DOI: 10.1002/2014GL062302
论文题名: Deuterium excess in subtropical free troposphere water vapor: Continuous measurements from the Chajnantor Plateau, northern Chile
作者: Samuels-Crow K.E. ; Galewsky J. ; Sharp Z.D. ; Dennis K.J.
刊名: Geophysical Research Letters
ISSN: 0094-9535
EISSN: 1944-9266
出版年: 2014
卷: 41, 期: 23 起始页码: 8652
结束页码: 8659
语种: 英语
英文关键词: Atacama desert
; atmospheric water vapor
; Chajnantor Plateau
; deuterium excess
; subtropical humidity
Scopus关键词: Deuterium
; Forecasting
; Light measurement
; Mixing
; Spectroscopy
; Troposphere
; Water vapor
; Atacama Desert
; Atmospheric water vapor
; Cavity ring-down spectroscopy
; Chajnantor Plateau
; Continuous measurements
; Deuterium excess
; General circulation model
; Microphysical models
; Atmospheric humidity
; cloud microphysics
; deuterium
; general circulation model
; humidity
; mixing ratio
; plateau
; supersaturation
; troposphere
; water vapor
; Chile
英文摘要: Water vapor measured continuously by cavity ring-down spectroscopy from July 2012 to March 2013 on the hyperarid Chajnantor Plateau, northern Chile (elevation = 5080 m, pressure ≈ 550 hPa), has a mean deuterium excess (d-excess = δD - 8δ18O) of 46‰ ± 5‰ and frequently exceeds 100‰ at low water vapor mixing ratios (q ≤ 500 ppmv). These measurements provide empirical support for theoretical predictions of free troposphere d-excess. The d-excess measured at this site can be understood in terms of supersaturation with respect to ice at relative humidities between 100% and 130%, followed by mixing with moist midtropospheric or lower tropospheric air en route to the plateau. The d-excess measured at Chajnantor is consistent with predictions for d-excess in the upper troposphere from isotope-enabled general circulation models and with high vapor saturation over ice in cloud-resolving and microphysical models. © 2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84921556319&doi=10.1002%2f2014GL062302&partnerID=40&md5=3aa077582a65fafc881c07126c568014
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6799
Appears in Collections: 气候减缓与适应
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作者单位: Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM, United States
Recommended Citation:
Samuels-Crow K.E.,Galewsky J.,Sharp Z.D.,et al. Deuterium excess in subtropical free troposphere water vapor: Continuous measurements from the Chajnantor Plateau, northern Chile[J]. Geophysical Research Letters,2014-01-01,41(23).