한반도 주변 해수면의 장기추세 및 저주파 변동성

Abstract

Long-term trend of relative sea levels (RSL) could be misleading not only when the length of the time series of RSL is not long enough (< 20 years) but also when the local effect is neglected, which is due to any reason such as piling-up of sea levels or moving away of the current path like the branch of Kuroshio. Complemetary data of RSL is sea-surface temperature (SST); the long-term trend of SST increases around the Korean Peninsula during the last decades. RSL at Jeju Island also increases with much higher rate (> +7mm/yr) than the other stations in Korea, which seems to be the local signal of climate change due to global warming. Interannual to interdecadal fluctuation of RSL may cause more coastal erosion than the linear trend, and the design water level (DWL) must be adjusted, based on the local trend of RSL for reducing damages from natural disasters.