ18O values and different level cloud data, indicated significant negative correlations between precipitation isotopes and high level cloud cover on both seasonal and interannual time scales. This result suggests that high-level convection in the upper moisture transport stream is a main control on precipitation isotopes in the southern TP. The clear and coherent variations of precipitation isotopes with the Southern Oscillation Index and outgoing longwave radiation confirmed that strong convection activity in the moisture source region and during transport significantly depleted heavy isotopes in vapor, producing substantially decreased precipitation δ18O in the study region. These results agree with earlier findings of tree ring cellulose isotope records that correlate with cloud cover, but we emphasized the important role of larger-scale regional cloud cover. We also delineated different maximum correlation zones for seasonal and interannual time scales, likely due to different mechanisms. These findings further improve the interpretation of paleoisotope records from the Indian summer monsoon region. © 2019 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165333
Appears in Collections: 气候变化与战略
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作者单位: Institute of International Rivers and Eco-security, Yunnan University, Kunming, Yunnan 650500, China; Yunnan Key Laboratory of International Rivers and Transboundary Eco-security, Kunming, 650500, China; CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing, 100101, China; Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, 100101, China
Recommended Citation:
Wang D.,Tian L.,Cai Z.,et al. Indian monsoon precipitation isotopes linked with high level cloud cover at local and regional scales[J]. Earth and Planetary Science Letters,2020-01-01,529