Threat by marine heatwaves to adaptive large marine ecosystems in an eddy-resolving model.

Threat by marine heatwaves to adaptive large marine ecosystems in an eddy-resolving model.
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DOI:
10.1038/s41558-021-01266-5
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发表时间:
2022-03
影响因子:
30.7
通讯作者:
Gao H
Gao H
中科院分区:
地球科学1区
文献类型:
--
作者:
Guo X;Gao Y;Zhang S;Wu L;Chang P;Cai W;Zscheischler J;Leung LR;Small J;Danabasoglu G;Thompson L;Gao H

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海洋热浪(MHWs)是异常高海表温度(SST)的偶发期,严重影响海洋生态系统。大型海洋生态系统(LMEs)覆盖了全球海洋的22%,但占全球渔业捕捞量的95%。然而,气候变化如何影响LMEs上空的高强度风暴仍然未知,因为这样的LMEs仅限于海岸,那里的低分辨率气候模式已知存在偏差。本文利用高分辨率地球系统模式,并应用一个“未来阈值”,将强热带气旋视为高于海温长期平均增温的异常增温,我们发现,在大多数LMEs上,强热带气旋的未来强度和年日数仍高于当前气候。与低分辨率模式相比,更高分辨率的海洋中尺度涡旋可以模拟更真实的大涡。在全球变暖的情况下,即使居住生物能够完全适应长期平均变暖,这些高分子量生物的增加也会对低分子量生物构成严重威胁。
Marine heatwaves (MHWs), episodic periods of abnormally high sea surface temperature (SST), severely affect marine ecosystems. Large Marine Ecosystems (LMEs) cover ~22% of the global ocean but account for 95% of global fisheries catches. Yet how climate change affects MHWs over LMEs remains unknown, because such LMEs are confined to the coast where low-resolution climate models are known to have biases. Here, using a high-resolution Earth system model and applying a “future threshold” that considers MHWs as anomalous warming above the long-term mean warming of SSTs, we find that future intensity and annual days of MHWs over majority of the LMEs remain higher than in the present-day climate. Better resolution of ocean mesoscale eddies enables simulation of more realistic MHWs than low-resolution models. These increases in MHWs under global warming poses a serious threat to LMEs, even if resident organisms could adapt fully to the long-term mean warming.
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