동해의 일차생산력은 다른 해양에 비하여 상대적으로 높은 수준을 나타내는 것으로 나타났다. 이와 같이 동해에서의 높은 기초생산력은 수주의 물리·화학적 연직구조에 의해서 결정되는 것을 밝혔다. 동해에서는 쿠로시오 본류인 서태평양대양과 쿠로시오에서 쓰시마난류수로 분지되어 흐르는 동중국해에 비해 수온약층이 얕았으며, 이로 인해 질산염 약층이 유광층 내에 분포하였고 ...
동해의 일차생산력은 다른 해양에 비하여 상대적으로 높은 수준을 나타내는 것으로 나타났다. 이와 같이 동해에서의 높은 기초생산력은 수주의 물리·화학적 연직구조에 의해서 결정되는 것을 밝혔다. 동해에서는 쿠로시오 본류인 서태평양대양과 쿠로시오에서 쓰시마난류수로 분지되어 흐르는 동중국해에 비해 수온약층이 얕았으며, 이로 인해 질산염 약층이 유광층 내에 분포하였고 유광층으로 질산염이 원활히 공급되었다. 이러한 물리·화학적 요인에 의해 동해에서 신생산력이 비교적 높게 기록된 반면 재생산은 해역간에 유의한 차이를 나타나지 않았다. 따라서 서태평양과 동중국해보다 동해에서 높은 일차생산력은 바로 동해에서 저층의 풍부한 질산염의 유광층으로의 활발한 공급에 따른 높은 f-ratio에 기인하는 것으로 밝혀졌다.
동해의 일차생산력은 다른 해양에 비하여 상대적으로 높은 수준을 나타내는 것으로 나타났다. 이와 같이 동해에서의 높은 기초생산력은 수주의 물리·화학적 연직구조에 의해서 결정되는 것을 밝혔다. 동해에서는 쿠로시오 본류인 서태평양대양과 쿠로시오에서 쓰시마난류수로 분지되어 흐르는 동중국해에 비해 수온약층이 얕았으며, 이로 인해 질산염 약층이 유광층 내에 분포하였고 유광층으로 질산염이 원활히 공급되었다. 이러한 물리·화학적 요인에 의해 동해에서 신생산력이 비교적 높게 기록된 반면 재생산은 해역간에 유의한 차이를 나타나지 않았다. 따라서 서태평양과 동중국해보다 동해에서 높은 일차생산력은 바로 동해에서 저층의 풍부한 질산염의 유광층으로의 활발한 공급에 따른 높은 f-ratio에 기인하는 것으로 밝혀졌다.
The Tsushima Warm Current (TWC) is branched from the Kurosio in the western Pacific Ocean (WPO), flows northward through the East China Sea, and carries warm, low-salinity water into the East/Japan Sea (EJS) through the narrow Tsushima channel. The spatial dynamics of primary, new and regenerated pr...
The Tsushima Warm Current (TWC) is branched from the Kurosio in the western Pacific Ocean (WPO), flows northward through the East China Sea, and carries warm, low-salinity water into the East/Japan Sea (EJS) through the narrow Tsushima channel. The spatial dynamics of primary, new and regenerated production in summer in the TWC system were studied during a cruise in June-August 2008. Along with the carbon and nitrogen (ammonia and nitrate) uptake rates using ^(13)C and ^(15)N tracer experiments, temperature and salinity profiles, and ambient and chlorophyll a concentrations were determined. The primary productivity in the EJS (mean ± S.D, 0.95 ± 0.68 g C m^(-2)d^(-1)) was higher than in the ECS and WPO (0.33 ± 0.14 g C m^(-2)d^(-1)). The new productivity in the EJS (0.30 ± 0.36 g N m^(-2)d^(-1)) was much higher than those (0.01 ± 0.00 g N m^(-2)d^(-1)) in the ESS and the WPO, with the highest level in the upwelling region (up to 0.90 g N m^(-2)d^(-1)). Shallow thermocline in the EJS led to high nitrate upward flux to euphotic zone compared to the ECS and the WPO where the thermocline was formed in the deep layer. Therefore, the new productivity in the surface mixed layer was positively correlated to nitrate upward flux from deep water to the mixed layer (R2=0.992). The f-ratio, representing the new production portion of the total production, was higher (0.49 ± 0.22) than those (0.07 ± 0.02) in the ECS and the WPO where regenerated production was dominant. The primary productivity was well correlated to the new productivity (R2=0.936). In conclusion, the high summer primary productivity in the EJS seemed to result from the high f-ratio due to the shallower thermocline depth and high nitrate upward flux and thereby high new productivity.
The Tsushima Warm Current (TWC) is branched from the Kurosio in the western Pacific Ocean (WPO), flows northward through the East China Sea, and carries warm, low-salinity water into the East/Japan Sea (EJS) through the narrow Tsushima channel. The spatial dynamics of primary, new and regenerated production in summer in the TWC system were studied during a cruise in June-August 2008. Along with the carbon and nitrogen (ammonia and nitrate) uptake rates using ^(13)C and ^(15)N tracer experiments, temperature and salinity profiles, and ambient and chlorophyll a concentrations were determined. The primary productivity in the EJS (mean ± S.D, 0.95 ± 0.68 g C m^(-2)d^(-1)) was higher than in the ECS and WPO (0.33 ± 0.14 g C m^(-2)d^(-1)). The new productivity in the EJS (0.30 ± 0.36 g N m^(-2)d^(-1)) was much higher than those (0.01 ± 0.00 g N m^(-2)d^(-1)) in the ESS and the WPO, with the highest level in the upwelling region (up to 0.90 g N m^(-2)d^(-1)). Shallow thermocline in the EJS led to high nitrate upward flux to euphotic zone compared to the ECS and the WPO where the thermocline was formed in the deep layer. Therefore, the new productivity in the surface mixed layer was positively correlated to nitrate upward flux from deep water to the mixed layer (R2=0.992). The f-ratio, representing the new production portion of the total production, was higher (0.49 ± 0.22) than those (0.07 ± 0.02) in the ECS and the WPO where regenerated production was dominant. The primary productivity was well correlated to the new productivity (R2=0.936). In conclusion, the high summer primary productivity in the EJS seemed to result from the high f-ratio due to the shallower thermocline depth and high nitrate upward flux and thereby high new productivity.
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