Data/hora: 01/06/2024 18:13:53

Provedor de dados: | 5
País: | France
Título: | Estimating the storage of anthropogenic carbon in the subtropical Indian Ocean: a comparison of five different approaches
Autores: | 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.
Data: | 2009-01-13
Ano: | 2009
Resumo: | 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 C0IPSL 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 mol C 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 ΔC* method. Additionally, 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 mol C m−2) or OCCAM (24.4±2.8 mol C m−2) while TrOCA, TTD, and C0IPSL lead to higher inventories (28.1±2.2, 28.9±2.3 and 30.8±2.5 mol C 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 mol C 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.
Tipo: | Text
Idioma: | Inglês

Identificador:

https://archimer.ifremer.fr/doc/00293/40431/38985.pdf

DOI:10.5194/bgd-6-729-2009

https://archimer.ifremer.fr/doc/00293/40431/

Editor: | Copernicus GmbH
Formato: | application/pdf
Fonte: | Biogeosciences Discussions (1810-6277) (Copernicus GmbH), 2009-01-13 , Vol. 6 , N. 1 , P. 729-796

Fonte:

Author(s) 2009. This work is distributed under the Creative Commons Attribution 3.0 License.

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