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一个由气候驱动的水文减缓了十年的海平面上升
J T Reager1, A S Gardner2, J S Famiglietti3
1Jet Propulsion Laboratory, California Institute of Technology, CA, USA. john.reager@jpl.nasa.gov.
概括
2002年至2014年间,气候变化导致陆地水储量发生重大变化,导致海平面上升速度放缓. 这种陆地水储量增长部分抵消了冰川融化和地下水枯竭.
科学领域:
- 地球科学
- 气候科学
- 水文学
背景情况:
- 由于观察难度, 海平面预算往往忽略了气候驱动的陆地水储量变化.
- 准确的海平面上升归因需要量化所有促成因素,包括陆地水的动态.
研究的目的:
- 量化气候驱动的陆地储水变化对海平面预算的贡献.
- 评估这些变化对全球海平面上升速度的影响.
主要方法:
- 使用近期卫星测量时间变化的重力.
- 全球冰川损失的综合估计.
- 分类大陆陆面积变化以隔离水储效应.
主要成果:
- 在2002年至2014年期间,由于气候变化,陆地水储量增加了3200±900千兆.
- 这种陆地水储量的增加使海平面上升速度每年减缓0.71±0.20毫米.
- 陆地水的增加抵消了冰盖,冰川和地下水的损失.
结论:
- 陆地水储量的气候变化是十年海平面变化的一个重要因素.
- 纳入陆地水储动态对于准确的海平面上升归因至关重要.
- 未来的海平面预测必须考虑到水文周期的变化.
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