Ocean-climate variability and sea level in the North Atlantic region since AD 0
Abstract niet beschikbaar We used reconstructed and model-simulated sea-level variations during the past 1000-3000 years to investigate their cause(s) and assess their suitability as proxy for ocean-related climate variations in the North Atlantic region. We studied salt-marsh deposits in North Caro...
Main Authors: | , , , , , , |
---|---|
Other Authors: | |
Format: | Report |
Language: | English |
Published: |
Vrije Universiteit amsterdam
2012
|
Subjects: | |
Online Access: | http://hdl.handle.net/10029/260638 |
id |
ftrivm:oai:rivm.openrepository.com:10029/260638 |
---|---|
record_format |
openpolar |
spelling |
ftrivm:oai:rivm.openrepository.com:10029/260638 2023-05-15T17:23:04+02:00 Ocean-climate variability and sea level in the North Atlantic region since AD 0 Oceaan-gerelateerde klimaatvariaties en zeespiegelvariaties in de noord-atlantische regio vanaf AD 0 Plassche O van de Edwards RJ Wright AJ Weber SL Schrier G van der Drijfhout SS Gehrels WR NOP 2012-12-12T21:01:47Z 101 p http://hdl.handle.net/10029/260638 en eng Vrije Universiteit amsterdam The Netherlands KNMI De Bilt University of Plymouth United Kingdom Global Change NOP-NRP report 410200086 http://www.rivm.nl/bibliotheek/rapporten/410200086.html 410200086 90 5851 083 2 http://hdl.handle.net/10029/260638 04 klimaatverandering zeeen waterstand lange termijn geschiedenis analyse climatic changes seas water levels long term history analysis ad 0 Onderzoeksrapport 2012 ftrivm 2020-09-03T18:22:45Z Abstract niet beschikbaar We used reconstructed and model-simulated sea-level variations during the past 1000-3000 years to investigate their cause(s) and assess their suitability as proxy for ocean-related climate variations in the North Atlantic region. We studied salt-marsh deposits in North Carolina, Connecticut, Newfoundland, and Wales (UK). Sea-level reconstructions obtained so far (for Connecticut) show that mean high water varied on centennial and sub-centennial timescales on the order of cms-dms during the past 3000 years. The mean high water fluctuations correlate more or less positively with proxy records of temperature change, but this broad correlation does not hold for the entire record. The most significant correlation found is a consistent phase shift of ca. 125 years between changes in solar activity (as expressed in variations in residual delta 14C) and sea level, suggesting a linkage by one or more mechanisms with a corresponding response time. The fact that sea level continued to fluctuate during periods of low solar variability indicates, however, that other factors are also involved.Sea-level change due to changes in the thermohaline structure of the North Atlantic ocean has been calculated using a coupled ocean-atmosphere model of intermediate complexity (ECBilt). Two 1000-yr simulations are made, one using a constant solar forcing and one using an estimate of historic solar activity. In the solar forced simulation, sea-level variations are a proxy for climate variations. Anomalies in sea-surface temperature (SST) of the northern North Atlantic are generated by the solar radiation changes. These SST anomalies modulate the ocean thermohaline circulation, affecting surface salinities in the northern North Atlantic which are subsequently advected to the deep ocean. The associated deep ocean geopotential thickness anomalies dominate sea level in the northern North Atlantic. Comparison of the simulated steric sea-level variations in the Gulf Stream area for the past 1000 yr with the corresponding part of the mean high water reconstruction for Connecticut shows a satisfactory agreement, indicating that deep ocean salinity anomalies in the northern North Atlantic, induced by changes in irradiance, largely explains the timing of reconstructed mean high water variations. This result has relevance for predictions of sea-level change. SG-NOP Report Newfoundland North Atlantic National Inst. for Public Health and the Environment, Netherlands (RIVM): Webbased Archive of RIVM Publications (WARP) |
institution |
Open Polar |
collection |
National Inst. for Public Health and the Environment, Netherlands (RIVM): Webbased Archive of RIVM Publications (WARP) |
op_collection_id |
ftrivm |
language |
English |
topic |
04 klimaatverandering zeeen waterstand lange termijn geschiedenis analyse climatic changes seas water levels long term history analysis ad 0 |
spellingShingle |
04 klimaatverandering zeeen waterstand lange termijn geschiedenis analyse climatic changes seas water levels long term history analysis ad 0 Plassche O van de Edwards RJ Wright AJ Weber SL Schrier G van der Drijfhout SS Gehrels WR Ocean-climate variability and sea level in the North Atlantic region since AD 0 |
topic_facet |
04 klimaatverandering zeeen waterstand lange termijn geschiedenis analyse climatic changes seas water levels long term history analysis ad 0 |
description |
Abstract niet beschikbaar We used reconstructed and model-simulated sea-level variations during the past 1000-3000 years to investigate their cause(s) and assess their suitability as proxy for ocean-related climate variations in the North Atlantic region. We studied salt-marsh deposits in North Carolina, Connecticut, Newfoundland, and Wales (UK). Sea-level reconstructions obtained so far (for Connecticut) show that mean high water varied on centennial and sub-centennial timescales on the order of cms-dms during the past 3000 years. The mean high water fluctuations correlate more or less positively with proxy records of temperature change, but this broad correlation does not hold for the entire record. The most significant correlation found is a consistent phase shift of ca. 125 years between changes in solar activity (as expressed in variations in residual delta 14C) and sea level, suggesting a linkage by one or more mechanisms with a corresponding response time. The fact that sea level continued to fluctuate during periods of low solar variability indicates, however, that other factors are also involved.Sea-level change due to changes in the thermohaline structure of the North Atlantic ocean has been calculated using a coupled ocean-atmosphere model of intermediate complexity (ECBilt). Two 1000-yr simulations are made, one using a constant solar forcing and one using an estimate of historic solar activity. In the solar forced simulation, sea-level variations are a proxy for climate variations. Anomalies in sea-surface temperature (SST) of the northern North Atlantic are generated by the solar radiation changes. These SST anomalies modulate the ocean thermohaline circulation, affecting surface salinities in the northern North Atlantic which are subsequently advected to the deep ocean. The associated deep ocean geopotential thickness anomalies dominate sea level in the northern North Atlantic. Comparison of the simulated steric sea-level variations in the Gulf Stream area for the past 1000 yr with the corresponding part of the mean high water reconstruction for Connecticut shows a satisfactory agreement, indicating that deep ocean salinity anomalies in the northern North Atlantic, induced by changes in irradiance, largely explains the timing of reconstructed mean high water variations. This result has relevance for predictions of sea-level change. SG-NOP |
author2 |
NOP |
format |
Report |
author |
Plassche O van de Edwards RJ Wright AJ Weber SL Schrier G van der Drijfhout SS Gehrels WR |
author_facet |
Plassche O van de Edwards RJ Wright AJ Weber SL Schrier G van der Drijfhout SS Gehrels WR |
author_sort |
Plassche O van de |
title |
Ocean-climate variability and sea level in the North Atlantic region since AD 0 |
title_short |
Ocean-climate variability and sea level in the North Atlantic region since AD 0 |
title_full |
Ocean-climate variability and sea level in the North Atlantic region since AD 0 |
title_fullStr |
Ocean-climate variability and sea level in the North Atlantic region since AD 0 |
title_full_unstemmed |
Ocean-climate variability and sea level in the North Atlantic region since AD 0 |
title_sort |
ocean-climate variability and sea level in the north atlantic region since ad 0 |
publisher |
Vrije Universiteit amsterdam |
publishDate |
2012 |
url |
http://hdl.handle.net/10029/260638 |
genre |
Newfoundland North Atlantic |
genre_facet |
Newfoundland North Atlantic |
op_relation |
Global Change NOP-NRP report 410200086 http://www.rivm.nl/bibliotheek/rapporten/410200086.html 410200086 90 5851 083 2 http://hdl.handle.net/10029/260638 |
_version_ |
1766110115204694016 |