期刊
QUATERNARY SCIENCE REVIEWS
卷 137, 期 -, 页码 54-68出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.quascirev.2016.02.002
关键词
Holocene sea level; Eustatic sea level; Antarctic ice sheet glacial isostatic; Adjustment modelling
资金
- Netherlands Earth System Science Centre (NESSC)
- Ministry of Education, Culture and Science (OCW)
- Natural Sciences and Engineering Research Council of Canada
- Canada Research Chairs Program
- National Science Foundation [EAR 0809392, 1458904]
- Directorate For Geosciences
- Division Of Ocean Sciences [1458904] Funding Source: National Science Foundation
This study presents a new model of Holocene ice-volume equivalent sea level (ESL), extending a previously published global ice sheet model (Bassett et al., 2005), which was unconstrained from 10 kyr BP to present. This new model was developed by comparing relative sea level (RSL) predictions from a glacial isostatic adjustment (GIA) model to a suite of Holocene sea level index points from China and Malay-Thailand. Three consistent data-model misfits were found using the Bassett et al. (2005) model: an over-prediction in the height of maximum sea level, the timing of this maximum, and the temporal variation of sea level from the time of the highstand to present. The data-model misfits were examined for a large suite of ESL scenarios and a range of earth model parameters to determine an optimum model of Holocene ESL. This model is characterised by a slowdown in melting at similar to 7 kyr BP, associated with the final deglaciation of the Laurentide Ice Sheet, followed by a continued rise in ESL until similar to 1 kyr BP of similar to 5.8 m associated with melting from the Antarctic Ice Sheet. It was not possible to identify an earth viscosity model that provided good fits for both regions; with the China data preferring viscosity values in the upper mantle of less than 1.5 x 10(20) Pa s and the Malay Thailand data preferring greater values. We suggest that this inference of a very weak upper mantle for the China data originates from the nearby subduction zone and Hainan Plume. The low viscosity values may also account for the lack of a well-defined highstand at the China sites. (C) 2016 Elsevier Ltd. All rights reserved.
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