Fast retreat of Zachariae Isstrom, northeast Greenland
Fast retreat of Zachariae Isstrom, northeast Greenland
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DOI：
10.1126/science.aac7111
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发表时间：
2015-12-11
期刊：
影响因子：
56.9
通讯作者：
Paden, J.
中科院分区：
文献类型：
--
作者：
Mouginot, J.;Rignot, E.;Paden, J.
经过8年的冰架腐烂，格陵兰东北部的主要冰川扎卡里亚伊斯斯特罗姆(Zachariae Isstrom)于2012年秋季进入加速退缩阶段。该冰川相当于海平面上升0.5米。冰层速度的加速速度增加了两倍，剩余冰架融化和接地部分变薄的速度翻了一番，接地线上正在发生崩解。温暖的空气和海洋温度导致冰川脱离稳定的基床，沿着向下倾斜的海床迅速后退。其同等冰量的邻居NioghalvfJerdsfjorden也在迅速融化，但沿着向上倾斜的海床缓慢后退。这一以海洋为基础的部门的不稳定将在未来几十年内增加格陵兰冰盖的海平面上升。
After 8 years of decay of its ice shelf, Zachariae Isstrom, a major glacier of northeast Greenland that holds a 0.5-meter sea-level rise equivalent, entered a phase of accelerated retreat in fall 2012. The acceleration rate of its ice velocity tripled, melting of its residual ice shelf and thinning of its grounded portion doubled, and calving is now occurring at its grounding line. Warmer air and ocean temperatures have caused the glacier to detach from a stabilizing sill and retreat rapidly along a downward-sloping, marine-based bed. Its equal-ice-volume neighbor, Nioghalvfjerdsfjorden, is also melting rapidly but retreating slowly along an upward-sloping bed. The destabilization of this marine-based sector will increase sea-level rise from the Greenland Ice Sheet for decades to come.