Hydrological cycle amplification reshapes warming-driven oxygen loss in the Atlantic Ocean
Hydrological cycle amplification reshapes warming-driven oxygen loss in the Atlantic Ocean
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DOI：
10.1038/s41558-023-01897-w
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发表时间：
2024-01-08
影响因子：
30.7
通讯作者：
Vecchi，Gabriel
中科院分区：
文献类型：
--
作者：
Hogikyan，Allison;Resplandy，Laure;Vecchi，Gabriel
由于变暖而导致的海洋氧气流失并不是普遍存在的。在1公里深度以上的大西洋中，亚极地纬度存在氧气损失，但在过去六十年中，亚热带地区没有氧气损失或增加。在这里，我们表明，放大的水文循环，对气候变化的响应，结果在一个“咸得到咸，新鲜得到新鲜”的海面盐度模式，影响海洋通风，并介绍了一个空间模式的气候变化驱动的氧气损失率在地球系统模型。盐碱化增强了在亚热带露出水面的（已经含盐的）模式沃茨的通风，并对抗变暖驱动的氧气损失，而淡水化减少了在亚极地纬度露出水面的（已经新鲜的）深层沃茨的通风，并加速氧气损失。这些结果表明，气候变化通过地表盐度变化引入了氧化模式，这是理解观测到的和未来区域变化的关键。
The loss of oxygen from the ocean due to warming is not ubiquitous. In the Atlantic Ocean above 1 km depth, there is oxygen loss at subpolar latitudes, but there has been no oxygen loss or gain in the subtropics over the past six decades. Here we show that the amplification of the hydrological cycle, a response to climate change that results in a ‘salty-get-saltier, fresh-get-fresher’ sea surface salinity pattern, influences ocean ventilation and introduces a spatial pattern in the rate of climate change-driven oxygen loss in an Earth system model. A salinification enhances ventilation of (already salty) mode waters that outcrop in the subtropics and opposes warming-driven oxygen loss, while a freshening reduces ventilation of (already fresh) deep waters that outcrop at subpolar latitudes and accelerates oxygen loss. These results suggest that climate change introduces patterns of oxygenation through surface salinity changes, key to understanding observed and future regional changes.