동해 울릉분지에서의 표층 이산화탄소 분압의 최근 변화

Abstract

What determines dissolved CO2 content in the coastal seas are not well defined due largely to sparse observations and complex ecosystem affected by land supply of the materials. We observed pCO2 and relevant parameters for 7 years from 2010 to 2016 to assess the interannual variation of the pCO2 in the (summer) surface seawater in the southern half of the East Sea.Although the surface seawater in the East Sea comes dominantly from the lower latitudes of the North Pacific as a branch of the Kuroshio, inter-annual variation of the surface pCO2 in the Ulleung Basin differed from that in the Yamato Basin the former appears nearly constant during the observation period while the latter shows a decreasing tendency. Similar temporal variations of the salinity to that in the surface pCO2 in both areas imply that contrasting physical forcing may play a role. Since the East Sea throughflow (or Tsushima Warm Current) swept the surface seawater of the southern part of the East Sea, additional dissolved CO2 and salinity must be added to the surface in the Ulleung Basin. We argue that upwelling near the east coast of the Korean peninsula should drive the supply of CO2 and salt. to 2016 to assess the interannual variation of the pCO2 in the (summer) surface seawater in the southern half of the East Sea.Although the surface seawater in the East Sea comes dominantly from the lower latitudes of the North Pacific as a branch of the Kuroshio, inter-annual variation of the surface pCO2 in the Ulleung Basin differed from that in the Yamato Basin the former appears nearly constant during the observation period while the latter shows a decreasing tendency. Similar temporal variations of the salinity to that in the surface pCO2 in both areas imply that contrasting physical forcing may play a role. Since the East Sea throughflow (or Tsushima Warm Current) swept the surface seawater of the southern part of the East Sea, additional dissolved CO2 and salinity must be added to the surface in the Ulleung Basin. We argue that upwelling near the east coast of the Korean peninsula should drive the supply of CO2 and salt.