まとめ
北大西洋は,予想に反して1988年に驚くほど少ない二酸化炭素 (CO2) の純流量を示した. この研究では,大洋は大気中のCO2よりも酸素 (O2) のシンクが大きいことが明らかになりました.
科学分野:
- 海洋学 海洋学 海洋学
- バイオジオケミストリー バイオジオケミストリー
- 気候科学 気候科学
背景:
- 北大西洋は,伝統的に大気中の二酸化炭素 (CO2) の重要なシンクと見なされています.
- 海洋ガス交換の理解は,気候モデリングと将来の大気中のCO2濃度の予測に不可欠です.
研究 の 目的:
- 二酸化炭素 (CO2) と酸素 (O2) のフロリダ海峡を横断し,大西洋に北緯約25度で流入する総量と純量の輸送を定量化する.
- 1988年の大気と北大西洋の間のCO2の純流量を評価する.
主な方法:
- 測定されたCO2の濃度,O2の濃度,および関連する化学物質の種類.
- 海洋質量輸送の推定値と化学測定を組み合わせた.
- CO2とO2の北と南の流れを計算した.
主要な成果:
- 1988年,25°Nの南に向かって,0.7 x 10^6モル/秒 (0.26 +/- 0.03ギガトン/年) のCO2の純流が観測された.
- O(2) の純輸送量は,北に向かって毎秒2.08×10(6) モルであり,CO(2) の純流量の3倍であった.
- CO2の吸収源としての北大西洋の役割は,かなりの熱損失にもかかわらず,予想よりも小さかった.
結論:
- 北大西洋は1988年に大気中のCO2を吸収する比較的小さなシンクとして機能した.
- この緯度では,海洋はCO2よりもO2の吸収量が大きい.
- 熱的および化学的なポンプ効果は,CO2とO2のサイクルに異なる影響を及ぼし,純ガス交換に影響を与えます.
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