海洋热量导致了 Totten 冰架的快速基底融化。
Ocean heat drives rapid basal melt of the Totten Ice Shelf.
机构信息
Antarctic Climate and Ecosystems Cooperative Research Centre, University of Tasmania, Hobart, Tasmania, Australia.; Commonwealth Scientific and Industrial Research Organization Oceans and Atmosphere, Hobart, Tasmania, Australia.
Commonwealth Scientific and Industrial Research Organization Oceans and Atmosphere, Hobart, Tasmania, Australia.; Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, Tasmania, Australia.
出版信息
Sci Adv. 2016 Dec 16;2(12):e1601610. doi: 10.1126/sciadv.1601610. eCollection 2016 Dec.
Mass loss from the West Antarctic ice shelves and glaciers has been linked to basal melt by ocean heat flux. The Totten Ice Shelf in East Antarctica, which buttresses a marine-based ice sheet with a volume equivalent to at least 3.5 m of global sea-level rise, also experiences rapid basal melt, but the role of ocean forcing was not known because of a lack of observations near the ice shelf. Observations from the Totten calving front confirm that (0.22 ± 0.07) × 10 m s of warm water enters the cavity through a newly discovered deep channel. The ocean heat transport into the cavity is sufficient to support the large basal melt rates inferred from glaciological observations. Change in ocean heat flux is a plausible physical mechanism to explain past and projected changes in this sector of the East Antarctic Ice Sheet and its contribution to sea level.
西南极冰架和冰川的质量损失与海洋热通量引起的基底融化有关。东南极的托滕冰架支撑着一个海洋基冰盖，其体积相当于至少 3.5 米的全球海平面上升，也经历了快速的基底融化，但由于缺乏冰架附近的观测，海洋强迫的作用尚不清楚。从托滕冰架崩解前缘的观测结果证实，（0.22 ± 0.07）× 10 m s 的温水通过一个新发现的深通道进入冰架下的空洞。进入空洞的海洋热输送足以支持从冰川学观测推断出的较大基底融化速率。海洋热通量的变化是解释东南极冰架这一部分过去和预计变化及其对海平面贡献的一个合理的物理机制。
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