1995년부터 2004년까지 관측을 통한 동해 울릉분지의 표층 이산화탄소의 빠른 증가와 해양 산성화

Abstract

Anthropogenic carbon is responsible for both global warming and ocean acidification. Efforts are underway to understand the role of ocean in a high CO2 world on a global context. However, marginal seas received little attention despite their significant contribution to biogeochemical cycles. Here we report that the CO2 increase and ocean acidification in the surface waters of the Ulleung Basin (UB) of the East/Japan Sea are much faster than the global mean, and possible causes are discussed. Twelve observations of surface fCO2 were made in the period from 1995 to 2004. The decadal trend of fCO2 increment was estimated by harmonic analysis. The estimated rates of increase of fCO2 were 1.97 μatmyr&#8722 1 for the atmosphere and 3.36 μatmyr&#8722 1 for the surface ocean. The rates exceed the global mean of 1.5 μatmyr&#8722 1. The ocean acidification trend, calculated from total alkalinity and fCO2, was estimated to be 0.04 pH units decade&#8722 1. Surface seawater of the UB has been acidified more rapidly compared to the global mean (0.02 pH units decade&#8722 1). Results show that, if warming strengthens the currents or advection in the marginal seas, biological pump will be enhanced. This would lead to compensation for the presumed reduction in oceanic uptakeof atmospheric CO2 in the warmer world, which warrants quantification worldwide.r significant contribution to biogeochemical cycles. Here we report that the CO2 increase and ocean acidification in the surface waters of the Ulleung Basin (UB) of the East/Japan Sea are much faster than the global mean, and possible causes are discussed. Twelve observations of surface fCO2 were made in the period from 1995 to 2004. The decadal trend of fCO2 increment was estimated by harmonic analysis. The estimated rates of increase of fCO2 were 1.97 μatmyr&#8722 1 for the atmosphere and 3.36 μatmyr&#8722 1 for the surface ocean. The rates exceed the global mean of 1.5 μatmyr&#8722 1. The ocean acidification trend, calculated from total alkalinity and fCO2, was estimated to be 0.04 pH units decade&#8722 1. Surface seawater of the UB has been acidified more rapidly compared to the global mean (0.02 pH units decade&#8722 1). Results show that, if warming strengthens the currents or advection in the marginal seas, biological pump will be enhanced. This would lead to compensation for the presumed reduction in oceanic uptakeof atmospheric CO2 in the warmer world, which warrants quantification worldwide.