DOI: 10.1002/2014GL061696
论文题名: Transformation of ENSO-related rainwater to dripwater δ18O variability by vadose water mixing
作者: Moerman J.W. ; Cobb K.M. ; Partin J.W. ; Meckler A.N. ; Carolin S.A. ; Adkins J.F. ; Lejau S. ; Malang J. ; Clark B. ; Tuen A.A.
刊名: Geophysical Research Letters
ISSN: 0094-9603
EISSN: 1944-9334
出版年: 2014
卷: 41, 期: 22 起始页码: 7907
结束页码: 7915
语种: 英语
英文关键词: cave dripwater
; forward modeling
; karst hydrology
; water isotopes
Scopus关键词: Atmospheric pressure
; Caves
; Climatology
; Hydrogeology
; Isotopes
; Mixing
; Time series
; Forward modeling
; Hydrological process
; Karst hydrology
; Oxygen isotopes
; Residence time
; Southern oscillation
; Transformation process
; Water isotope
; Rain
; amplitude
; annual variation
; El Nino-Southern Oscillation
; karst
; oxygen isotope
; rainfall
; rainwater
; reconstruction
; speleothem
; stalagmite
; transformation
; uncertainty analysis
; vadose zone
英文摘要: Speleothem oxygen isotopes (δ18O) are often used to reconstruct past rainfall δ18O variability, and thereby hydroclimate changes, in many regions of the world. However, poor constraints on the karst hydrological processes that transform rainfall signals into cave dripwater add significant uncertainty to interpretations of speleothem-based reconstructions. Here we present several 6.5 year, biweekly dripwater δ18O time series from northern Borneo and compare them to local rainfall δ18O variability. We demonstrate that vadose water mixing is the primary rainfall-to-dripwater transformation process at our site, where dripwater δ18O reflects amount-weighted rainfall δ18O integrated over the previous 3-10 months. We document large interannual dripwater δ18O variability related to the El Niño-Southern Oscillation (ENSO), with amplitudes inversely correlated to dripwater residence times. According to a simple stalagmite forward model, asymmetrical ENSO extremes produce significant offsets in stalagmite δ18O time series given different dripwater residence times. Our study highlights the utility of generating multiyear, paired time series of rainfall and dripwater δ18O to aid interpretations of stalagmite δ18O reconstructions. © 2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84923075639&doi=10.1002%2f2014GL061696&partnerID=40&md5=f70513458145cac79fb14a4a60d055ea
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6867
Appears in Collections: 气候减缓与适应
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作者单位: School of Earth and Atmospheric Sciences, Georgia Institute of Technology Georgia, Atlanta, GA, United States
Recommended Citation:
Moerman J.W.,Cobb K.M.,Partin J.W.,et al. Transformation of ENSO-related rainwater to dripwater δ18O variability by vadose water mixing[J]. Geophysical Research Letters,2014-01-01,41(22).