2011년 11월 고성만 굴(Crassostrea gigas) 양식장 수질환경 모니터링을 통한 이산화탄소 수지 평가
Evaluation of Simple CO2 budget with Environmental Monitoring at an Oyster Crassostrea gigas Farm in Goseong Bay, South Coast of Korea in November 2011
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Abstract: Real-time monitoring for environmental factors (temperature, salinity, chlorophylla , etc.) and fugacity of carbon dioxide ( f CO2) was conducted at an oyster Crassostrea gigas farm in Goseong Bay, south coast of Korea during 2-4th of November, 2011. Surface temperature and salinity were ranged from 17.9-18.7℃ and 32.7-33.8, respectively, with daily and inter-daily variations due to tidal currents. Surface f CO2 showed a range of 390-510 μatm and was higher than air CO2 during the study period. Surface temperature, salinity and f CO2 are showed significant correlations with chl.a and nutrients, respectively. It means when chl.-a value is high in surface water of the oyster farm, active biological production consume CO2 and nutrients from environments and produce oxygen, suggesting a tight feedback between biological processes and environmental reaction. Thus, factors affecting the surface f CO2 were evaluated using a simple mass balance. Temperature and biological productions by phytoplankton are the main factors for CO2 drawdown from afternoon to early night, while biological respiration increases seawater CO2 at night. Air-sea exchange fraction acts as a CO2 decreasing gear during the study period and is much effective when the wind speed is higher than 2-3 m s-1. Future studies about organic carbon and biological production/respiration are required for evaluating the roles of oyster farms on carbon sink and coastal carbon cycle.
Abstract
Abstract: Real-time monitoring for environmental factors (temperature, salinity, chlorophylla , etc.) and fugacity of carbon dioxide ( f CO2) was conducted at an oyster Crassostrea gigas farm in Goseong Bay, south coast of Korea during 2-4th of November, 2011. Surface temperature and salinity were ranged from 17.9-18.7℃ and 32.7-33.8, respectively, with daily and inter-daily variations due to tidal currents. Surface f CO2 showed a range of 390-510 μatm and was higher than air CO2 during the study period. Surface temperature, salinity and f CO2 are showed significant correlations with chl.a and nutrients, respectively. It means when chl.-a value is high in surface water of the oyster farm, active biological production consume CO2 and nutrients from environments and produce oxygen, suggesting a tight feedback between biological processes and environmental reaction. Thus, factors affecting the surface f CO2 were evaluated using a simple mass balance. Temperature and biological productions by phytoplankton are the main factors for CO2 drawdown from afternoon to early night, while biological respiration increases seawater CO2 at night. Air-sea exchange fraction acts as a CO2 decreasing gear during the study period and is much effective when the wind speed is higher than 2-3 m s-1. Future studies about organic carbon and biological production/respiration are required for evaluating the roles of oyster farms on carbon sink and coastal carbon cycle.
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