Connecting Direct Effects of CO2 Radiative Forcing to Ocean Heat Uptake and Circulation
Abstract The ocean's response to direct atmospheric effects of increased carbon dioxide's (CO2) radiative forcing is examined. These direct effects are defined as the climate changes that result from forcing on a fast time scale of about a year, independent of the slower surface warming th...
Published in: | Journal of Advances in Modeling Earth Systems |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
American Geophysical Union (AGU)
2019
|
Subjects: | |
Online Access: | https://doi.org/10.1029/2018MS001544 https://doaj.org/article/b951ba5477b647ddb87ce2bae90e4e65 |
id |
ftdoajarticles:oai:doaj.org/article:b951ba5477b647ddb87ce2bae90e4e65 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:b951ba5477b647ddb87ce2bae90e4e65 2023-05-15T18:25:34+02:00 Connecting Direct Effects of CO2 Radiative Forcing to Ocean Heat Uptake and Circulation Molly E. Menzel Timothy M. Merlis 2019-07-01T00:00:00Z https://doi.org/10.1029/2018MS001544 https://doaj.org/article/b951ba5477b647ddb87ce2bae90e4e65 EN eng American Geophysical Union (AGU) https://doi.org/10.1029/2018MS001544 https://doaj.org/toc/1942-2466 1942-2466 doi:10.1029/2018MS001544 https://doaj.org/article/b951ba5477b647ddb87ce2bae90e4e65 Journal of Advances in Modeling Earth Systems, Vol 11, Iss 7, Pp 2163-2176 (2019) Physical geography GB3-5030 Oceanography GC1-1581 article 2019 ftdoajarticles https://doi.org/10.1029/2018MS001544 2022-12-31T01:41:49Z Abstract The ocean's response to direct atmospheric effects of increased carbon dioxide's (CO2) radiative forcing is examined. These direct effects are defined as the climate changes that result from forcing on a fast time scale of about a year, independent of the slower surface warming that the forcing also provokes. To evaluate how these direct effects impact ocean heat uptake and circulation, output of atmospheric general circulation model (GCM) simulations are used to force an ocean GCM with comprehensive boundary conditions. Perturbation simulations with the prescribed response to a quadrupling of atmospheric CO2 include altered surface winds, freshwater fluxes, downwelling shortwave radiation, and downwelling longwave cloud radiative effect. The perturbation simulations show that the intensification and poleward shift of surface winds, particularly in the Southern Ocean, strengthen the shallow overturning circulation in the tropical Pacific and deep overturning in the Atlantic. This, in turn, has a cooling effect on the global ocean at shallow depths. A two‐layer energy balance model, designed to capture transient global mean climate change, is adapted to account for the altered ocean heat uptake from direct effects. The direct change in global mean ocean heat uptake is a decrease of about 0.3 W/m2 for quadrupling of CO2, offsetting about 5% of the surface longwave forcing. Article in Journal/Newspaper Southern Ocean Directory of Open Access Journals: DOAJ Articles Southern Ocean Pacific Journal of Advances in Modeling Earth Systems 11 7 2163 2176 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Physical geography GB3-5030 Oceanography GC1-1581 |
spellingShingle |
Physical geography GB3-5030 Oceanography GC1-1581 Molly E. Menzel Timothy M. Merlis Connecting Direct Effects of CO2 Radiative Forcing to Ocean Heat Uptake and Circulation |
topic_facet |
Physical geography GB3-5030 Oceanography GC1-1581 |
description |
Abstract The ocean's response to direct atmospheric effects of increased carbon dioxide's (CO2) radiative forcing is examined. These direct effects are defined as the climate changes that result from forcing on a fast time scale of about a year, independent of the slower surface warming that the forcing also provokes. To evaluate how these direct effects impact ocean heat uptake and circulation, output of atmospheric general circulation model (GCM) simulations are used to force an ocean GCM with comprehensive boundary conditions. Perturbation simulations with the prescribed response to a quadrupling of atmospheric CO2 include altered surface winds, freshwater fluxes, downwelling shortwave radiation, and downwelling longwave cloud radiative effect. The perturbation simulations show that the intensification and poleward shift of surface winds, particularly in the Southern Ocean, strengthen the shallow overturning circulation in the tropical Pacific and deep overturning in the Atlantic. This, in turn, has a cooling effect on the global ocean at shallow depths. A two‐layer energy balance model, designed to capture transient global mean climate change, is adapted to account for the altered ocean heat uptake from direct effects. The direct change in global mean ocean heat uptake is a decrease of about 0.3 W/m2 for quadrupling of CO2, offsetting about 5% of the surface longwave forcing. |
format |
Article in Journal/Newspaper |
author |
Molly E. Menzel Timothy M. Merlis |
author_facet |
Molly E. Menzel Timothy M. Merlis |
author_sort |
Molly E. Menzel |
title |
Connecting Direct Effects of CO2 Radiative Forcing to Ocean Heat Uptake and Circulation |
title_short |
Connecting Direct Effects of CO2 Radiative Forcing to Ocean Heat Uptake and Circulation |
title_full |
Connecting Direct Effects of CO2 Radiative Forcing to Ocean Heat Uptake and Circulation |
title_fullStr |
Connecting Direct Effects of CO2 Radiative Forcing to Ocean Heat Uptake and Circulation |
title_full_unstemmed |
Connecting Direct Effects of CO2 Radiative Forcing to Ocean Heat Uptake and Circulation |
title_sort |
connecting direct effects of co2 radiative forcing to ocean heat uptake and circulation |
publisher |
American Geophysical Union (AGU) |
publishDate |
2019 |
url |
https://doi.org/10.1029/2018MS001544 https://doaj.org/article/b951ba5477b647ddb87ce2bae90e4e65 |
geographic |
Southern Ocean Pacific |
geographic_facet |
Southern Ocean Pacific |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Journal of Advances in Modeling Earth Systems, Vol 11, Iss 7, Pp 2163-2176 (2019) |
op_relation |
https://doi.org/10.1029/2018MS001544 https://doaj.org/toc/1942-2466 1942-2466 doi:10.1029/2018MS001544 https://doaj.org/article/b951ba5477b647ddb87ce2bae90e4e65 |
op_doi |
https://doi.org/10.1029/2018MS001544 |
container_title |
Journal of Advances in Modeling Earth Systems |
container_volume |
11 |
container_issue |
7 |
container_start_page |
2163 |
op_container_end_page |
2176 |
_version_ |
1766207120508715008 |