Transient Influence of the Reduction of Deepwater Formation on Ocean Heat Uptake and Heat Budgets in the Global Climate System
Transient Influence of the Reduction of Deepwater Formation on Ocean Heat Uptake and Heat Budgets in the Global Climate System
复制标题
深水地层减少对全球气候系统海洋吸热和热量收支的瞬时影响
DOI：
10.1029/2021gl095179
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发表时间：
2022
影响因子：
5.2
通讯作者：
Tatebe Hiroaki
中科院分区：
文献类型：
--
作者：
Suzuki Tatsuo;Komuro Yoshiki;Kusahara Kazuya;Tatebe Hiroaki
极地密集深水区的形成和扩展在最重要的气候系统之一，即海洋纬向翻转环流中起着关键作用，在全球变暖的情况下，深水区的形成预计会减少。然而，尚未详细探讨深水地层减少对气候系统的影响。在这里，我们进行了一系列的数值实验与气候模式，其中向下的水质量传输通过底部边界层被人为减少，以定量评估其对瞬态海洋和气候响应的影响。研究表明，深水地层的变化不仅对海洋热含量有不可忽视的影响，而且对大气层顶部的地球辐射收支也有不可忽视的影响：高纬度海洋中深水地层的减少导致底层水变暖，海洋表面冷却，以及随后传出长波辐射的减少。
The formation and spreading of dense deepwater in the polar regions play a key role in one of the most important climate systems, namely ocean meridional overturning circulation, and the deepwater formation is projected to decrease under the global warming. However, the impact of the reduced deepwater formation on the climate system has not been explored in detail. Here, we performed a series of numerical experiments with a climate model where the downward water mass transport through the bottom boundary layer is artificially reduced to quantitatively evaluate its impacts on the transient ocean and climate responses. It is demonstrated that changes in deepwater formation have non‐negligible impacts on not only ocean heat content but also the Earth's radiation budget at the top of the atmosphere: reduction in deepwater formation in high‐latitude oceans causes warming of bottom water, cooling of the ocean surface, and a subsequent decrease in outgoing longwave radiation.