Estimating the storage of anthropogenic carbon in the subtropical Indian Ocean: a comparison of five different approaches
The subtropical Indian Ocean along 32° 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 (ΔC*, TrOCA, TTD and IPSL) and a simul...
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ftnerc:oai:nora.nerc.ac.uk:171936 2023-05-15T13:48:07+02:00 Estimating the storage of anthropogenic carbon in the subtropical Indian Ocean: a comparison of five different approaches Álvarez, 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 http://nora.nerc.ac.uk/id/eprint/171936/ http://www.biogeosciences.net/6/681/2009/bg-6-681-2009.html unknown Álvarez, M.; Lo Monaco, C.; Tanhua, T.; Yool, A. orcid:0000-0002-9879-2776 Oschlies, A.; Bullister, J.L.; Goyet, C.; Metzl, N.; Touratier, F.; McDonagh, E.; Bryden, H.L. 2009 Estimating the storage of anthropogenic carbon in the subtropical Indian Ocean: a comparison of five different approaches. Biogeosciences, 6 (4). 681-703. https://doi.org/10.5194/bg-6-681-2009 <https://doi.org/10.5194/bg-6-681-2009> Publication - Article PeerReviewed 2009 ftnerc https://doi.org/10.5194/bg-6-681-2009 2023-02-04T19:35:33Z The subtropical Indian Ocean along 32° 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 (ΔC*, 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 ΔC* method. Significant CFC-12 and CCl4 values are detected in bottom waters, associated with Antarctic Bottom Water. In this layer, except for ΔC* and OCCAM, the other methods detect significant CANT values. Consequently, the lowest inventory is calculated using the ΔC* 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° 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 Natural Environment Research Council: NERC Open Research Archive Antarctic Indian The Antarctic Biogeosciences 6 4 681 703 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
description |
The subtropical Indian Ocean along 32° 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 (ΔC*, 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 ΔC* method. Significant CFC-12 and CCl4 values are detected in bottom waters, associated with Antarctic Bottom Water. In this layer, except for ΔC* and OCCAM, the other methods detect significant CANT values. Consequently, the lowest inventory is calculated using the ΔC* 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° 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 |
Álvarez, 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 |
Álvarez, 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 |
Álvarez, 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 |
Álvarez, 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 |
publishDate |
2009 |
url |
http://nora.nerc.ac.uk/id/eprint/171936/ http://www.biogeosciences.net/6/681/2009/bg-6-681-2009.html |
geographic |
Antarctic Indian The Antarctic |
geographic_facet |
Antarctic Indian The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
Álvarez, M.; Lo Monaco, C.; Tanhua, T.; Yool, A. orcid:0000-0002-9879-2776 Oschlies, A.; Bullister, J.L.; Goyet, C.; Metzl, N.; Touratier, F.; McDonagh, E.; Bryden, H.L. 2009 Estimating the storage of anthropogenic carbon in the subtropical Indian Ocean: a comparison of five different approaches. Biogeosciences, 6 (4). 681-703. https://doi.org/10.5194/bg-6-681-2009 <https://doi.org/10.5194/bg-6-681-2009> |
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 |
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1766248622297448448 |