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大西洋の深部に急速な酸性化をもたらします
Fiz F Perez1, Marcos Fontela1, Maribel I García-Ibáñez1
1Instituto Investigaciones Marinas (IIM, CSIC), calle Eduardo Cabello, 6, 36208, Vigo, Spain.
Nature
|February 13, 2018
まとめ
工業用二酸化炭素 (CO2) の影響による海洋酸性化は,北大西洋のアラゴニット飽和の地平線を急速に縮小させている. これは数十年以内に 腐食する水で 深海のサンゴの生息地を脅かします
科学分野:
- 海洋学
- 海洋化学
- 気候科学
背景:
- 北大西洋は人為的な二酸化炭素 (CO2) を蓄積し,海洋酸性化につながります.
- 海洋酸性化により 炭酸イオンの濃度が低下し アラゴニット飽和地平線が浅くなり サンゴは腐食性の水に晒されます
研究 の 目的:
- アラゴナイトの飽和率を分析する
- 炭酸イオン輸送の変化が深海の生態系に与える影響を決定する.
主な方法:
- 北大西洋の海洋学データのデータベース分析
- アラゴニット飽和度の地平線深さの変化の計算
- カーボネートイオン輸送の決定は,大西洋の meridional 転覆循環によって行われます.
主要な成果:
- 亜極北大西洋の アラゴニット飽和地平線は 30年以内に 1,000-1,700メートルまで 沈む可能性があります
- イルミンゲル海では 1991年から2016年まで 年間10〜15メートルの地平線が下がりました
- 深海への炭酸イオン輸送は 工業化以前のレベルより 44%低い
結論:
- 海洋の酸性化が加速し 冷水サンゴの生息地を脅かしています
- 二酸化炭素の増加による炭酸イオン輸送の減少は,これらの生態系を危険にさらす可能性があります.
- 酸化水は 海洋循環によって南へ流され 地球の海洋に 影響を及ぼします
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