DOI: 10.1002/2017JD027380
Scopus记录号: 2-s2.0-85040676366
论文题名: Seasonal and ENSO Influences on the Stable Isotopic Composition of Galápagos Precipitation
作者: Martin N.J. ; Conroy J.L. ; Noone D. ; Cobb K.M. ; Konecky B.L. ; Rea S.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 1 起始页码: 261
结束页码: 275
语种: 英语
英文关键词: ENSO
; Galápagos
; precipitation
; stable isotope
Scopus关键词: atmospheric convection
; boundary layer
; El Nino-Southern Oscillation
; isotopic composition
; marine environment
; oceanic convection
; oxygen isotope
; paleoclimate
; precipitation assessment
; sea surface temperature
; seasonal variation
; stable isotope
; water vapor
; Ecuador
; Galapagos Islands
; Pacific Ocean
; Pacific Ocean (Equatorial)
; Santa Cruz [Galapagos Islands]
英文摘要: The origin of stable isotopic variability in precipitation over time and space is critical to the interpretation of stable isotope-based paleoclimate proxies. In the eastern equatorial Pacific, modern stable isotope measurements in precipitation (δ18Op and δDp) are sparse and largely unevaluated in the literature, although insights from such analyses would benefit the interpretations of several regional isotope-based paleoclimate records. Here we present a new 3.5 year record of daily-resolved δ18Op and δDp from Santa Cruz, Galápagos. With a prior 13 year record of monthly δ18Op and δDp from the island, these new data reveal controls on the stable isotopic composition of regional precipitation on event to interannual time scales. Overall, we find Galápagos δ18Op is significantly correlated with precipitation amount on daily and monthly time scales. The majority of Galápagos rain events are drizzle, or garúa, derived from local marine boundary layer vapor, with corresponding high δ18Op values due to the local source and increased evaporation and equilibration of smaller drops with boundary layer vapor. On monthly time scales, only precipitation in very strong, warm season El Niño months has substantially lower δ18Op values, as the sea surface temperature threshold for deep convection (28°C) is only surpassed at these times. The 2015/2016 El Niño event did not produce strong precipitation or δ18Op anomalies due to the short period of warm SST anomalies, which did not extend into the peak of the warm season. Eastern Pacific proxy isotope records may be biased toward periods of high rainfall during strong to very strong El Niño events. ©2017. 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/114704
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Department of Geology, University of Illinois at Urbana-Champaign, Urbana, IL, United States; Department of Plant Biology, University of Illinois at Urbana-Champaign, Urbana, IL, United States; College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, United States; School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, United States; Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO, United States; Charles Darwin Research Station, Santa Cruz Island, Galápagos, Ecuador
Recommended Citation:
Martin N.J.,Conroy J.L.,Noone D.,et al. Seasonal and ENSO Influences on the Stable Isotopic Composition of Galápagos Precipitation[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(1)