Carbon dioxide in surface seawaters of the Seto Inland Sea,Japan |
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| Authors: | Eiji Ohtaki Eiji Yamashita Fukuichi Fujiwara |
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| Institution: | (1) College of Liberal Arts and Sciences, Okayama University, 700 Okayama, Japan;(2) Environmental Resources Research Center, Okayama University of Science, 700 Okayama, Japan;(3) Department of Public Health, City of Okayama, 700 Okayama, Japan |
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| Abstract: | Observations were made of time variations of carbon dioxide in seawater, pCO2, and in the atmosphere, PCO2, in the Seto Inland Sea of Japan. The pCO2 data showed well defined diurnal variation; high values at nighttime and low values during daylight hours. The pCO2 correlated negatively with dissolved oxygen. These results denote that the diurnal variation of pCO2 is associated with effects of photoplankton's activity in seawater. The pCO2 measured in the Seto Inland Sea showed higher values than the PCO2 during June to November, denoting transport of carbon dioxide from the sea surface to the atmosphere, and lower values during December to May, denoting transport of carbon dioxide from the atmosphere to the sea surface. The exchange rates of carbon dioxide were calculated using working formula given by Andriéet al. (1986). The results showed that the Seto Inland Sea gained carbon dioxide of 1.0 m-mol m–2 d–1 from the atmosphere in March and lost 1.7 m-mol m–2 d–1 to the atmosphere in August. |
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