Dissolved and particulate organic carbon in the North Equatorial current of the Atlantic Ocean |
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| Affiliation: | 1. Departamento de Geologia e Geofísica, Universidade Federal Fluminense, Niterói, Brazil;2. MARUM ‐ Center for Marine Environmental Sciences, University of Bremen, Bremen, Germany;3. Programa de Geociências (Geoquímica), Universidade Federal Fluminense, Niterói, Brazil;4. School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, Brazil;5. UMR 6538 Geo-Ocean, CNRS, IFREMER, UBO, UBS, Centre de Bretagne 29280 Plouzané, France;6. Institute of Geosciences, University of São Paulo, São Paulo, Brazil;7. Institute of Geosciences, University of Campinas, Campinas, Brazil;8. Laboratoire des Sciences Du Climat et de L’Environnement/Institut Pierre Simon Laplace, CEA-CNRS-UVSQ, Université Paris Saclay, Gif sur Yvette, France;1. College of Marine Science, University of South Florida, St. Petersburg, FL 33705, United States;2. Marine Science Institute, University of California, Santa Barbara, CA 93106, United States;3. Earth, Ocean, Atmospheric Science, Florida State University, Tallahassee, FL 32306, United States |
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| Abstract: | As part of a study of biological systems in the Atlantic North Equatorial Current measurements were made of carbon dioxide and dissolved and particulate organic carbon along a section off the African coast chiefly following the parallel of 20°N. Particulate organic carbon (POC) in the mixed layer showed a decrease from east to west from an average of 100 μg·1−1 to 35 μg·1−1 and a difference between day and night from 70 to 20 μg·1−1. From this difference a minimum primary production of 450 to 1000 g C·m−2·a−1 was calculated. These production values are much higher than earlier data obtained by 14C measurements, but they support observations made by Gieskes, Kraay & Baars (1979) and Tijssen (1979) during the same programme but with different methods.All three components measured show distinct vertical gradients. On the basic of the CO2 gradient an average downward loss of organic metter through a reference level of 200 m was calculated of about 60 g·m−2·a−1. For dissolved organic matter (DOC) a downward transport of 8 g·m−2·a−1 was derived from the vertical gradient. |
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