2002년 여름 북서태평양 표층 해수의 이산화탄소 분포 특성
The Surface fCO2 Distribution of the Western North Pacific in Summer 2002
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Abstract
We measured the fugacity of CO2 ( fCO2), temperature, salinity, nutrients and chlorophyll a in the surface water of the western North Pacific (4o30'~33o10'N, 144o20'~127o35'E) in September 2002. There were zonally several major currents which have characteristics of specific temperature and salinity (NECC, North Equatorial Counter Current; NEC, North Equatorial Current; Kuroshio etc.). Surface fCO2 distribution was clearly distinguished into two groups, tropical and subtropical areas of which boundary was 20oN. In the tropical area, surface fCO2 was mainly controlled by temperature, while in the subtropical area,surface fCO2 was dependent on total inorganic carbon contents. Air-sea CO2 flux showed a large spatial variation, with a range of .0.69~0.79 mmole m.2 day.1. In the area of AE (Anticyclonic Eddy), SM (Southern Mixed region) and NM (Northern Mixed region), the ocean acted as a weak source of CO2 (0.6~0.79 mmole m.2 day.1). In NECC, NEC, Kuroshio and ECS (East China Sea), however, the fluxes were estimated to be .0.3 mmole m.2 day.1 for the first three regions and .1.2 mmole m.2 day.1 for ECS respectively, indicating that these areas acted as sinks of CO2. The average air-sea flux in the entire study area was 0.15 mmole m.2 day.1, implying that the western North Pacific was a weak source of CO2 during the study period.
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