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Freshwater Microbial Ecology01:24

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北部の硬水湖からのCO2流出が減少し,大気温暖化が増加する.

Kerri Finlay1, Richard J Vogt1, Matthew J Bogard1

  • 1Limnology Laboratory, Department of Biology, University of Regina, Regina, Saskatchewan, Canada S4S 0A2.

Nature
|March 4, 2015
PubMed
まとめ

大気温暖化は,氷の覆いを減らすことにより,硬水湖からの二酸化炭素 (CO2) 排出量を減少させる可能性があります. このシフトは,気温上昇が常に水生生態系のCO2排出量を増加させるわけではないことを示しています.

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科学分野:

  • 環境科学 環境科学
  • リムテクノロジーとは
  • バイオジオケミストリー バイオジオケミストリー

背景:

  • ボレアル湖は,地球規模の炭素循環に影響を与える重要な生地化学的ホットスポットである.
  • 薄れた北極湖は,かなりの量の二酸化炭素 (CO2) とメタンを放出し,気候変動による増加の可能性があります.
  • 炭酸塩が豊富な硬水と塩水湖における炭素流動のダイナミクスは,理解が薄いままです.

研究 の 目的:

  • 硬水湖における炭素の流れに対する大気温暖化の影響を調査する.
  • 気候の変動に対応した湖のpHとCO2交換の10年間の傾向を分析する.
  • 水中の炭素循環の変化を促すメカニズムを理解する.

主な方法:

  • 十年にわたる気象データ,二酸化炭素の流れ,水化学の記録の分析.
  • 様々な湖のタイプの間でpHと炭素の交換の変動を調査する.
  • 統計分析を用いて,気候変数を湖の生地化学プロセスと関連付ける.

主要な成果:

  • 硬水湖は1990年代半ばから2010年までの間にCO2源からCO2吸収源へと移行した.
  • これらの湖の年間平均pH値の一貫した上昇が観察されました.
  • 大気温暖化による春の氷層の減少は,二酸化炭素の蓄積の減少と二酸化炭素の吸収の増加と関連していた.

結論:

  • 大気温暖化は,一般の予想に反して,硬水湖からのCO2排出量を減らすことができます.
  • 氷の覆いの持続時間の変化は,湖のpHと炭素の吸収に大きく影響を与えます.
  • 水生生態系は,気候変動に対する複雑な反応を示し,炭素の放出を均一に増加させない可能性があります.