DOI: 10.1002/2015GL064218
论文题名: Effects of postdepositional processing on nitrogen isotopes of nitrate in the Greenland Ice Sheet Project 2 ice core
作者: Geng L. ; Zatko M.C. ; Alexander B. ; Fudge T.J. ; Schauer A.J. ; Murray L.T. ; Mickley L.J.
刊名: Geophysical Research Letters
ISSN: 0094-9328
EISSN: 1944-9059
出版年: 2015
卷: 42, 期: 13 起始页码: 5346
结束页码: 5354
语种: 英语
英文关键词: ice core
; nitrate
; nitrogen isotopes
; postdepositional processing
Scopus关键词: Climate models
; Glacial geology
; Glaciers
; Isotopes
; Nitrates
; Nitrogen
; Snow
; Atmospheric conditions
; Climate transition
; Depositional fluxes
; Fractional loss
; Greenland Ice Sheet
; Ice core
; Model calculations
; Nitrogen isotopes
; Ice
; depositional sequence
; Holocene
; ice core
; nitrate
; nitrogen isotope
; paleoclimate
; snow
; ultraviolet radiation
; Arctic
; Greenland
; Greenland Ice Sheet
英文摘要: Records of ice core nitrate and its isotopes hold the potential to assess past atmospheric conditions regarding NOx and oxidant levels. However, relating such records to past atmospheric conditions requires a site-specific understanding of the postdepositional processing of snow nitrate. We report δ15N(NO3 -) records from the Greenland Ice Sheet Project 2 (GISP2) ice core over major climate transitions. Model calculations and comparison with records of parameters influencing UV-driven postdepositional processing of snow nitrate suggest that the observed variability in GISP2 δ15N(NO3 -) over major climate transitions is primarily driven by changes in the degree of postdepositional loss of snow nitrate. Estimates of the fractional loss of snow nitrate is (16-23)% in the Holocene and (45-53)% in the glacial period, suggesting a (41±32)% lower nitrate depositional flux to Greenland during the glacial period relative to the Holocene. Key Points UV-driven loss of snow nitrate determines its N isotopes in different climates Fractional loss of snow nitrate was up to 50% in the ice age at Summit Greenland Nitrate depositional flux to Greenland in the last ice age is ∼40% lower than in the Holocene. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84938214192&doi=10.1002%2f2015GL064218&partnerID=40&md5=2886465efc64549805df8227e8db2f34
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8943
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 Atmospheric Sciences, University of Washington, Seattle, WA, United States
Recommended Citation:
Geng L.,Zatko M.C.,Alexander B.,et al. Effects of postdepositional processing on nitrogen isotopes of nitrate in the Greenland Ice Sheet Project 2 ice core[J]. Geophysical Research Letters,2015-01-01,42(13).