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| Lo Monaco, C; Metzl, N; Poisson, A; Brunet, C; Schauer, B. |
| The Southern Ocean, where various water masses are formed ( mode, intermediate, deep, and bottom waters), has a high potential to absorb anthropogenic CO(2) ( C ant). However, most data-based and model estimates indicate low C(ant) inventories south of 50 degrees S. In order to investigate this paradox, the distribution of C(ant) is estimated between South Africa and Antarctica ( World Ocean Circulation Experiment ( WOCE) line I6) based on a back-calculation technique previously used in the North Atlantic ( Kortzinger et al., 1998) and adapted here for application in the Southern Ocean. At midlatitudes (30 degrees-50 degrees S), formation and spreading of mode and intermediate waters results in a deep penetration of C(ant) ( down to 2000 m). South of 50... |
| Tipo: Text |
Palavras-chave: Anthropogenic CO2; Southern Ocean; WOCE. |
| Ano: 2005 |
URL: https://archimer.ifremer.fr/doc/00233/34409/32823.pdf |
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| Hauck, Judith; Zeising, Moritz; Le Quere, Corinne; Gruber, Nicolas; Bakker, Dorothee C. E.; Bopp, Laurent; Chau, Thi Tuyet Trang; Guerses, Oezguer; Ilyina, Tatiana; Landschuetzer, Peter; Lenton, Andrew; Resplandy, Laure; Roedenbeck, Christian; Schwinger, Joerg; Seferian, Roland. |
| Based on the 2019 assessment of the Global Carbon Project, the ocean took up on average, 2.5 +/- 0.6 PgC yr(-1) or 23 +/- 5% of the total anthropogenic CO2 emissions over the decade 2009-2018. This sink estimate is based on simulation results from global ocean biogeochemicalmodels (GOBMs) and is compared to data-products based on observations of surface ocean pCO(2) (partial pressure of CO2) accounting for the outgassing of river-derived CO2. Here we evaluate the GOBM simulations by comparing the simulated surface ocean pCO(2) to observations. Based on this comparison, the simulations are well-suited for quantifying the global ocean carbon sink on the time-scale of the annual mean and its multi-decadal trend (RMSE <20 mu atm), as well as on the... |
| Tipo: Text |
Palavras-chave: Ocean carbon uptake; Anthropogenic CO2; Ocean carbon cycle model evaluation; Riverine carbon flux; Variability of the ocean carbon sink; Seasonal cycle. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00676/78822/81139.pdf |
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| Sulpis, Olivier; Boudreau, Bernard P.; Mucci, Alfonso; Jenkins, Chris; Trossman, David S.; Arbic, Brian K.; Key, Robert M.. |
| Oceanic uptake of anthropogenic CO2 leads to decreased pH, carbonate ion concentration, and saturation state with respect to CaCO3 minerals, causing increased dissolution of these minerals at the deep seafloor. This additional dissolution will figure prominently in the neutralization of man-made CO2 . However, there has been no concerted assessment of the current extent of anthropogenic CaCO3 dissolution at the deep seafloor. Here, recent databases of bottom-water chemistry, benthic currents, and CaCO3 content of deep-sea sediments are combined with a rate model to derive the global distribution of benthic calcite dissolution rates and obtain primary confirmation of an anthropogenic component. By comparing preindustrial with present-day rates, we determine... |
| Tipo: Text |
Palavras-chave: Ocean acidification; Seafloor; CaCO3; Dissolution; Anthropogenic CO2. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00675/78677/80887.pdf |
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| Gruber, Nicolas; Gloor, Manuel; Fletcher Mikaloff, Sara E.; Doney, Scott C.; Dutkiewicz, Stephanie; Follows, Michael J.; Gerber, Markus; Jacobson, Andrew R.; Joos, Fortunat; Lindsay, Keith; Menemenlis, Dimitris; Mouchet, Anne; Mueller, Simon A.; Sarmiento, Jorge L.; Takahashi, Taro. |
| We synthesize estimates of the contemporary net air-sea CO2 flux on the basis of an inversion of interior ocean carbon observations using a suite of 10 ocean general circulation models (Mikaloff Fletcher et al., 2006, 2007) and compare them to estimates based on a new climatology of the air-sea difference of the partial pressure of CO2 (pCO(2)) (Takahashi et al., 2008). These two independent flux estimates reveal a consistent description of the regional distribution of annual mean sources and sinks of atmospheric CO2 for the decade of the 1990s and the early 2000s with differences at the regional level of generally less than 0.1 Pg C a(-1). This distribution is characterized by outgassing in the tropics, uptake in midlatitudes, and comparatively small... |
| Tipo: Text |
Palavras-chave: Air-sea carbon flux; Carbon flux; Anthropogenic CO2. |
| Ano: 2009 |
URL: https://archimer.ifremer.fr/doc/00253/36415/34953.pdf |
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| Fajar, N. M.; Pardo, P. C.; Carracedo, Lidia; Vazquez-rodriguez, M.; Rios, A. F.; Perez, Ff. |
| The carbon system in the water masses of the Iberian Basin (North Atlantic Ocean) has been affected over the last two decades by the increase in anthropogenic CO2 (C-ant). In order to study the storage of C-ant in the Iberian Basin, variables of the carbonic system (i.e., pH, total inorganic carbon, and total alkalinity), among others, were measured during the CAIBOX cruise conducted between July and August 2009 within the framework of the CAIBEX project (Shelf-Ocean Exchanges in the Canary-Iberian Large Marine Ecosystem). The storage of C-ant was estimated using two different back-calculation techniques (i.e., the phi C degrees(T) and TrOCA methods) and for six layers of the water column corresponding to the approximate locations of the characteristic... |
| Tipo: Text |
Palavras-chave: Anthropogenic CO2; Back-calculation. |
| Ano: 2012 |
URL: https://archimer.ifremer.fr/doc/00629/74112/73546.pdf |
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