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DOI | 10.1175/JCLI-D-17-0900.1 |
Influence of the Atlantic Meridional Overturning Circulation on the Northern Hemisphere Surface Temperature Response to Radiative Forcing | |
Maroon, Elizabeth A.1; Kay, Jennifer E.; Karnauskas, Kristopher B. | |
2018-11-01 | |
发表期刊 | JOURNAL OF CLIMATE |
ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2018 |
卷号 | 31期号:22页码:9207-9224 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Many modeling studies have shown that the Atlantic meridional overturning circulation (AMOC) will weaken under increased greenhouse gas forcing, but the influence of AMOC internal variability on climate change in the context of a large initial condition ensemble has received less attention. Here, the Community Earth System Model Large Ensemble (CESM LE) is used to separate the AMOC-forced response from AMOC internal variability, and then assess their joint influence on surface warming. Similar to other models, the CESM LE projects a weakening AMOC in response to increased greenhouse gas forcing caused by freshening and decreased buoyancy fluxes in the North Atlantic. Yet if this forced response is removed using the ensemble mean, there is a positive relationship between global surface warming and AMOC strength. In other words, when the AMOC strengthens relative to the ensemble mean (i.e., weakens less), global surface warming increases relative to the ensemble mean response. This unforced surface warming occurs in northern Eurasia and in the Nordic and Barents Seas near the sea ice edge. Comparison of CESM simulations with and without a dynamic ocean shows that the unforced surface warming in the Nordic and Barents Seas results from both ocean and atmospheric circulation variability. In contrast, this comparison suggests that AMOC-associated Eurasian warming results from atmospheric circulation variability alone. In sum, the AMOC-forced response and AMOC internal variability have distinct relationships with surface temperature. Forced AMOC weakening decreases with surface warming, while unforced AMOC strengthening leads to surface warming. |
英文关键词 | Meridional overturning circulation Climate models Ensembles Climate variability |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000447608800002 |
WOS关键词 | OCEAN HEAT-TRANSPORT ; INTERTROPICAL CONVERGENCE ZONE ; TRANSIENT CLIMATE-CHANGE ; EARTH SYSTEM MODEL ; THERMOHALINE CIRCULATION ; MULTIDECADAL VARIABILITY ; DECADAL VARIABILITY ; LAST DEGLACIATION ; EUROPEAN CLIMATE ; BIPOLAR SEESAW |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/20312 |
专题 | 气候变化 |
作者单位 | 1.Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA; 2.Univ Colorado, Dept Atmospher & Ocean Sci, Boulder, CO 80309 USA |
推荐引用方式 GB/T 7714 | Maroon, Elizabeth A.,Kay, Jennifer E.,Karnauskas, Kristopher B.. Influence of the Atlantic Meridional Overturning Circulation on the Northern Hemisphere Surface Temperature Response to Radiative Forcing[J]. JOURNAL OF CLIMATE,2018,31(22):9207-9224. |
APA | Maroon, Elizabeth A.,Kay, Jennifer E.,&Karnauskas, Kristopher B..(2018).Influence of the Atlantic Meridional Overturning Circulation on the Northern Hemisphere Surface Temperature Response to Radiative Forcing.JOURNAL OF CLIMATE,31(22),9207-9224. |
MLA | Maroon, Elizabeth A.,et al."Influence of the Atlantic Meridional Overturning Circulation on the Northern Hemisphere Surface Temperature Response to Radiative Forcing".JOURNAL OF CLIMATE 31.22(2018):9207-9224. |
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