| Reconsidering Melt-water Pulses 1A and 1B： Global Impacts of Rapid Sea-level Rise |
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| 作者姓名： | J.PaulLiu JohnD.Milliman |
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| 作者单位： | [1]DepartmentofMarine,EarthandAtmosphereSciences,NorthCarolinaStateUniversity,Raleigh,NC,27695,USA [2]SchoolofMarineScience,CollegeofWilliamandMary,GloucesterPoint,VA,23062,USA |
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| 摘 要： | Re-evaluation of the post-glacial sea level derived from the Barbados coral-reef borings suggests slightly revised depth ranges and timing of melt-water pulses MWP-1A (96-76m, 14.3-14.0ka cal BP) and 1B (58-45 m, 11.5-11.2ka cal BP), respectively. Ages of non-reef sea-level indicators from the Sunda Shelf, the East China Sea and Yellow Sea for these two intervals are unreliable because of the well-documented radiocarbon (^14C) plateau, but their vertical clustering corresponds closely with MWP-1A and 1B depth ranges. Close correlation of the revised sea-level curve with Greenland ice-core data suggests that the ^14C plateau may be related to oceanographic-atmospheric changes due to rapid sea-level rise, fresh-water input, and impaired ocean circulation. MWP-1A appears to have occurred at the end of Bφlling Warm Transition, suggesting that the rapid sea-level rise may have resulted from lateral heat transport from low to high-latitude regions and subsequent abrupt ice-sheet collapses in both North America-Europe and Antarctica. An around 70 mma^-1 transgression during MWP-1A may have increased freshwater discharge to the North Atlantic by as much as an order of magnitude, thereby disturbing thermohaline circulation and initiating the Older Dryas global cooling.
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| 关 键 词： | 水软化频率 碳同位素 珊瑚礁 海平面升降 |
| 收稿时间： | 5 August 2004 |
| 修稿时间： | 8 September 2004 |
Reconsidering melt-water pulses 1A and 1B: Global impacts of rapid sea-level rise |
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| J.PaulLiu JohnD.Milliman.Reconsidering melt-water pulses 1A and 1B: Global impacts of rapid sea-level rise[J].Journal of Ocean University of China,2004,3(2):183-190. |
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| Authors: | Email author" target="_blank">J?Paul?LiuEmail author John?D?Milliman |
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| Institution: | 1. Department of Marine, Earth and Atmosphere Sciences, North Carolina State University, Raleigh, NC, 27695, USA
2. School of Marine Science, College of William and Mary, Gloucester Point, VA, 23062, USA |
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| Abstract: | Re-evaluation of the post-glacial sea level derived from the Barbados coral-reef borings suggests slightly revised depth ranges and timing of melt-water pulses MWP-1A (96–76m, 14.3–14.0ka cal BP) and IB (58–45m, 11.5–11.2ka cal BP), respectively. Ages of non-reef sea-level indicators from the Sunda Shelf, the East China Sea and Yellow Sea for these two intervals are unreliable because of the well-documented radiocarbon (14C) plateau, but their vertical clustering corresponds closely with MWP-1A and IB depth ranges. Close correlation of the revised sea-level curve with Greenland ice-core data suggests that the 14C plateau may be related to oceanographic-atmospheric changes due to rapid sea-level rise, fresh-water input, and impaired ocean circulation. MWP-1A appears to have occurred at the end of Bølling Warm Transition, suggesting that the rapid sea-level rise may have resulted from lateral heat transport from low to high-latitude regions and subsequent abrupt ice-sheet collapses in both North America-Europe and Antarctica. An around 70 mm a?1 transgression during MWP-1A may have increased freshwater discharge to the North Atlantic by as much as an order of magnitude, thereby disturbing thermohaline circulation and initiating the Older Dry as global cooling. |
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| Keywords: | melt-water pulse MWP-1A sea-level 14C plateau coral reef B?lling Transition |
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