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Volumn 299, Issue 5613, 2003, Pages 1709-1713

Meltwater pulse 1A from Antarctica as a trigger of the Bølling-Allerød warm interval

Author keywords

[No Author keywords available]

Indexed keywords

GLACIERS; ICE; SEA LEVEL;

EID: 0037436549     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.1081002     Document Type: Article
Times cited : (426)

References (44)
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    • note
    • Two U/Th ages on A. palmata were obtained from near the top of Barbados core RGF-9: 14,690 ± 85 yr B.P. (RGF9-13-3) and 14,230 ± 100 yr B.P. (RGF9-8-2). When the long-term uplift rate of Barbados is accounted for (0.34 m/kyear) (1), the difference in elevation between the two samples represents a relative sea-level rise of 5.5 m. However, given the conventional waterdepth uncertainty constrained by this species (within 6 m of sea level), a maximum rise in relative sea level of 11.5 m, or more than half the rise associated with mwp-1A, is possible. The youngest dated sample of A. palamata (RGF9-8-2) is overlain by deep-water species Porites astroides and A. cervicornis, suggesting that the 14,230 kyr B.P. horizon was already in the process of drowning in response to rapidly rising sea level This sample may thus have been well below its normal 6-m water-depth tolerance at the time it grew, allowing more than 11.5 m of relative sea-level rise since 14,690 ± 85 yr B.P.
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    • 2 is externally imposed as a reduction of the planetary long-wave radiative flux. The ocean component of the coupled model is a fully nonlinear 3D ocean GCM with a global resolution of 3.6° (zonal) by 1.8° (meridional) and 19 vertical levels. It includes the parameterization of Gent and McWilliams to represent the effect of mixing associated with mesoscale eddies. The sea-ice model incorporates an elastic-viscous-plastic rheology representation of dynamics, a two-category thickness distribution, and ice-snow thermodynamics. The model resolves the annual cycle, and the incoming solar radiation at the top of the atmosphere depends on the orbital parameters. One of the virtues of the coupled model is that we do not need to use explicit flux adjustments to keep the simulation of the present climate stable.
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    • note
    • We are grateful for funding from the Natural Sciences and Engineering Research Council via the operating and Climate System History and Dynamics programs and for research support from the Canadian Foundation for Climate and Atmospheric Sciences. This research was also made possible through support from the Killam Foundation and the Canada Research Chair program to A.J.W. and from the Earth System History Program of NSF to P.U.C. We also acknowledge discussions with J. Gregory and M. Kienast and are grateful for the insightful comments of two anonymous reviewers.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.