Amazon Atlantic outflow region carbon cycling constrained by atmospheric greenhouse gas data
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2017
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INTERNATIONAL CARBON DIOXIDE CONFERENCE, 10th
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Estuaries and near-coastal regions may process substantial amounts of carbon causing a nonnegligible
carbon uptake from the atmosphere. For purpose of characterizing the greenhouse gas
levels of air entering the Amazon basin from the Atlantic we have been measuring regularly
greenhouse gas concentrations at several sites along the North-East Atlantic coast of Brazil over
approximately the past six years (at some of the sites for much longer). At some of the sites sampling
is restricted close to the surface while at other sites we have been measuring vertical profiles. At
Salinopolis which is located close to the Amazon outflow region to the Atlantic seasonally strong CO2
depletion in both surface records and aircraft vertical profiles compared to background sites like
Ascension Island is clearly discernible. The seasonality is synchronous with increases in chlorophyll
observed from space e.g. by the SeaWiFS mission. Incidentally during the CO2 depletion period airmass
trajectories tend to pass over the shelf region along the Brazilian coast travelling from the South
along the coast. This enables us to apply an air column mass balance approach to estimate the
magnitude of the CO2 flux into the sea along the coast during the blooms. Using the chlorophyll maps
we may furthermore extrapolate the flux estimates spatially to obtain an area integrated flux. We will
discuss our findings and put our flux estimates into perspective with estimates for productivity and
carbon uptake in coastal regions of major tropical rivers as well as the extra-tropics.
Acknowledgment: CNPq, NERC, FAPESP, MCTI, NOAA, IPEN and INPE.
Como referenciar
BORGES, VIVIANE F.; GATTI, LUCIANA V.; GLOOR, EMANUEL U.; MILLER, JOHN B.; BOESCH, HARTMUT; DOMINGUES, LUCAS G.; CORREIA, CAIO S. de C.; BASSO, LUANA S.; SANTOS, RICARDO S. Amazon Atlantic outflow region carbon cycling constrained by atmospheric greenhouse gas data. In: INTERNATIONAL CARBON DIOXIDE CONFERENCE, 10th, August 21-25, 2017, Interlaken, Switzerland. Abstract... Bern, Switzerland: Swiss Academy of Sciences (SCNAT), 2017. p. 137-137. Disponível em: http://repositorio.ipen.br/handle/123456789/29148. Acesso em: 12 May 2024.
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