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Light-absorbing snow impurity concentrations measured on Northwest Greenland ice sheet in 2011 and 2012

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Title: Light-absorbing snow impurity concentrations measured on Northwest Greenland ice sheet in 2011 and 2012
Other Titles: 2011年及び2012年に北西グリーンランド氷床上で観測された光吸収性積雪不純物濃度
Authors: AOKI, Teruo1 Browse this author →KAKEN DB
MATOBA, Sumito2 Browse this author →KAKEN DB
YAMAGUCHI, Satoru3 Browse this author →KAKEN DB
TANIKAWA, Tomonori4 Browse this author
NIWANO, Masashi5 Browse this author →KAKEN DB
KUCHIKI, Katsuyuki6 Browse this author →KAKEN DB
ADACHI, Kouji7 Browse this author
UETAKE, Jun8 Browse this author →KAKEN DB
MOTOYAMA, Hideaki9 Browse this author →KAKEN DB
HORI, Masahiro10 Browse this author
Authors(alt): 青木, 輝夫1
的場, 澄人2
山口, 悟3
谷川, 朋範4
庭野, 匡思5
朽木, 勝幸6
足立, 光司7
植竹, 淳8
本山, 秀明9
堀, 雅裕10
Keywords: Greenland
snow impurities
black carbon
Issue Date: Aug-2014
Publisher: The Japanese Society of Snow and Ice
Journal Title: Bulletin of Glaciological Research
Volume: 32
Start Page: 21
End Page: 31
Publisher DOI: 10.5331/bgr.32.21
Abstract: Light-absorbing snow impurities of elemental carbon (EC), organic carbon (OC), and mineral dust have been measured at three locations at elevations from 1,469 to 1,992 m on August 1, 2011, and at the site SIGMA-A (78°N, 68°W, elevation 1,490 m) on the northwest Greenland ice sheet (GrIS) during the period from June 28 to July 12, 2012. At SIGMA-A, a remarkable snow surface lowering together with snow melting was observed during the observation period in 2012, when a record surface melting event occurred over the GrIS. The concentrations in the surface were 0.9, 3.8, and 107 ppbw for EC, OC, and dust, respectively, at the beginning of the period, which increased to 4.9, 17.2, and 1327 ppbw for EC, OC, and dust, respectively, at the end. The EC and dust concentrations were remarkably higher than those at the three locations in 2011 and the recent measurements at Summit. However, our measurements for EC and OC could be underestimated because a recent study indicates that the collection efficiency of a quartz fiber filter, which we employed, is low. We confirm that the snow surface impurity concentrations were enhanced in the observation period, which can be explained by the effects of sublimation/evaporation and snow melt amplification associated with drastic melting. Scanning electron microscopy analysis of surface snow impurities on July 12 revealed that the major component of snow impurities is mineral dust with size larger than 5 μm, which suggests possible emission source areas are peripheral bare soil regions of Greenland and/or the Canadian Arctic.
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 的場 澄人

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