DOI: 10.1007/s00382-015-2876-7
Scopus记录号: 2-s2.0-84945162485
论文题名: Evolution of the deep Atlantic water masses since the last glacial maximum based on a transient run of NCAR-CCSM3
作者: Marson J.M. ; Mysak L.A. ; Mata M.M. ; Wainer I.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2016
卷: 47, 期: 2017-03-04 起始页码: 865
结束页码: 877
语种: 英语
英文关键词: Meltwater
; Millennial time scale
; MOC
; Modeling climate change
; Paleoceanography
英文摘要: During the last deglaciation (from approximately 21 to 11 thousand years ago), the high latitudes of the Atlantic Ocean underwent major changes. Besides the continuous warming, the polar and subpolar ocean surface received a large amount of meltwater from the retracting ice sheets. These changes in temperature and salinity affected deep waters, such as the Antarctic Bottom Water (AABW) and the North Atlantic Deep Water (NADW), which are formed in the Southern Ocean and in the northern North Atlantic, respectively. In this study, we present the evolution of the physical properties and distribution of the AABW and the NADW since the last glacial maximum using the results of a transient simulation with NCAR-CCSM3. In this particular model scenario with a schematic freshwater forcing, we find that modern NADW, with its characteristic salinity maximum at depth, was absent in the beginning of the deglaciation, while its intermediate version—Glacial North Atlantic Intermediate Water (GNAIW)—was being formed. GNAIW was a cold and relatively fresh water mass that dominated intermediate depths between 60 and 20°N. At this time, most of the deep and abyssal Atlantic basin was dominated by AABW. Within the onset of the Bølling-Allerød period, at nearly 15 thousand years ago (ka), GNAIW expanded southwards when the simulated Meridional Overturning Circulation overshoots. The transition between GNAIW and NADW ocurred after that, when AABW was fresh enough to allow NADW to sink deeper in the water column. When the NADW appears (~11 ka), AABW retracts and is constrained to lie near the bottom. © 2015, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53614
Appears in Collections: 过去全球变化的重建
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作者单位: Instituto Oceanográfico, Universidade de São Paulo, São Paulo, SP, Brazil; Department of Atmospheric and Oceanic Sciences, McGill University, Montréal, Canada; Instituto de Oceanografia, Universidade Federal do Rio Grande - FURG, Rio Grande, RS, Brazil
Recommended Citation:
Marson J.M.,Mysak L.A.,Mata M.M.,et al. Evolution of the deep Atlantic water masses since the last glacial maximum based on a transient run of NCAR-CCSM3[J]. Climate Dynamics,2016-01-01,47(2017-03-04)