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Modulation of the particulate organic carbon flux to the ocean by a macrotidal estuary: Evidence from measurements of carbon isotopes in organic matter from the Gironde system
Institution:1. Centre des Faibles Radioactivitiés, Laboratoire mixte CEA-CNRS, Domaine du CNRS, BP1-91190 Gif sur Yvette, France;2. Institut Géologie du Bassin d''Aquitaine, Université Bordeaux I, 351 Cours de la Libération, 33405 Talence, France;1. Laboratory of Molecular Cell Biology, School of Pharmaceutical Sciences, Kobe Gakuin University, 1-1-3 Minatojima, Chuo-ku, Kobe 650-8586, Japan;2. Laboratory of Toxicology, Faculty of Pharmacy, Osaka Ohtani University, 3-11-1 Nishikigorikita, Tondabayashi, Osaka 584-8540, Japan;3. Department of Pharmaceutical Health Care, Faculty of Pharmaceutical Sciences, Himeji Dokkyo University, 7-2-1 Kamiohno, Himeji 670-8524 Japan;1. Toyohashi University of Technology, 1-1 Hibariga-oka, Tempaku, Toyohashi 441-8580, Japan;2. Doshisya University, 1-3 Miyakodani, Tatara, Kyotanabe 610-0394, Japan;3. National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Japan;4. Nagoya Industrial Science Research Institute, 1-13 Yotsuya-dori, Chikusa-ku, Nagoya 464-0819, Japan;1. Department of Mechanical Engineering, Bethlahem Institute of Engineering, Kanyakumari 629157, Tamil Nadu, India;2. Department of Mechanical Engineering, Government College of Engineering, Bodi 625 513, Tamil Nadu, India;3. Department of Civil Engineering, Government College of Engineering, Tirunelveli 627 007, Tamil Nadu, India;4. Department of Mechanical Engineering, A.C. College of Engineering and Technology, Karaikudi 630 004, Tamil Nadu, India
Abstract:The isotopic composition of the organic carbon of the suspended particulate matter in the Gironde estuary and the Biscay shelf has been measured on a seasonal basis from 1977 to 1982. The δ13C values show a progressive change along the estuary and permit an estimate of the proportion of terrestrial carbon in each sample. It is estimated from these data that up to 80% of the continental POC is mineralized in the estuary and 3–16% of the riverborne flux is exported to the shelf.
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