Estimating the storage of anthropogenic carbon in the subtropical Indian Ocean: a comparison of five different approaches
The subtropical Indian Ocean along 32 degrees S was for the first time simultaneously sampled in 2002 for inorganic carbon and transient tracers. The vertical distribution and inventory of anthropogenic carbon (CANT) from five different methods: four data-base methods (Delta C*, TrOCA, TTD and IPSL)...
Published in: | Biogeosciences |
---|---|
Main Authors: | , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Gesellschaft Mbh
2009
|
Subjects: | |
Online Access: | https://archimer.ifremer.fr/doc/00218/32916/31409.pdf https://archimer.ifremer.fr/doc/00218/32916/93136.pdf https://doi.org/10.5194/bg-6-681-2009 https://archimer.ifremer.fr/doc/00218/32916/ |
id |
ftarchimer:oai:archimer.ifremer.fr:32916 |
---|---|
record_format |
openpolar |
spelling |
ftarchimer:oai:archimer.ifremer.fr:32916 2023-05-15T13:47:37+02:00 Estimating the storage of anthropogenic carbon in the subtropical Indian Ocean: a comparison of five different approaches Alvarez, M. Lo Monaco, C. Tanhua, T. Yool, A. Oschlies, A. Bullister, J. L. Goyet, C. Metzl, N. Touratier, F. Mcdonagh, E. Bryden, H. L. 2009-04-27 application/pdf https://archimer.ifremer.fr/doc/00218/32916/31409.pdf https://archimer.ifremer.fr/doc/00218/32916/93136.pdf https://doi.org/10.5194/bg-6-681-2009 https://archimer.ifremer.fr/doc/00218/32916/ eng eng Copernicus Gesellschaft Mbh https://archimer.ifremer.fr/doc/00218/32916/31409.pdf https://archimer.ifremer.fr/doc/00218/32916/93136.pdf doi:10.5194/bg-6-681-2009 https://archimer.ifremer.fr/doc/00218/32916/ Author(s) 2009. This work is distributed under the Creative Commons Attribution 3.0 License. info:eu-repo/semantics/openAccess restricted use CC-BY Biogeosciences (1726-4170) (Copernicus Gesellschaft Mbh), 2009-04-27 , Vol. 6 , N. 4 , P. 681-703 text Publication info:eu-repo/semantics/article 2009 ftarchimer https://doi.org/10.5194/bg-6-681-2009 2022-04-12T22:50:01Z The subtropical Indian Ocean along 32 degrees S was for the first time simultaneously sampled in 2002 for inorganic carbon and transient tracers. The vertical distribution and inventory of anthropogenic carbon (CANT) from five different methods: four data-base methods (Delta C*, TrOCA, TTD and IPSL) and a simulation from the OCCAM model are compared and discussed along with the observed CFC-12 and CCl4 distributions. In the surface layer, where carbon-based methods are uncertain, TTD and OCCAM yield the same result (7 +/- 0.2 molC m(-2)), helping to specify the surface CANT inventory. Below the mixed-layer, the comparison suggests that CANT penetrates deeper and more uniformly into the Antarctic Intermediate Water layer limit than estimated from the much utilized Delta C* method. Significant CFC-12 and CCl4 values are detected in bottom waters, associated with Antarctic Bottom Water. In this layer, except for Delta C* and OCCAM, the other methods detect significant CANT values. Consequently, the lowest inventory is calculated using the Delta C* method (24 +/- 2 molC m(-2)) or OCCAM (24.4 +/- 2.8 molC m(-2)) while TrOCA, TTD, and IPSL lead to higher inventories (28.1 +/- 2.2, 28.9 +/- 2.3 and 30.8 +/- 2.5 molC m(-2) respectively). Overall and despite the uncertainties each method is evaluated using its relationship with tracers and the knowledge about water masses in the subtropical Indian Ocean. Along 32 degrees S our best estimate for the mean CANT specific inventory is 28 +/- 2 molC m(-2). Comparison exercises for data-based CANT methods along with time-series or repeat sections analysis should help to identify strengths and caveats in the CANT methods and to better constrain model simulations. Article in Journal/Newspaper Antarc* Antarctic Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Antarctic Indian The Antarctic Biogeosciences 6 4 681 703 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
The subtropical Indian Ocean along 32 degrees S was for the first time simultaneously sampled in 2002 for inorganic carbon and transient tracers. The vertical distribution and inventory of anthropogenic carbon (CANT) from five different methods: four data-base methods (Delta C*, TrOCA, TTD and IPSL) and a simulation from the OCCAM model are compared and discussed along with the observed CFC-12 and CCl4 distributions. In the surface layer, where carbon-based methods are uncertain, TTD and OCCAM yield the same result (7 +/- 0.2 molC m(-2)), helping to specify the surface CANT inventory. Below the mixed-layer, the comparison suggests that CANT penetrates deeper and more uniformly into the Antarctic Intermediate Water layer limit than estimated from the much utilized Delta C* method. Significant CFC-12 and CCl4 values are detected in bottom waters, associated with Antarctic Bottom Water. In this layer, except for Delta C* and OCCAM, the other methods detect significant CANT values. Consequently, the lowest inventory is calculated using the Delta C* method (24 +/- 2 molC m(-2)) or OCCAM (24.4 +/- 2.8 molC m(-2)) while TrOCA, TTD, and IPSL lead to higher inventories (28.1 +/- 2.2, 28.9 +/- 2.3 and 30.8 +/- 2.5 molC m(-2) respectively). Overall and despite the uncertainties each method is evaluated using its relationship with tracers and the knowledge about water masses in the subtropical Indian Ocean. Along 32 degrees S our best estimate for the mean CANT specific inventory is 28 +/- 2 molC m(-2). Comparison exercises for data-based CANT methods along with time-series or repeat sections analysis should help to identify strengths and caveats in the CANT methods and to better constrain model simulations. |
format |
Article in Journal/Newspaper |
author |
Alvarez, M. Lo Monaco, C. Tanhua, T. Yool, A. Oschlies, A. Bullister, J. L. Goyet, C. Metzl, N. Touratier, F. Mcdonagh, E. Bryden, H. L. |
spellingShingle |
Alvarez, M. Lo Monaco, C. Tanhua, T. Yool, A. Oschlies, A. Bullister, J. L. Goyet, C. Metzl, N. Touratier, F. Mcdonagh, E. Bryden, H. L. Estimating the storage of anthropogenic carbon in the subtropical Indian Ocean: a comparison of five different approaches |
author_facet |
Alvarez, M. Lo Monaco, C. Tanhua, T. Yool, A. Oschlies, A. Bullister, J. L. Goyet, C. Metzl, N. Touratier, F. Mcdonagh, E. Bryden, H. L. |
author_sort |
Alvarez, M. |
title |
Estimating the storage of anthropogenic carbon in the subtropical Indian Ocean: a comparison of five different approaches |
title_short |
Estimating the storage of anthropogenic carbon in the subtropical Indian Ocean: a comparison of five different approaches |
title_full |
Estimating the storage of anthropogenic carbon in the subtropical Indian Ocean: a comparison of five different approaches |
title_fullStr |
Estimating the storage of anthropogenic carbon in the subtropical Indian Ocean: a comparison of five different approaches |
title_full_unstemmed |
Estimating the storage of anthropogenic carbon in the subtropical Indian Ocean: a comparison of five different approaches |
title_sort |
estimating the storage of anthropogenic carbon in the subtropical indian ocean: a comparison of five different approaches |
publisher |
Copernicus Gesellschaft Mbh |
publishDate |
2009 |
url |
https://archimer.ifremer.fr/doc/00218/32916/31409.pdf https://archimer.ifremer.fr/doc/00218/32916/93136.pdf https://doi.org/10.5194/bg-6-681-2009 https://archimer.ifremer.fr/doc/00218/32916/ |
geographic |
Antarctic Indian The Antarctic |
geographic_facet |
Antarctic Indian The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Biogeosciences (1726-4170) (Copernicus Gesellschaft Mbh), 2009-04-27 , Vol. 6 , N. 4 , P. 681-703 |
op_relation |
https://archimer.ifremer.fr/doc/00218/32916/31409.pdf https://archimer.ifremer.fr/doc/00218/32916/93136.pdf doi:10.5194/bg-6-681-2009 https://archimer.ifremer.fr/doc/00218/32916/ |
op_rights |
Author(s) 2009. This work is distributed under the Creative Commons Attribution 3.0 License. info:eu-repo/semantics/openAccess restricted use |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/bg-6-681-2009 |
container_title |
Biogeosciences |
container_volume |
6 |
container_issue |
4 |
container_start_page |
681 |
op_container_end_page |
703 |
_version_ |
1766247532717932544 |