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...
Published in: | Biogeosciences |
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Copernicus Publications (EGU)
2009
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Online Access: | https://oceanrep.geomar.de/id/eprint/3415/ https://oceanrep.geomar.de/id/eprint/3415/1/614_Alvar%C3%A9z_2009_EstimatingTheStorageOfAnthropogenic_Artzeit_pubid11271.pdf http://www.biogeosciences.net/6/681/2009/ https://doi.org/10.5194/bg-6-681-2009 |
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ftoceanrep:oai:oceanrep.geomar.de:3415 2024-09-15T17:42:08+00:00 Estimating the storage of anthropogenic carbon in the subtropical Indian Ocean: A comparison of five different approaches Alvaréz, M. Lo Monaco, C. Tanhua, Toste Yool, A. Oschlies, Andreas Bullister, J.L. Goyet, C. Tourtair, F. McDonagh, E. Bryden, H.L. 2009 text https://oceanrep.geomar.de/id/eprint/3415/ https://oceanrep.geomar.de/id/eprint/3415/1/614_Alvar%C3%A9z_2009_EstimatingTheStorageOfAnthropogenic_Artzeit_pubid11271.pdf http://www.biogeosciences.net/6/681/2009/ https://doi.org/10.5194/bg-6-681-2009 en eng Copernicus Publications (EGU) https://oceanrep.geomar.de/id/eprint/3415/1/614_Alvar%C3%A9z_2009_EstimatingTheStorageOfAnthropogenic_Artzeit_pubid11271.pdf Alvaréz, M., Lo Monaco, C., Tanhua, T. , Yool, A., Oschlies, A. , Bullister, J. L., Goyet, C., Tourtair, F., McDonagh, E. and Bryden, H. L. (2009) Estimating the storage of anthropogenic carbon in the subtropical Indian Ocean: A comparison of five different approaches. Open Access Biogeosciences (BG), 6 . pp. 681-703. DOI 10.5194/bg-6-681-2009 <https://doi.org/10.5194/bg-6-681-2009>. doi:10.5194/bg-6-681-2009 info:eu-repo/semantics/openAccess Article PeerReviewed 2009 ftoceanrep https://doi.org/10.5194/bg-6-681-2009 2024-09-04T05:04:40Z 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 OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Biogeosciences 6 4 681 703 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
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 |
Alvaréz, M. Lo Monaco, C. Tanhua, Toste Yool, A. Oschlies, Andreas Bullister, J.L. Goyet, C. Tourtair, F. McDonagh, E. Bryden, H.L. |
spellingShingle |
Alvaréz, M. Lo Monaco, C. Tanhua, Toste Yool, A. Oschlies, Andreas Bullister, J.L. Goyet, C. Tourtair, 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 |
Alvaréz, M. Lo Monaco, C. Tanhua, Toste Yool, A. Oschlies, Andreas Bullister, J.L. Goyet, C. Tourtair, F. McDonagh, E. Bryden, H.L. |
author_sort |
Alvaréz, 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 Publications (EGU) |
publishDate |
2009 |
url |
https://oceanrep.geomar.de/id/eprint/3415/ https://oceanrep.geomar.de/id/eprint/3415/1/614_Alvar%C3%A9z_2009_EstimatingTheStorageOfAnthropogenic_Artzeit_pubid11271.pdf http://www.biogeosciences.net/6/681/2009/ https://doi.org/10.5194/bg-6-681-2009 |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
https://oceanrep.geomar.de/id/eprint/3415/1/614_Alvar%C3%A9z_2009_EstimatingTheStorageOfAnthropogenic_Artzeit_pubid11271.pdf Alvaréz, M., Lo Monaco, C., Tanhua, T. , Yool, A., Oschlies, A. , Bullister, J. L., Goyet, C., Tourtair, F., McDonagh, E. and Bryden, H. L. (2009) Estimating the storage of anthropogenic carbon in the subtropical Indian Ocean: A comparison of five different approaches. Open Access Biogeosciences (BG), 6 . pp. 681-703. DOI 10.5194/bg-6-681-2009 <https://doi.org/10.5194/bg-6-681-2009>. doi:10.5194/bg-6-681-2009 |
op_rights |
info:eu-repo/semantics/openAccess |
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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1810488564363821056 |