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划分最近的格陵兰岛质量损失
Michiel van den Broeke1, Jonathan Bamber, Janneke Ettema
1Institute for Marine and Atmospheric Research, Utrecht University, Netherlands. m.r.vandenbroeke@uu.nl
概括
格陵兰冰盖的质量损失同样是由表面过程和冰的动态驱动的. 卫星数据显示,自2006年以来,融化加速,对全球海平面上升做出了重大贡献.
科学领域:
- 冰川学的冰川学
- 气候科学 气候科学
- 地球系统科学 地球系统科学
背景情况:
- 格陵兰岛冰盖质量损失是导致全球海平面上升的重要因素.
- 了解冰层消失的驱动因素对于气候建模和海平面预测至关重要.
研究的目的:
- 量化最近格陵兰岛冰块质量损失的各个组成部分.
- 评估表面过程和冰动态对质量平衡的影响.
- 用卫星重力观测来验证质量预算计算.
主要方法:
- 进行了大规模预算计算,以量化格陵兰岛的冰损失.
- 来自重力恢复和气候实验 (GRACE) 的卫星重力观测被用于验证.
- 分析重点关注2000-2008年期间和2006年以来的趋势.
主要成果:
- 从2000年至2008年,格陵兰的总质量损失约为1500千兆,导致海平面上升0.46毫米/年.
- 质量损失均分地分布在表面过程 (流水和降水) 和冰的动态之间.
- 自2006年以来,夏季融化速度的增加导致了每年273千兆的加速质量损失 (每年0.75毫米的海平面上升).
- 没有增加的降雪和重新结,1996年后的质量损失将是100%更高.
结论:
- 表面质量平衡的变化完全解释了GRACE质量变化,这表明冰的次年排放变化最小.
- 表面过程和冰的动态都在格陵兰对海平面上升的贡献中发挥着关键作用.
- 由于气候变化而加速的融化是最近格陵兰冰川消失的主要驱动因素.
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