グリーンランドの融解は,氷床からのメタンの継続的な輸出を促しています
Guillaume Lamarche-Gagnon1, Jemma L Wadham2, Barbara Sherwood Lollar3
1School of Geographical Sciences, University of Bristol, Bristol, UK. guillaume.lg@bristol.ac.uk.
Nature
|January 4, 2019
まとめ
氷床からメタンが大量に放出されます 効率的な排水システムは このメタンを排出し 世界的な予算と大気中のメタンレベルに影響を与えます
科学分野:
- 地球科学
- 氷河学
- 生地化学
背景:
- 地球規模のメタン予算は 氷床を無視しています
- 以前の研究では 氷床からメタンが放出される可能性が示唆されていました
- 氷床の現在のメタンフットプリントに関する 経験的データはありませんでした
研究 の 目的:
- グリーンランドの氷床の下からメタンの生産と輸出を調査する
- 氷床から大気圏へのメタンの流れを 定量化するために
- 氷河下のメタンの起源と運命を決定する
主な方法:
- 氷河下の水域と氷の縁の水域におけるメタン濃度の継続的なモニタリング
- メタンの起源を決定する安定同位体分析
- メタンの輸送と逃逸を理解するための水学モデルです.
主要な成果:
- 氷床下でのメタンの生産は確認され,グリーンランドの氷床からメタン過飽和の水が継続的に輸出されています.
- 氷床から6.3トンのメタンが 溶けた季節に横に運ばれたと推定されています
- メタンの流出は世界の主要河川の流出に匹敵し 酸化も限られています
- 埋もれた有機と無機の炭素を利用する微生物の活動がメタンの原因である可能性が高い.
結論:
- 氷床には 生物学的活性のある 広範囲のメタノゲン環境があります
- 効率的な氷河下の排水システムは 大気へのメタンの輸出を容易にする.
- 氷床は地球のメタン予算の過小評価されている構成要素であり,将来の評価に含まれるべきです.
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