Global impacts of recent Southern Ocean cooling.
Global impacts of recent Southern Ocean cooling.
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DOI：
10.1073/pnas.2300881120
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发表时间：
2023-07-25
影响因子：
11.1
通讯作者：
Ceppi, Paulo
中科院分区：
文献类型：
--
作者：
Kang, Sarah M.;Yu, Yue;Deser, Clara;Zhang, Xiyue;Kang, In- Sik;Lee, Sun- Seon;Rodgers, Keith B.;Ceppi, Paulo
最近，南大洋表面明显冷却;与此同时，热带太平洋也在冷却，特别是在东部海盆。然而，这些海表温度（SST）的趋势是出了名的没有捕捉到的耦合全球气候模式下的历史强迫。这是一个悬而未决的问题，如果失踪的南大洋冷却信号部分解释了模式观测的差异，在最近的热带太平洋海温趋势。一个耦合模式的相互比较研究揭示了全球遥相关模式驱动的观测南大洋海温下降的模式与现实的强云反馈。因此，我们的研究结果表明，南大洋海温下降是部分负责驱动东南热带太平洋冷却在最近几十年。自卫星时代开始以来，尽管全球变暖，南大洋的海面温度（SST）已经冷却。虽然观测到的南大洋冷却以前被报道对热带太平洋的影响最小，这种遥相关的效率最近被证明是介导的副热带云反馈，是高度依赖于模型。在这里，我们进行了一个耦合模型相互比较的配对合奏模拟下的历史辐射强迫：一个自由发展的SST和其他南大洋SST异常约束以下的观测。我们揭示了全球的影响，所观察到的南大洋冷却模型与更强（和更现实）的云反馈，包括南极海冰扩张，东南热带太平洋冷却，北移哈德利环流，阿留申低减弱，北太平洋变暖。因此，我们的研究结果表明，观测到的南大洋SST下降可能有助于近几十年来热带太平洋东部的冷却条件。
In the recent past, the Southern Ocean has undergone a pronounced surface cooling; at the same time, the tropical Pacific has been cooling particularly in the eastern basin. However, these sea surface temperature (SST) trends are notoriously not captured by coupled global climate models under historical forcing. It is an open question if the missing Southern Ocean cooling signal partly explains the model-observation discrepancy in the recent tropical Pacific SST trends. A coupled model intercomparison study conducted here reveals a global teleconnection pattern driven by observed Southern Ocean SST decrease in the model with realistically strong cloud feedbacks. Our results thus suggest that Southern Ocean SST decrease is partly responsible for driving the southeastern tropical Pacific cooling in recent decades. Since the beginning of the satellite era, Southern Ocean sea surface temperatures (SSTs) have cooled, despite global warming. While observed Southern Ocean cooling has previously been reported to have minimal impact on the tropical Pacific, the efficiency of this teleconnection has recently shown to be mediated by subtropical cloud feedbacks that are highly model-dependent. Here, we conduct a coupled model intercomparison of paired ensemble simulations under historical radiative forcing: one with freely evolving SSTs and the other with Southern Ocean SST anomalies constrained to follow observations. We reveal a global impact of observed Southern Ocean cooling in the model with stronger (and more realistic) cloud feedbacks, including Antarctic sea–ice expansion, southeastern tropical Pacific cooling, northward-shifted Hadley circulation, Aleutian low weakening, and North Pacific warming. Our results therefore suggest that observed Southern Ocean SST decrease might have contributed to cooler conditions in the eastern tropical Pacific in recent decades.
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影响因子：
4.9
作者：
Cabre, Anna;Marinov, Irina;Gnanadesikan, Anand
通讯作者：
Gnanadesikan, Anand
影响因子：
4.9
作者：
Dong, Yue;Proistosescu, Cristian;Battisti, David S.
通讯作者：
Battisti, David S.
影响因子：
18.3
作者：
England, Mark R.;Polvani, Lorenzo M.;Deser, Clara
通讯作者：
Deser, Clara
DOI：
10.1073/pnas.2207889119
发表时间：
2022-08-30
影响因子：
11.1
作者：
通讯作者：
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影响因子：
4.9
作者：
Ferreira, David;Marshall, John;Plumb, Alan
通讯作者：
Plumb, Alan