The devil's in the disequilibrium : sensitivity of ocean carbon storage to climate state and iron fertilization in a general circulation model
Unidad de excelencia María de Maeztu MdM-2015-0552 Ocean dissolved inorganic carbon (DIC) storage can be conceptualized as the sum of four components: saturation (DICsat), disequilibrium (DICdis), carbonate (DICcarb) and soft tissue (DICsoft). Among these, DICdis and DICsoft have the potential for l...
Main Authors: | , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2018
|
Subjects: | |
Online Access: | https://ddd.uab.cat/record/187816 |
id |
ftuabarcelonapb:oai:ddd.uab.cat:187816 |
---|---|
record_format |
openpolar |
spelling |
ftuabarcelonapb:oai:ddd.uab.cat:187816 2023-05-15T14:03:00+02:00 The devil's in the disequilibrium : sensitivity of ocean carbon storage to climate state and iron fertilization in a general circulation model Eggleston, Sarah Galbraith, Eric 2018 application/pdf https://ddd.uab.cat/record/187816 eng eng Ministerio de Economía y Competitividad MDM-2015-0552 Biogeosciences Vol. 15 (2018), p. 3761-3777 https://ddd.uab.cat/record/187816 urn:10.5194/bg-2017-328 urn:oai:ddd.uab.cat:187816 urn:10.5194/bg-15-3761-2018 urn:altmetric_id:26311290 urn:oai:egreta.uab.cat:publications/1ca4304b-9865-451a-ac7f-b51100937339 urn:scopus_id:85048869311 open access Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original. https://creativecommons.org/licenses/by/4.0/ CC-BY Article 2018 ftuabarcelonapb 2023-02-06T21:13:44Z Unidad de excelencia María de Maeztu MdM-2015-0552 Ocean dissolved inorganic carbon (DIC) storage can be conceptualized as the sum of four components: saturation (DICsat), disequilibrium (DICdis), carbonate (DICcarb) and soft tissue (DICsoft). Among these, DICdis and DICsoft have the potential for large changes that are relatively difficult to predict. Here we explore changes in DICsoft and DICdis in a large suite of simulations with a complex coupled climate-biogeochemical model, driven by changes in orbital forcing, ice sheets and the radiative effect of CO₂. Both DICdis and DICsoft vary over a range of 40 μmol kg⁻¹ in response to the climate forcing, equivalent to changes in atmospheric CO₂ on the order of 50 ppm for each. We find that, despite the broad range of climate states represented, changes in global DICsoft can be well-approximated by the product of deep ocean ideal age and the global export production flux, while global DICdis is dominantly controlled by the fraction of the ocean filled by Antarctic Bottom Water (AABW). Because the AABW fraction and ideal age are inversely correlated between the simulations, DICdis and DICsoft are also inversely correlated. This inverse correlation could be decoupled if changes in deep ocean mixing were to alter ideal age independently of AABW fraction, or if independent ecosystem changes were to alter export and remineralization, thereby modifying DICsoft. As an example of the latter, iron fertilization causes DICsoft to increase, and causes DICdis to also increase by a similar or greater amount, to a degree that depends on climate state. We propose a simple framework to consider the global contribution of DICsoft + DICdis to ocean carbon storage as a function of the surface preformed nitrate and DICdis of dense water formation regions, the global volume fractions ventilated by these regions, and the global nitrate inventory. More extensive sea ice increases DICdis, and when sea ice becomes very extensive it also causes significant O₂ disequilibrium, which may ... Article in Journal/Newspaper Antarc* Antarctic Sea ice Universitat Autònoma de Barcelona: Dipòsit Digital de Documents de la UAB Antarctic |
institution |
Open Polar |
collection |
Universitat Autònoma de Barcelona: Dipòsit Digital de Documents de la UAB |
op_collection_id |
ftuabarcelonapb |
language |
English |
description |
Unidad de excelencia María de Maeztu MdM-2015-0552 Ocean dissolved inorganic carbon (DIC) storage can be conceptualized as the sum of four components: saturation (DICsat), disequilibrium (DICdis), carbonate (DICcarb) and soft tissue (DICsoft). Among these, DICdis and DICsoft have the potential for large changes that are relatively difficult to predict. Here we explore changes in DICsoft and DICdis in a large suite of simulations with a complex coupled climate-biogeochemical model, driven by changes in orbital forcing, ice sheets and the radiative effect of CO₂. Both DICdis and DICsoft vary over a range of 40 μmol kg⁻¹ in response to the climate forcing, equivalent to changes in atmospheric CO₂ on the order of 50 ppm for each. We find that, despite the broad range of climate states represented, changes in global DICsoft can be well-approximated by the product of deep ocean ideal age and the global export production flux, while global DICdis is dominantly controlled by the fraction of the ocean filled by Antarctic Bottom Water (AABW). Because the AABW fraction and ideal age are inversely correlated between the simulations, DICdis and DICsoft are also inversely correlated. This inverse correlation could be decoupled if changes in deep ocean mixing were to alter ideal age independently of AABW fraction, or if independent ecosystem changes were to alter export and remineralization, thereby modifying DICsoft. As an example of the latter, iron fertilization causes DICsoft to increase, and causes DICdis to also increase by a similar or greater amount, to a degree that depends on climate state. We propose a simple framework to consider the global contribution of DICsoft + DICdis to ocean carbon storage as a function of the surface preformed nitrate and DICdis of dense water formation regions, the global volume fractions ventilated by these regions, and the global nitrate inventory. More extensive sea ice increases DICdis, and when sea ice becomes very extensive it also causes significant O₂ disequilibrium, which may ... |
format |
Article in Journal/Newspaper |
author |
Eggleston, Sarah Galbraith, Eric |
spellingShingle |
Eggleston, Sarah Galbraith, Eric The devil's in the disequilibrium : sensitivity of ocean carbon storage to climate state and iron fertilization in a general circulation model |
author_facet |
Eggleston, Sarah Galbraith, Eric |
author_sort |
Eggleston, Sarah |
title |
The devil's in the disequilibrium : sensitivity of ocean carbon storage to climate state and iron fertilization in a general circulation model |
title_short |
The devil's in the disequilibrium : sensitivity of ocean carbon storage to climate state and iron fertilization in a general circulation model |
title_full |
The devil's in the disequilibrium : sensitivity of ocean carbon storage to climate state and iron fertilization in a general circulation model |
title_fullStr |
The devil's in the disequilibrium : sensitivity of ocean carbon storage to climate state and iron fertilization in a general circulation model |
title_full_unstemmed |
The devil's in the disequilibrium : sensitivity of ocean carbon storage to climate state and iron fertilization in a general circulation model |
title_sort |
devil's in the disequilibrium : sensitivity of ocean carbon storage to climate state and iron fertilization in a general circulation model |
publishDate |
2018 |
url |
https://ddd.uab.cat/record/187816 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Sea ice |
genre_facet |
Antarc* Antarctic Sea ice |
op_relation |
Ministerio de Economía y Competitividad MDM-2015-0552 Biogeosciences Vol. 15 (2018), p. 3761-3777 https://ddd.uab.cat/record/187816 urn:10.5194/bg-2017-328 urn:oai:ddd.uab.cat:187816 urn:10.5194/bg-15-3761-2018 urn:altmetric_id:26311290 urn:oai:egreta.uab.cat:publications/1ca4304b-9865-451a-ac7f-b51100937339 urn:scopus_id:85048869311 |
op_rights |
open access Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original. https://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
_version_ |
1766273447022821376 |