Age of Canada basin deep waters:北極海の原産物を推定する方法
まとめ
研究者らは,カナダ盆地の炭素流量と水の年齢を用いて北極海の原産量を推定した. これは,北極圏を理解するためのベースラインを提供します.
科学分野:
- 海洋学 海洋学とは
- バイオジオケミストリー バイオジオケミストリー
- アークティック・リサーチ・アークティック研究
背景:
- 北極海のカナダ流域は,ロモノソフ山脈によって独特に隔離されており,世界の海洋とは異なる深水環境を生み出しています.
- 深い盆地における水の年齢は,長い時間スケールにおける栄養素の循環と有機物質の流れの代理として機能することができます.
- 北極の炭素循環を理解することは,世界の気候規制における重要な役割のため,極めて重要です.
研究 の 目的:
- 北極海のカナダ盆地における一次生産の長期的な割合を推定する.
- 深い北極盆地への有機物質の平均フローをモデル化するために.
- 世界的な炭素循環への北極海の貢献の基準を確立する.
主な方法:
- 水質の炭素流量と放射性炭素 ((14) C) 年代測定を統合した経験的モデルを利用した.
- 加拿大流域の水サンプルを深さの関数として分析した.
- 有機物質の流れを推論するために,栄養分レベルと酸素利用と相関する深海の年齢.
主要な成果:
- カナダ盆地の深水の年齢が約1000年であることを決定しました.
- 1500メートルのイソバースに年間1平方メートルあたり0.3グラムの炭素の炭素流量を計算しました.
- この地域の総原発生産量は,年間1平方メートルあたり9〜14グラムの炭素であると推定されています.
結論:
- この研究は,北極海のデータ不足地域における一次生産の定量的な見積もりを提供します.
- この発見は,長期の生地化学的プロセスを理解する上で,孤立した深水システムの重要性を強調しています.
- この研究は,地球規模の炭素循環における北極の役割と,気候変動に対するその感受性を評価するために不可欠なデータを提供している.
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