The carbonate system in the East China Sea in winter |
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| Authors: | Wen-Chen Chou Gwo-Ching Gong Chun-Mao Tseng David D Sheu Chin-Chang Hung Lo-Ping Chang Li-Wen Wang |
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| Institution: | 1. Institute of Marine Environmental Chemistry and Ecology, National Taiwan Ocean University, Keelung 202, Taiwan, ROC;2. Institute of Oceanography, National Taiwan University, Taipei 106, Taiwan, ROC;3. Institute of Marine Geology and Chemistry, National Sun Yat-Sen University, Kaohsiung 804, Taiwan, ROC;4. Institute of Hydrological and Oceanic Sciences, National Central University, Taoyuan County 320, Taiwan, ROC;1. Pan-Okhotsk Research Center, Institute of Low Temperature Science, Hokkaido University, Sapporo 060-0819, Japan;2. Arctic Research Center, Hokkaido University, Sapporo 001-0021, Japan;3. Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa-shi, Chiba 277-8564, Japan;4. Faculty of Fisheries Sciences, Hokkaido University, Hakodate 041-8611, Japan;5. Graduate School of Fisheries and Environmental Sciences, Nagasaki University, Nagasaki 852-8521, Japan;6. Far Eastern Regional Hydrometeorological Research Institute, Vladivostok 690990, Russia;1. Institute of Marine Environment and Ecology, National Taiwan Ocean University, Keelung 202-24, Taiwan, ROC;2. Center of Excellence for the Oceans, National Taiwan Ocean University, Keelung 202-24, Taiwan, ROC |
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| Abstract: | Measurements of dissolved inorganic carbon (DIC), pH, total alkalinity (TA), and partial pressure of CO2 (pCO2) were conducted at a total of 25 stations along four cross shelf transects in the East China Sea (ECS) in January 2008. Results showed that their distributions in the surface water corresponded well to the general circulation pattern in the ECS. Low DIC and pCO2 and high pH were found in the warm and saline Kuroshio Current water flowing northeastward along the shelf break, whereas high DIC and pCO2 and low pH were mainly observed in the cold and less saline China Coastal Current water flowing southward along the coast of Mainland China. Difference between surface water and atmospheric pCO2 (ΔpCO2), ranging from ~ 0 to ? 111 μatm, indicated that the entire ECS shelf acted as a CO2 sink during winter with an average flux of CO2 of ?13.7 ± 5.7 (mmol C m? 2 day? 1), and is consistent with previous studies. However, pCO2 was negatively correlated with temperature for surface waters lower than 20 °C, in contrast to the positive correlation found in the 1990s. Moreover, the wintertime ΔpCO2 in the inner shelf near the Changjiang River estuary has appreciably decreased since the early 1990s, suggesting a decline of CO2 sequestration capacity in this region. However, the actual causes for the observed relationship between these decadal changes and the increased eutrophication over recent decades are worth further study. |
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