The effect of model freshwater flux biases on the multi-stable regime of the AMOC ...
It is known that global climate models (GCMs) have substantial biases in the surface freshwater flux which forces the ocean component of these models. Using numerical bifurcation analyses on a global ocean model, we study here the effect of a specific freshwater flux bias on the multiple equilibrium...
Main Authors: | , |
---|---|
Format: | Report |
Language: | unknown |
Published: |
arXiv
2023
|
Subjects: | |
Online Access: | https://dx.doi.org/10.48550/arxiv.2308.11751 https://arxiv.org/abs/2308.11751 |
id |
ftdatacite:10.48550/arxiv.2308.11751 |
---|---|
record_format |
openpolar |
spelling |
ftdatacite:10.48550/arxiv.2308.11751 2023-10-01T03:57:52+02:00 The effect of model freshwater flux biases on the multi-stable regime of the AMOC ... Dijkstra, Henk A. van Westen, Rene M. 2023 https://dx.doi.org/10.48550/arxiv.2308.11751 https://arxiv.org/abs/2308.11751 unknown arXiv Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 Atmospheric and Oceanic Physics physics.ao-ph FOS Physical sciences Preprint article Article CreativeWork 2023 ftdatacite https://doi.org/10.48550/arxiv.2308.11751 2023-09-04T14:56:22Z It is known that global climate models (GCMs) have substantial biases in the surface freshwater flux which forces the ocean component of these models. Using numerical bifurcation analyses on a global ocean model, we study here the effect of a specific freshwater flux bias on the multiple equilibrium regime of the Atlantic Meridional Overturning Circulation (AMOC). We find that a (positive) freshwater flux bias over the Indian Ocean shifts the multiple equilibrium regime to larger values of North Atlantic freshwater input but hardly affects the associated hysteresis width. The magnitude of this shift depends on the way the anomalous North Atlantic freshwater flux is compensated. We explain the changes in bifurcation diagrams using the freshwater balance over the Atlantic basin. The results suggest that state-of-the-art GCMs may have an AMOC multiple equilibrium regime, but that it is located in a parameter regime that is considered unrealistic and hence is not explored. ... Report North Atlantic DataCite Metadata Store (German National Library of Science and Technology) Indian |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Atmospheric and Oceanic Physics physics.ao-ph FOS Physical sciences |
spellingShingle |
Atmospheric and Oceanic Physics physics.ao-ph FOS Physical sciences Dijkstra, Henk A. van Westen, Rene M. The effect of model freshwater flux biases on the multi-stable regime of the AMOC ... |
topic_facet |
Atmospheric and Oceanic Physics physics.ao-ph FOS Physical sciences |
description |
It is known that global climate models (GCMs) have substantial biases in the surface freshwater flux which forces the ocean component of these models. Using numerical bifurcation analyses on a global ocean model, we study here the effect of a specific freshwater flux bias on the multiple equilibrium regime of the Atlantic Meridional Overturning Circulation (AMOC). We find that a (positive) freshwater flux bias over the Indian Ocean shifts the multiple equilibrium regime to larger values of North Atlantic freshwater input but hardly affects the associated hysteresis width. The magnitude of this shift depends on the way the anomalous North Atlantic freshwater flux is compensated. We explain the changes in bifurcation diagrams using the freshwater balance over the Atlantic basin. The results suggest that state-of-the-art GCMs may have an AMOC multiple equilibrium regime, but that it is located in a parameter regime that is considered unrealistic and hence is not explored. ... |
format |
Report |
author |
Dijkstra, Henk A. van Westen, Rene M. |
author_facet |
Dijkstra, Henk A. van Westen, Rene M. |
author_sort |
Dijkstra, Henk A. |
title |
The effect of model freshwater flux biases on the multi-stable regime of the AMOC ... |
title_short |
The effect of model freshwater flux biases on the multi-stable regime of the AMOC ... |
title_full |
The effect of model freshwater flux biases on the multi-stable regime of the AMOC ... |
title_fullStr |
The effect of model freshwater flux biases on the multi-stable regime of the AMOC ... |
title_full_unstemmed |
The effect of model freshwater flux biases on the multi-stable regime of the AMOC ... |
title_sort |
effect of model freshwater flux biases on the multi-stable regime of the amoc ... |
publisher |
arXiv |
publishDate |
2023 |
url |
https://dx.doi.org/10.48550/arxiv.2308.11751 https://arxiv.org/abs/2308.11751 |
geographic |
Indian |
geographic_facet |
Indian |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_doi |
https://doi.org/10.48550/arxiv.2308.11751 |
_version_ |
1778530006095364096 |