作为对工业后北极变暖的反应,格陵兰的排水量非线性上升
Luke D Trusel1,2, Sarah B Das3, Matthew B Osman4
1Department of Geology, Rowan University, Glassboro, NJ, USA. trusel@rowan.edu.
Nature
|December 7, 2018
概括
最近的格陵兰冰盖融化在过去350年中是非常罕见的. 这项研究重建了过去的融化速度,显示最近的融化超过了由于工业时代变暖的自然变化.
科学领域:
- * 气候科学
- * 冰川学
- * 古气候学
背景情况:
- * 格陵兰冰盖 (GrIS) 在全球海平面上升方面发挥着重要作用.
- 表面的融化水流动是最近冰块流失的主要原因.
- * 在卫星时代之前,过去的融化变化,强度和流量是不确定的.
研究的目的:
- * 建立第一个连续的,多个世纪的,受观察限制的Gris表面融化强度和流水记录.
- * 至少在过去的350年中评估近期Gris融化的异常性.
- * 为了重建过去的冰盖尺度表面融化和流动.
主要方法:
- * 格陵兰西部中部冰芯的平面分析.
- *使用透区冰芯中重新化的融层量化过去的融化速度.
- * 冰芯融化记录与模拟的融化速率和卫星推导的融化持续时间相关联.
主要成果:
- 在过去的350年中,最近的Gris融化是非常罕见的.
- * 冰芯融化记录与模拟和卫星衍生的融化数据有显著的相关性.
- 在1800年代中期,随着北极的变暖,灰色地带的融化开始增加,但其规模最近超过了自然变化.
结论:
- * 冰核中的再融层提供了一种可靠的方法来重建过去的融化速度.
- 在过去的350年里, 格里斯的融化规模是前所未有的.
- 由于非线性融化反应,持续的变暖将加快灰色流水和海平面的贡献.
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