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http://dx.doi.org/10.7837/kosomes.2018.24.5.553

Comparison of Distribution and Characteristics of CDOM in Spring 2012 and 2014 in the Southwestern East Sea of Korea  

Park, Hyun-Sil (Korea Marine Environment Management Corporation)
Park, Mi-Ok (Department of oceanography, Pukyong National University)
Publication Information
Journal of the Korean Society of Marine Environment & Safety / v.24, no.5, 2018 , pp. 553-568 More about this Journal
Abstract
Chromophoric Dissolved Organic Matter (CDOM) plays a dominant role in absorbing UV-VIS light and is also important in the biogeochemical carbon cycle due to the production of carbon dioxide from photo-oxidation at the sea surface in marine environments. Since absorption by CDOM was recently found to be responsible for increasing the energy absorbed in the mixed layer by 40 % over pure seawater, the importance of CDOM absorption in seawater for increasing sea surface temperature has come to be well recognized. We measured aCDOM and the absorption characteristics of CDOM during spring 2012 and 2014 in the southwestern East Sea. Distribution of CDOM in spring 2012 and 2014 was compared and S value was used to find the source of CDOM in the study area. As a result, the average $a_{CDOM}$ was $0.237m^{-1}$ ($0.009{\sim}0.988m^{-1}$) and the average S value was $16{\mu}m^{-1}$,which shows coastal properties. Also a positive correlation between Chl a and CDOM was observed ($r^2=0.34$), with an especially strong correlation near coastal stations. aCDOM in 2014 was about 40 % higher than aCDOM in 2012 during spring in the study area. This difference in aCDOM concentration resulted not only from annual variation but also from stratification and photobleaching in late spring 2012. This observation implies the possibility of flux of carbon dioxide into the atmosphere as a result of photo-oxidation in the East Sea.
Keywords
CDOM; S value; Photodegradation; SST; Chl a; Southwestern East Sea;
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