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Hokkaido University Collection of Scholarly and Academic Papers >
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Light-absorbing snow impurity concentrations measured on Northwest Greenland ice sheet in 2011 and 2012
| 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 | | dust | | sublimation | | グリーンランド | | 積雪不純物 | | ブラックカーボン | | ダスト | | 昇華 |
| 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 |
| URI: | http://hdl.handle.net/2115/56971 |
| 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)
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Submitter: 的場 澄人
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