Partial pressure and air–sea CO2 flux in the Aegean Sea during February 2006 |
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| Authors: | Evangelia Krasakopoulou Spyridon Rapsomanikis Anastasios Papadopoulos Evangelos Papathanassiou |
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| Institution: | 1. Key Laboratory of Marine Environmental Science and Ecology, Ministry of Education, College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China;2. Center for Ocean and Climate Research, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;1. Dept. of Oceanography, Dalhousie University, Halifax, Canada;2. Oceanography Division, Naval Research Laboratory, Stennis Space Center, MS, USA;3. Lamont-Doherty Earth Observatory, Columbia University, NY, USA;1. NOAA Center for Satellite Applications and Research, United States;2. GST, Inc., United States;3. City College of New York, CREST, United States;4. Graduate Center of City University of New York, United States;1. Department of Aquatic Environment, Centre for Hydrographic Studies, CEDEX, Madrid, Spain;2. CREAF, Cerdanyola del Vallès, CEAB, CSIC, Blanes, Spain;3. Institute for Ecosystem Study, National Research Council, Verbania Pallanza, Italy;4. Water Development Department, Nicosia, Cyprus;5. Department of Water Resources, Portuguese Environment Agency, Lisbon, Portugal;6. Irstea, UR EABX, F-33612 Cestas Cedex, France;7. National Administration “Apele Române”, Department River Basin Management Plans, Bucure?ti, Romania;8. MER Lab Ltd, Parekklisia, Limassol, Cyprus |
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| Abstract: | Data on the distribution of fCO2 were obtained during a cruise in the Aegean Sea during February 2006. The fCO2 of surface water (fCO2sw) was lower than the atmospheric fCO2 (fCO2atm) throughout the area surveyed and ΔfCO2 values varied from ?34 to ?61 μatm. The observed under-saturation suggests that surface waters in the Aegean represent a sink for atmospheric CO2 during the winter of 2006. Higher fCO2sw values were recorded in the ‘less warm’ and ‘less saline’ shallow northernmost part of the Aegean Sea implying that the lower seawater temperature and salinity in this area play a crucial role in the spatial distribution of fCO2sw.A first estimate of the magnitude of the air–sea CO2 exchange and the potential role of the Aegean Sea in the transfer of atmospheric CO2 was also obtained. The air–sea CO2 fluxes calculated using different gas transfer formulations showed that during February 2006, the Aegean Sea absorbs atmospheric CO2 at a rate ranging from ?6.2 to ?11.8 mmol m?2 d?1 with the shipboard recorded wind speeds and at almost half rate (?3.5 to ?5.5 mmol m?2 d?1) with the monthly mean model-derived wind speed. Compared to recent observations from other temperate continental shelves during winter period, the Aegean Sea acts as a moderate to rather strong sink for atmospheric CO2.Further investigations, including intensive spatial and temporal high-resolution observations, are necessary to elucidate the role of the Aegean Sea in the process of transfer of atmospheric CO2 into the deep horizons of the Eastern Mediterranean. |
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