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Seasonal variations in the major chemical species of snow at the South East Dome in Greenland
https://nipr.repo.nii.ac.jp/records/11044
https://nipr.repo.nii.ac.jp/records/11044901bd47c-2d8e-457f-b782-424ab95f2ead
Item type | 学術雑誌論文 / Journal Article(1) | |||||
---|---|---|---|---|---|---|
公開日 | 2016-03-16 | |||||
タイトル | ||||||
タイトル | Seasonal variations in the major chemical species of snow at the South East Dome in Greenland | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Seasonal variations in the major chemical species of snow at the South East Dome in Greenland | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Snow chemistry | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Greenland | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Seasonality | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Ion species | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Glaciology | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
アクセス権 | ||||||
アクセス権 | metadata only access | |||||
アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
著者 |
Ikumi Oyabu
× Ikumi Oyabu× Sumito Matoba× Tetsuhide Yamasaki× Moe Kadota× Yoshinori Iizuka |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | We analyze snow-pit samples collected in May 2015 at the South East Dome (SE Dome) on the Greenland ice sheet. The analysis includes high-resolution records of δD and δ18O, as well as the major ions, CH3SO3−, Cl−, NO3−, SO42−, Na+, NH4+, K+, Ma2+, and Ca2+. We find that the 3.55-m snow pit recorded temperature and aerosol proxies back to summer or autumn of 2014. This indicates a higher accumulation rate than those at other major drilling sites in Greenland. Due to this high accumulation rate, ion concentrations except Na+ are lower than those typical of the central Greenland ice sheet. Concerning seasonal variability, the Na+, Cl−, Ca2+, Mg2+, and NO3− vary similarly to other sites in Greenland, with the Na+ and Cl− peaking in winter to early spring, Ca2+ peaking in spring, Mg2+ peaking in winter to spring, and NO3− towards a peak in summer while showing smaller peaks in winter to spring. The NH4+ increased in spring, and SO42− increased in autumn to winter at SE Dome. On the other hand, the seasonal trend in the Cl−/Na+ ratio differs from those in the inland region. As we did not fully recover one seasonal cycle, some seasonal peaks may have been missed. | |||||
内容記述 | ||||||
内容記述タイプ | Other | |||||
内容記述 | 2015年5月にグリーンランド氷床南東ドームにおいて、3.55 mの積雪ピットを掘り、積雪断面観測および積雪試料の採取を行った。採取した雪試料を用い、水安定同位体比(δD、δ18O)と主要イオン濃度(CH3SO3−、Cl−、NO3−、SO42−、Na+、NH4+、K+、Ma2+、Ca2+)を分析した。断面観測と化学分析の結果から、3.55 mの積雪は2014年の夏〜秋以降に涵養したものであることがわかった。この涵養量はグリーンランド内陸の主な氷床コア掘削地点よりも高い。高い涵養量によって希釈されたため、Na+を除くイオン濃度はグリーンランド内陸よりも低かった。Na+、Cl−、Ca2+、Mg2+、NO3−の季節変動は、グリーンランド内陸と似ており、Na+とCl−は冬〜初春、Ca2+は春、Mg2+は冬〜春にピークをもつことがわかった。NO3−は夏に向かって濃度が高くなり、冬〜春にも小さなピークがあった。NH4+は春に増加し、SO42−は秋〜冬にかけて増加した。一方、Cl−/Na+の季節変動は他のグリーンランド内陸と異なることがわかった。ただし、我々が観察した積雪ピットは1年分の季節変動を追える深度に達していなかった可能性が高く、見逃したシグナルがあるかもしれない。 | |||||
書誌情報 |
Polar Science en : Polar Science 巻 10, 号 1, p. 36-42, 発行日 2016-03 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 1873-9652 | |||||
DOI | ||||||
識別子タイプ | DOI | |||||
関連識別子 | http://doi.org/10.1016/j.polar.2016.01.003 | |||||
関連名称 | 10.1016/j.polar.2016.01.003 |