Representation of the carbon cycle in box models and GCMs 2. Organic pump
[1] Box models of the ocean/atmosphere CO2 system rely on mechanisms at polar outcrops to alter the strength of the ocean’s organic carbon pump. GCM-based carbon system models are reportedly less sensitive to the same processes. Here we separate the carbon pumps in a three-box model and the GCM-base...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.143.7480 2023-05-15T17:34:37+02:00 Representation of the carbon cycle in box models and GCMs 2. Organic pump J. R. Toggweiler R. Murnane S. Carson A. Gnanadesikan J. L. Sarmiento The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.143.7480 http://www.gfdl.noaa.gov/reference/bibliography/2003/jrt0301.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.143.7480 http://www.gfdl.noaa.gov/reference/bibliography/2003/jrt0301.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.gfdl.noaa.gov/reference/bibliography/2003/jrt0301.pdf ocean carbon cycle organic pump box model gas exchange preformed nutrients glacialinterglacial CO2 text ftciteseerx 2016-01-07T15:03:15Z [1] Box models of the ocean/atmosphere CO2 system rely on mechanisms at polar outcrops to alter the strength of the ocean’s organic carbon pump. GCM-based carbon system models are reportedly less sensitive to the same processes. Here we separate the carbon pumps in a three-box model and the GCM-based Princeton Ocean Biogeochemistry Model to show how the organic pumps operate in the two kinds of models. The organic pumps are found to be quite different in two respects. Deep water in the three-box model is relatively well equilibrated with respect to the pCO2 of the atmosphere while deep water in the GCM tends to be poorly equilibrated. This makes the organic pump inherently stronger in the GCM than in the three-box model. The second difference has to do with the role of polar nutrient utilization. The organic pump in the GCM is shown to have natural upper and lower limits that are set by the initial PO4 concentrations in the deep water formed in the North Atlantic and Southern Ocean. The strength of the organic pump can swing between these limits in response to changes in deep-water formation that alter the mix of northern and southern deep water. Thus, unlike the situation in the three-box model, the organic pump in the GCM can become weaker or stronger Text North Atlantic Southern Ocean Unknown Southern Ocean |
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Open Polar |
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ftciteseerx |
language |
English |
topic |
ocean carbon cycle organic pump box model gas exchange preformed nutrients glacialinterglacial CO2 |
spellingShingle |
ocean carbon cycle organic pump box model gas exchange preformed nutrients glacialinterglacial CO2 J. R. Toggweiler R. Murnane S. Carson A. Gnanadesikan J. L. Sarmiento Representation of the carbon cycle in box models and GCMs 2. Organic pump |
topic_facet |
ocean carbon cycle organic pump box model gas exchange preformed nutrients glacialinterglacial CO2 |
description |
[1] Box models of the ocean/atmosphere CO2 system rely on mechanisms at polar outcrops to alter the strength of the ocean’s organic carbon pump. GCM-based carbon system models are reportedly less sensitive to the same processes. Here we separate the carbon pumps in a three-box model and the GCM-based Princeton Ocean Biogeochemistry Model to show how the organic pumps operate in the two kinds of models. The organic pumps are found to be quite different in two respects. Deep water in the three-box model is relatively well equilibrated with respect to the pCO2 of the atmosphere while deep water in the GCM tends to be poorly equilibrated. This makes the organic pump inherently stronger in the GCM than in the three-box model. The second difference has to do with the role of polar nutrient utilization. The organic pump in the GCM is shown to have natural upper and lower limits that are set by the initial PO4 concentrations in the deep water formed in the North Atlantic and Southern Ocean. The strength of the organic pump can swing between these limits in response to changes in deep-water formation that alter the mix of northern and southern deep water. Thus, unlike the situation in the three-box model, the organic pump in the GCM can become weaker or stronger |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
J. R. Toggweiler R. Murnane S. Carson A. Gnanadesikan J. L. Sarmiento |
author_facet |
J. R. Toggweiler R. Murnane S. Carson A. Gnanadesikan J. L. Sarmiento |
author_sort |
J. R. Toggweiler |
title |
Representation of the carbon cycle in box models and GCMs 2. Organic pump |
title_short |
Representation of the carbon cycle in box models and GCMs 2. Organic pump |
title_full |
Representation of the carbon cycle in box models and GCMs 2. Organic pump |
title_fullStr |
Representation of the carbon cycle in box models and GCMs 2. Organic pump |
title_full_unstemmed |
Representation of the carbon cycle in box models and GCMs 2. Organic pump |
title_sort |
representation of the carbon cycle in box models and gcms 2. organic pump |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.143.7480 http://www.gfdl.noaa.gov/reference/bibliography/2003/jrt0301.pdf |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
North Atlantic Southern Ocean |
genre_facet |
North Atlantic Southern Ocean |
op_source |
http://www.gfdl.noaa.gov/reference/bibliography/2003/jrt0301.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.143.7480 http://www.gfdl.noaa.gov/reference/bibliography/2003/jrt0301.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766133504136970240 |