Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018GL080958 |
How Is Meridional Coherence Maintained in the Lower Limb of the Atlantic Meridional Overturning Circulation? | |
Zou, Sijia1; Lozier, M. Susan1; Buckley, Martha2 | |
2019-01-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
卷号 | 46期号:1页码:244-252 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Despite a strong focus on latitudinal continuity of the Atlantic Meridional Overturning Circulation (AMOC) variability, transport continuity in different layers that constitute the AMOC lower limb has received considerably less attention. In this study, we investigate the transport connectivity of Upper North Atlantic Deep Water (UNADW) and Lower NADW (LNADW), with both defined by density. Using two ocean circulation models and an ocean reanalysis, we find that subpolar-originated transport anomalies, particularly for UNADW, do not propagate to the subtropics over a period of five decades. We also find that transports in both layers are linked to AMOC at subpolar latitudes, yet only LNADW transport shows linkage to AMOC in the subtropical gyre. Thus, latitudinal AMOC continuity is likely unrelated to transport continuity in any single layer, but rather a result of connection between subpolar-AMOC and subtropical-LNADW transport. An exception to this generalization is possible with strong LNADW transport events. Plain Language Summary The importance of studying the Atlantic Meridional Overturning Circulation (AMOC), characterized as northward flowing upper waters and southward flowing deep waters, lies in its significant impacts on climate. The production of deep waters in the subpolar/subarctic North Atlantic (i.e., North Atlantic Deep Water or NADW) has been assumed to create coherent NADW transport changes across a range of latitudes. Such latitudinal transport coherence is thought to create a latitudinal coherent AMOC. However, though AMOC transport coherence has been widely discussed, no study to date has explored the latitudinal coherence of NADW or its relationship with AMOC. This study aims to fill this gap. We find that transport anomalies of NADW since the 1960s, specified by different density class, do not propagate coherently from the subpolar gyre to the subtropical gyre, suggesting that latitudinal AMOC coherence is unlikely achieved through coherent transport of these deep waters. Our study challenges the paradigm that the subtropical AMOC is strongly impacted by deep water production in the subpolar gyre and highlights the importance of local forcing on AMOC variability. Both results have implications for the ocean's role in climate variability. |
英文关键词 | North Atlantic Deep Waters Atlantic Meridional Overturning Circulation Meridional coherence of AMOC |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000456938600027 |
WOS关键词 | INTERANNUAL VARIABILITY ; OCEAN ; WATER ; REANALYSIS ; PATHWAYS ; EXPORT ; WIND |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
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/26014 |
专题 | 气候变化 |
作者单位 | 1.Duke Univ, Nicholas Sch Environm, Div Earth & Ocean Sci, Durham, NC 27708 USA; 2.George Mason Univ, Dept Atmospher Ocean & Earth Sci, Fairfax, VA 22030 USA |
推荐引用方式 GB/T 7714 | Zou, Sijia,Lozier, M. Susan,Buckley, Martha. How Is Meridional Coherence Maintained in the Lower Limb of the Atlantic Meridional Overturning Circulation?[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(1):244-252. |
APA | Zou, Sijia,Lozier, M. Susan,&Buckley, Martha.(2019).How Is Meridional Coherence Maintained in the Lower Limb of the Atlantic Meridional Overturning Circulation?.GEOPHYSICAL RESEARCH LETTERS,46(1),244-252. |
MLA | Zou, Sijia,et al."How Is Meridional Coherence Maintained in the Lower Limb of the Atlantic Meridional Overturning Circulation?".GEOPHYSICAL RESEARCH LETTERS 46.1(2019):244-252. |
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