大气变暖加上融水加剧了格陵兰冰川的海洋融化

自然·地球科学,2022年10月3日

虽然以前认为海洋温度是格陵兰冰原海洋边缘融化的主要原因,但新的研究表明,大气变暖通过融水流出海面的影响,对这种水下融化同样重要。气温升高加剧了冰原的融化,产生的暖流涓涓细流穿过冰层。一旦这些融水到达海洋,就会形成一股暖流向上升腾,将热量传递到冰川末端。温暖的峡湾水也会被这些快速流动的淡水水柱带起,进一步加速冰的流失。因此,大气变暖在控制冰川退缩和冰山生成方面起着至关重要的作用。至少在格陵兰岛西北部,这一过程似乎起着主导作用,格陵兰冰原的其他地区也可能同样容易受到这些由地表融化驱动的暖淡水涌的影响。这项研究强调了冰原健康与其周围大气环境的密切联系,并强调需要紧急减少排放,以减缓格陵兰岛对全球海平面上升的影响。.

https://www.nature.com/articles/s41561-022-01035-9

帕姆·皮尔森

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