Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JCLI-D-18-0519.1 |
Antarctic Sea Ice Control on the Depth of North Atlantic Deep Water | |
Nadeau, Louis-Philippe1; Ferrari, Raffaele2; Jansen, Malte F.3 | |
2019-05-01 | |
发表期刊 | JOURNAL OF CLIMATE |
ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2019 |
卷号 | 32期号:9页码:2537-2551 |
文章类型 | Article |
语种 | 英语 |
国家 | Canada; USA |
英文摘要 | Changes in deep-ocean circulation and stratification have been argued to contribute to climatic shifts between glacial and interglacial climates by affecting the atmospheric carbon dioxide concentrations. It has been recently proposed that such changes are associated with variations in Antarctic sea ice through two possible mechanisms: an increased latitudinal extent of Antarctic sea ice and an increased rate of Antarctic sea ice formation. Both mechanisms lead to an upward shift of the Atlantic meridional overturning circulation (AMOC) above depths where diapycnal mixing is strong (above 2000 m), thus decoupling the AMOC from the abyssal overturning circulation. Here, these two hypotheses are tested using a series of idealized two-basin ocean simulations. To investigate independently the effect of an increased latitudinal ice extent from the effect of an increased ice formation rate, sea ice is parameterized as a latitude strip over which the buoyancy flux is negative. The results suggest that both mechanisms can effectively decouple the two cells of the meridional overturning circulation (MOC), and that their effects are additive. To illustrate the role of Antarctic sea ice in decoupling the AMOC and the abyssal overturning cell, the age of deep-water masses is estimated. An increase in both the sea ice extent and its formation rate yields a dramatic "aging" of deep-water masses if the sea ice is thick and acts as a lid, suppressing air-sea fluxes. The key role of vertical mixing is highlighted by comparing results using different profiles of vertical diffusivity. The implications of an increase in water mass ages for storing carbon in the deep ocean are discussed. |
英文关键词 | Ocean Sea ice Abyssal circulation Meridional overturning circulation Ice loss growth Paleoclimate |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000465136000002 |
WOS关键词 | LAST GLACIAL MAXIMUM ; SOUTHERN-OCEAN ; OVERTURNING CIRCULATION ; ATMOSPHERIC CO2 ; MODEL ; DRIVEN ; STRATIFICATION ; TEMPERATURE ; VENTILATION ; DELTA-O-18 |
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/182989 |
专题 | 气候变化 |
作者单位 | 1.Univ Quebec Rimouski, Inst Sci Mer Rimouski, Rimouski, PQ, Canada; 2.MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA USA; 3.Univ Chicago, Dept Geophys Sci, 5734 S Ellis Ave, Chicago, IL 60637 USA |
推荐引用方式 GB/T 7714 | Nadeau, Louis-Philippe,Ferrari, Raffaele,Jansen, Malte F.. Antarctic Sea Ice Control on the Depth of North Atlantic Deep Water[J]. JOURNAL OF CLIMATE,2019,32(9):2537-2551. |
APA | Nadeau, Louis-Philippe,Ferrari, Raffaele,&Jansen, Malte F..(2019).Antarctic Sea Ice Control on the Depth of North Atlantic Deep Water.JOURNAL OF CLIMATE,32(9),2537-2551. |
MLA | Nadeau, Louis-Philippe,et al."Antarctic Sea Ice Control on the Depth of North Atlantic Deep Water".JOURNAL OF CLIMATE 32.9(2019):2537-2551. |
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