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  1. 防災科研関係論文

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

https://nied-repo.bosai.go.jp/records/5923
https://nied-repo.bosai.go.jp/records/5923
e8153c5a-8588-47cc-8971-b1be83971295
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Light-absorbing snow impurity concentrations measured on Northwest Greenland ice sheet in 2011 and 2012
言語
言語 eng
著者 Teruo Aoki

× Teruo Aoki

en Teruo Aoki

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Sumito Matoba

× Sumito Matoba

en Sumito Matoba

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Satoru Yamaguchi

× Satoru Yamaguchi

en Satoru Yamaguchi

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Tomonori Tanikawa

× Tomonori Tanikawa

en Tomonori Tanikawa

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Masashi Niwano

× Masashi Niwano

en Masashi Niwano

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Katsuyuki Kuchiki

× Katsuyuki Kuchiki

en Katsuyuki Kuchiki

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Kouji Adachi

× Kouji Adachi

en Kouji Adachi

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Jun Uetake

× Jun Uetake

en Jun Uetake

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Hideaki Motoyama

× Hideaki Motoyama

en Hideaki Motoyama

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Masahiro Hori

× Masahiro Hori

en Masahiro Hori

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抄録
内容記述タイプ Other
内容記述 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 degrees N, 68 degrees 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 mu m, which suggests possible emission source areas are peripheral bare soil regions of Greenland and/or the Canadian Arctic.
言語 en
書誌情報 en : BULLETIN OF GLACIOLOGICAL RESEARCH

巻 32, 号 0, p. 21-31, 発行日 2014
出版者
言語 en
出版者 NIHON SEPPYO GAKKAI-JAPANESE SOC SNOW & ICE
ISSN
収録物識別子タイプ EISSN
収録物識別子 1884-8044
DOI
関連識別子 10.5331/bgr.32.21
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