DOI: 10.1002/2015GL067605
论文题名: Isotopic evidence for lateral flow and diffusive transport, but not sublimation, in a sloped seasonal snowpack, Idaho, USA
作者: Evans S.L. ; Flores A.N. ; Heilig A. ; Kohn M.J. ; Marshall H.-P. ; McNamara J.P.
刊名: Geophysical Research Letters
ISSN: 0094-9174
EISSN: 1944-8905
出版年: 2016
卷: 43, 期: 7 起始页码: 3298
结束页码: 3306
语种: 英语
英文关键词: hydrograph
; ice core
; snow
; stable isotope
Scopus关键词: Snow
; Stratigraphy
; Diffusive transport
; Hydrograph separation
; Hydrographs
; Ice core
; Orders of magnitude
; Oxygen and hydrogen isotopes
; Seasonal snowpack
; Stable isotopes
; Isotopes
英文摘要: Oxygen and hydrogen isotopes in snow were measured in weekly profiles during the growth and decline of a sloped subalpine snowpack, southern Idaho, 2011-2012. Isotopic steps (10‰, δ18O; 80‰, δD) were preserved relative to physical markers throughout the season, albeit with some diffusive smoothing. Melting stripped off upper layers without shifting isotopes within the snowpack. Meltwater is in isotopic equilibrium with snow at the top but not with snow at each respective collection height. Transport of meltwater occurred primarily along pipes and lateral flow paths allowing the snowpack to melt initially in reverse stratigraphic order. Isotope diffusivities are ∼2 orders of magnitude faster than estimated from experiments but can be explained by higher temperature and porosity. A better understanding of how snowmelt isotopes change during meltout improves hydrograph separation methods, whereas constraints on isotope diffusivities under warm conditions improve models of ice core records in low-latitude settings. © 2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84962635300&doi=10.1002%2f2015GL067605&partnerID=40&md5=7a48f3368d750e417570c5e8e7b80b46
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10137
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Geosciences, Boise State University, Boise, ID, United States
Recommended Citation:
Evans S.L.,Flores A.N.,Heilig A.,et al. Isotopic evidence for lateral flow and diffusive transport, but not sublimation, in a sloped seasonal snowpack, Idaho, USA[J]. Geophysical Research Letters,2016-01-01,43(7).