The Effect of Diapycnal Mixing on the Ventilation and CFC-11 Uptake in the Southern Ocean
The Miami Isopycnic Coordinate Ocean Model (MICOM) is used to investigate the effect of diapycnal mixing on the oceanic uptake of CFC-11 and the ventilation of the surface waters in the Southern Ocean (south of 45◦S). Three model experiments are performed: one with a diapycnal mixing coefficient Kd...
Main Authors: | , |
---|---|
Other Authors: | |
Format: | Text |
Language: | English |
Published: |
2003
|
Subjects: | |
Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.493.9018 http://www-2.nersc.no/~yong/gao_aas_2004.pdf |
id |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.493.9018 |
---|---|
record_format |
openpolar |
spelling |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.493.9018 2023-05-15T18:24:21+02:00 The Effect of Diapycnal Mixing on the Ventilation and CFC-11 Uptake in the Southern Ocean Yongqi Gao Helge Drange The Pennsylvania State University CiteSeerX Archives 2003 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.493.9018 http://www-2.nersc.no/~yong/gao_aas_2004.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.493.9018 http://www-2.nersc.no/~yong/gao_aas_2004.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www-2.nersc.no/~yong/gao_aas_2004.pdf Key words chlorofluorocarbons CFC-11 diapycnal mixing ocean modelling ocean ventilation South text 2003 ftciteseerx 2016-01-08T08:40:14Z The Miami Isopycnic Coordinate Ocean Model (MICOM) is used to investigate the effect of diapycnal mixing on the oceanic uptake of CFC-11 and the ventilation of the surface waters in the Southern Ocean (south of 45◦S). Three model experiments are performed: one with a diapycnal mixing coefficient Kd (m 2 s−1) of 2 × 10−7/N (Expt. 1), one with Kd = 0 (Expt. 2), and one with Kd = 5 × 10−8/N (Expt. 3), N (s−1) is the Brunt-Väisäla ̈ frequency. The model simulations indicate that the observed vertical distribution of CFC-11 along 88◦W (prime meridian at 0◦E) in the Southern Ocean is caused by local ventilation of the surface waters and westward-directed (eastward-directed) isopycnic transport and mixing from deeply ventilated waters in the Weddell Sea region. It is found that at the end of 1997, the simulated net ocean uptake of CFC-11 in Expt. 2 is 25 % below that of Expt. 1. The decreased uptake of CFC-11 in the Southern Ocean accounts for 80 % of this difference. Furthermore, Expts. 2 and 3 yield far more realistic vertical distributions of the ventilated CFC-waters than Expt. 1. The experiments clearly highlight the sensitivity of the Southern Ocean surface water ventilation to the distribution and thickness of the simulated mixed layer. It is argued that inclusion of CFCs in coupled climate models could be used as a test-bed for evaluating the decadal-scale ocean uptake of heat and CO2. Text Southern Ocean Weddell Sea Unknown Southern Ocean Weddell Weddell Sea |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftciteseerx |
language |
English |
topic |
Key words chlorofluorocarbons CFC-11 diapycnal mixing ocean modelling ocean ventilation South |
spellingShingle |
Key words chlorofluorocarbons CFC-11 diapycnal mixing ocean modelling ocean ventilation South Yongqi Gao Helge Drange The Effect of Diapycnal Mixing on the Ventilation and CFC-11 Uptake in the Southern Ocean |
topic_facet |
Key words chlorofluorocarbons CFC-11 diapycnal mixing ocean modelling ocean ventilation South |
description |
The Miami Isopycnic Coordinate Ocean Model (MICOM) is used to investigate the effect of diapycnal mixing on the oceanic uptake of CFC-11 and the ventilation of the surface waters in the Southern Ocean (south of 45◦S). Three model experiments are performed: one with a diapycnal mixing coefficient Kd (m 2 s−1) of 2 × 10−7/N (Expt. 1), one with Kd = 0 (Expt. 2), and one with Kd = 5 × 10−8/N (Expt. 3), N (s−1) is the Brunt-Väisäla ̈ frequency. The model simulations indicate that the observed vertical distribution of CFC-11 along 88◦W (prime meridian at 0◦E) in the Southern Ocean is caused by local ventilation of the surface waters and westward-directed (eastward-directed) isopycnic transport and mixing from deeply ventilated waters in the Weddell Sea region. It is found that at the end of 1997, the simulated net ocean uptake of CFC-11 in Expt. 2 is 25 % below that of Expt. 1. The decreased uptake of CFC-11 in the Southern Ocean accounts for 80 % of this difference. Furthermore, Expts. 2 and 3 yield far more realistic vertical distributions of the ventilated CFC-waters than Expt. 1. The experiments clearly highlight the sensitivity of the Southern Ocean surface water ventilation to the distribution and thickness of the simulated mixed layer. It is argued that inclusion of CFCs in coupled climate models could be used as a test-bed for evaluating the decadal-scale ocean uptake of heat and CO2. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Yongqi Gao Helge Drange |
author_facet |
Yongqi Gao Helge Drange |
author_sort |
Yongqi Gao |
title |
The Effect of Diapycnal Mixing on the Ventilation and CFC-11 Uptake in the Southern Ocean |
title_short |
The Effect of Diapycnal Mixing on the Ventilation and CFC-11 Uptake in the Southern Ocean |
title_full |
The Effect of Diapycnal Mixing on the Ventilation and CFC-11 Uptake in the Southern Ocean |
title_fullStr |
The Effect of Diapycnal Mixing on the Ventilation and CFC-11 Uptake in the Southern Ocean |
title_full_unstemmed |
The Effect of Diapycnal Mixing on the Ventilation and CFC-11 Uptake in the Southern Ocean |
title_sort |
effect of diapycnal mixing on the ventilation and cfc-11 uptake in the southern ocean |
publishDate |
2003 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.493.9018 http://www-2.nersc.no/~yong/gao_aas_2004.pdf |
geographic |
Southern Ocean Weddell Weddell Sea |
geographic_facet |
Southern Ocean Weddell Weddell Sea |
genre |
Southern Ocean Weddell Sea |
genre_facet |
Southern Ocean Weddell Sea |
op_source |
http://www-2.nersc.no/~yong/gao_aas_2004.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.493.9018 http://www-2.nersc.no/~yong/gao_aas_2004.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766204794899267584 |