全球陆地水储量的急剧下降及其与海平面变化的关系
Matthew Rodell1, Anne Barnoud2, Franklin R Robertson3
1NASA Goddard Space Flight Center, Greenbelt, MD 20771 USA.
Surveys in geophysics
|December 30, 2024
概括
由于干旱,全球陆地水储量在2014-2016年间急剧下降,并没有恢复. 这种下降与海平面上升有关,尽管海平面数据的分歧仍然无法解释.
科学领域:
- 地球科学 地球科学 地球科学
- 气候科学 气候科学
- 水文学的水文学
背景情况:
- 根据GRACE和GRACE-FO任务的观察,全球陆地储水 (TWS) 在2014年至2016年期间大幅下降.
- 这种下降一直持续,到2023年,TWS还没有恢复,仍然比以前的水平低1厘米.
- 一系列全球干旱,加剧了厄尔尼诺现象和潜在的气候变化,导致了这一TWS减少.
研究的目的:
- 调查全球陆地水储量急剧下降背后的机制.
- 探索2015年以来巴里静态海平面估计差异的潜在解释.
- 分析陆地储水变化与海平面上升之间的关系.
主要方法:
- 来自重力恢复和气候实验 (GRACE) 和GRACE后续 (GRACE-FO) 任务的数据分析.
- 对五大洲的干旱模式的检查.
- 将GRACE/FO衍生出的低静态海平面估计值与来自卫星高度测量和Argo浮动数据的估计值进行比较.
主要成果:
- 全球TWS从2014年5月到2016年3月出现了快速下降,到2023年还没有恢复.
- 南美洲和其他地区的干旱是TWS减少的主要原因.
- 从2015年开始,巴里静态海平面估计的差异被观察到,与TWS下降没有明确的因果关系.
结论:
- 全球TWS的急剧下降归因于严重的干旱,并可能被全球变暖放大.
- 自2015年以来观察到的低静态海平面上升被注意到,但其与其他估计的分歧被认为是巧合的.
- 需要进一步的研究来了解驱动TWS变化的机制以及海平面上升测量的差异.
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