Can the salt-advection feedback be detected in internal variability of the Atlantic Meridional Overturning Circulation? Can the salt-advection feedback be detected in internal variability of the Atlantic Meridional Overturning Circulation?
Evidence for the assumptions of the salt-advection feedback in box models is sought by studying the Atlantic meridional overturning circulation (AMOC) internal variability in the long preindustrial control runs of two Earth system models. The first assumption is that AMOC strength is proportional to...
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ftcdlib:oai:escholarship.org:ark:/13030/qt75165150 2023-06-18T03:41:57+02:00 Can the salt-advection feedback be detected in internal variability of the Atlantic Meridional Overturning Circulation? Can the salt-advection feedback be detected in internal variability of the Atlantic Meridional Overturning Circulation? Cheng, Wei Weijer, Wilbert Kim, Who M Danabasoglu, Gokhan Yeager, Steve G Gent, Peter R Zhang, Dongxiao Chiang, John CH Zhang, Jiaxu 6649 - 6667 2018-08-01 application/pdf https://escholarship.org/uc/item/75165150 unknown eScholarship, University of California qt75165150 https://escholarship.org/uc/item/75165150 public Journal of Climate, vol 31, iss 16 Feedback Meridional overturning circulation Coupled models Model output statistics Numerical analysis modeling Oceanic variability Atmospheric Sciences Oceanography Geomatic Engineering Meteorology & Atmospheric Sciences article 2018 ftcdlib 2023-06-05T17:59:49Z Evidence for the assumptions of the salt-advection feedback in box models is sought by studying the Atlantic meridional overturning circulation (AMOC) internal variability in the long preindustrial control runs of two Earth system models. The first assumption is that AMOC strength is proportional to the meridional density difference between the North Atlantic and the Southern Oceans. The model simulations support this assumption, with the caveat that nearly all the long time-scale variability occurs in the North Atlantic density. The second assumption is that the freshwater transport variability by the overturning at the Atlantic southern boundary is controlled by the strength of AMOC. Only one of the models shows some evidence that AMOC variability at 45°N leads variability in the overturning freshwater transport at the southern boundary by about 30 years, but the other model shows no such coherence. In contrast, in both models this freshwater transport variability is dominated by local salinity variations. The third assumption is that changes in the overturning freshwater transport at the Atlantic southern boundary perturb the north-south density difference, and thus feed back on AMOC strength in the north. No evidence for this assumption is found in either model at any time scale, although this does not rule out that the salt-advection feedback may be excited by a strong enough freshwater perturbation. Article in Journal/Newspaper North Atlantic University of California: eScholarship |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Feedback Meridional overturning circulation Coupled models Model output statistics Numerical analysis modeling Oceanic variability Atmospheric Sciences Oceanography Geomatic Engineering Meteorology & Atmospheric Sciences |
spellingShingle |
Feedback Meridional overturning circulation Coupled models Model output statistics Numerical analysis modeling Oceanic variability Atmospheric Sciences Oceanography Geomatic Engineering Meteorology & Atmospheric Sciences Cheng, Wei Weijer, Wilbert Kim, Who M Danabasoglu, Gokhan Yeager, Steve G Gent, Peter R Zhang, Dongxiao Chiang, John CH Zhang, Jiaxu Can the salt-advection feedback be detected in internal variability of the Atlantic Meridional Overturning Circulation? Can the salt-advection feedback be detected in internal variability of the Atlantic Meridional Overturning Circulation? |
topic_facet |
Feedback Meridional overturning circulation Coupled models Model output statistics Numerical analysis modeling Oceanic variability Atmospheric Sciences Oceanography Geomatic Engineering Meteorology & Atmospheric Sciences |
description |
Evidence for the assumptions of the salt-advection feedback in box models is sought by studying the Atlantic meridional overturning circulation (AMOC) internal variability in the long preindustrial control runs of two Earth system models. The first assumption is that AMOC strength is proportional to the meridional density difference between the North Atlantic and the Southern Oceans. The model simulations support this assumption, with the caveat that nearly all the long time-scale variability occurs in the North Atlantic density. The second assumption is that the freshwater transport variability by the overturning at the Atlantic southern boundary is controlled by the strength of AMOC. Only one of the models shows some evidence that AMOC variability at 45°N leads variability in the overturning freshwater transport at the southern boundary by about 30 years, but the other model shows no such coherence. In contrast, in both models this freshwater transport variability is dominated by local salinity variations. The third assumption is that changes in the overturning freshwater transport at the Atlantic southern boundary perturb the north-south density difference, and thus feed back on AMOC strength in the north. No evidence for this assumption is found in either model at any time scale, although this does not rule out that the salt-advection feedback may be excited by a strong enough freshwater perturbation. |
format |
Article in Journal/Newspaper |
author |
Cheng, Wei Weijer, Wilbert Kim, Who M Danabasoglu, Gokhan Yeager, Steve G Gent, Peter R Zhang, Dongxiao Chiang, John CH Zhang, Jiaxu |
author_facet |
Cheng, Wei Weijer, Wilbert Kim, Who M Danabasoglu, Gokhan Yeager, Steve G Gent, Peter R Zhang, Dongxiao Chiang, John CH Zhang, Jiaxu |
author_sort |
Cheng, Wei |
title |
Can the salt-advection feedback be detected in internal variability of the Atlantic Meridional Overturning Circulation? Can the salt-advection feedback be detected in internal variability of the Atlantic Meridional Overturning Circulation? |
title_short |
Can the salt-advection feedback be detected in internal variability of the Atlantic Meridional Overturning Circulation? Can the salt-advection feedback be detected in internal variability of the Atlantic Meridional Overturning Circulation? |
title_full |
Can the salt-advection feedback be detected in internal variability of the Atlantic Meridional Overturning Circulation? Can the salt-advection feedback be detected in internal variability of the Atlantic Meridional Overturning Circulation? |
title_fullStr |
Can the salt-advection feedback be detected in internal variability of the Atlantic Meridional Overturning Circulation? Can the salt-advection feedback be detected in internal variability of the Atlantic Meridional Overturning Circulation? |
title_full_unstemmed |
Can the salt-advection feedback be detected in internal variability of the Atlantic Meridional Overturning Circulation? Can the salt-advection feedback be detected in internal variability of the Atlantic Meridional Overturning Circulation? |
title_sort |
can the salt-advection feedback be detected in internal variability of the atlantic meridional overturning circulation? can the salt-advection feedback be detected in internal variability of the atlantic meridional overturning circulation? |
publisher |
eScholarship, University of California |
publishDate |
2018 |
url |
https://escholarship.org/uc/item/75165150 |
op_coverage |
6649 - 6667 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Journal of Climate, vol 31, iss 16 |
op_relation |
qt75165150 https://escholarship.org/uc/item/75165150 |
op_rights |
public |
_version_ |
1769007699385647104 |