气温升高加剧了南极西部洋流,并威胁着冰架

冰冻圈,9月1日

全球气温不断升高,加速了南极洲西部冰架底部的融化,将大量淡水输送到周围的海洋中(尽管不会使海平面升高,因为冰架已经位于水面上)。淡水的涌入形成了具有浮力的上层水,压缩了较深的较暖较咸的水层。这些下层水的深度不断增加,加强了南极沿岸流(AACC)的流动,使其能够以更快的速度输送更多的水。这些南极融水被困在海底的两个水槽中,并将较暖的海水向上压向南极洲西部的冰架。 数千年来,这些冰架稳定了南极西部冰原(WAIS)。 由于气候迅速变暖,这些周围水域的盐度、温度和分层发生了变化,使得冰架越来越容易失稳,从而导致南极西部冰原出人意料地迅速解体。 最近发布的 IPCC WGI AR6 报告指出,这种潜在的解体,加上其他来源,意味着不排除到 2150 年海平面上升 5 米的可能性。.

https://tc.copernicus.org/articles/15/4179/2021/

帕姆·皮尔森

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