DOI: 10.1002/grl.50589
论文题名: Modeling the influence of photochemistry on hydrogen peroxide concentrations in an Arctic snowpack
作者: Hullar T. ; Anastasio C.
刊名: Geophysical Research Letters
ISSN: 0094-8931
EISSN: 1944-8662
出版年: 2013
卷: 40, 期: 11 起始页码: 2694
结束页码: 2698
语种: 英语
英文关键词: Greenland
; HOOH
; ice
; snow
Scopus关键词: Field measurement
; Greenland
; HOOH
; Hydrogen peroxide concentration
; Laboratory experiments
; Photoproductions
; Physical process
; Temperature dependent
; Chemical reactions
; Chromophores
; Hydrogen peroxide
; Ice
; Peroxides
; Photolysis
; Snow
; atmospheric chemistry
; climate modeling
; hydrogen peroxide
; laboratory method
; photochemistry
; snowpack
; Arctic
; Greenland
; Summit
英文摘要: While laboratory experiments suggest that hydrogen peroxide (HOOH) on polar snow grains should be completely photolyzed during summer, field measurements show a continuous, multiyear record of HOOH in the snowpack. To understand this discrepancy, we apply a snow parcel model to follow HOOH in the snowpack at Summit, Greenland. Taking into account snowfall and variations in actinic flux, we evaluate the impact of three photochemical factors on HOOH preservation: the quantum efficiency of HOOH photodestruction, HOOH recycling through organic compounds, and HOOH photoproduction from snowpack chromophores. We find that 60%-100% of deposited HOOH is preserved in the first year, with less preservation of HOOH deposited during summer, and that the OH produced from HOOH photolysis likely contributes strongly to transforming snowpack bromide and organic compounds. Our findings suggest that photochemistry plays an important role in HOOH loss in snows at Summit and other polar sites, complementing temperature-dependent physical processes. © 2013 American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84879959601&doi=10.1002%2fgrl.50589&partnerID=40&md5=a42ddf8cb8e81c77d26e9d6cbc3e346b
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6195
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Department of Land, Air and Water Resources, University of California, One Shields Ave., Davis, CA 95616, United States
Recommended Citation:
Hullar T.,Anastasio C.. Modeling the influence of photochemistry on hydrogen peroxide concentrations in an Arctic snowpack[J]. Geophysical Research Letters,2013-01-01,40(11).