Korean Ocean Research and Development Institute

About: Korean Ocean Research and Development Institute is a facility organization based out in Busan, South Korea. It is known for research contribution in the topics: Sea surface temperature & Gene. The organization has 1770 authors who have published 3032 publications receiving 50142 citations.

Improvement of SMAP sea surface salinity in river-dominated oceans using machine learning approaches

Abstract: Sea salinity is one of the indicators of the global water cycle and affects the surface and deep circulation of the ocean. While passive microwave satellite sensors have been used to monitor sea su...

Screening enantioselective epoxide hydrolase activities from marine microorganisms: detection of activities in Erythrobacter spp.

Abstract: To develop an enantioselective epoxide hydrolase (EHase) from marine microorganisms, marine samples were collected from a variety of marine environments. Strains isolated by the capability of living on styrene oxide (SO) were screened for retaining enantioselective EHase activities toward SO by combining spectrophotometric, GC, and HPLC analysis. Consequently, one strain, JCS358, was selected, and the sequence analysis of 16S rRNA gene showed that the strain belonged to Erythrobacter cluster. Twelve additional Erythrobacter strains from this study or acquired from culture collections were thereby tested for displaying EHase activities, and most of tested strains showed enantioselective hydrolysis toward SO and glycidyl phenyl ether. Kinetic resolution of racemic SO using whole cell of Erythrobacter sp. JCS358 was performed. Enantiopure (S)-SO could be obtained with an enantiomeric excess (ee) higher than 99% after 15 h incubation. The determination of 1-phenyl-1,2-ethanediol configuration derived from racemic SO confirmed the enantioselective hydrolyzing activity of Erythrobacter sp. JCS358.

Zooplankton and micronekton respond to climate fluctuations in the Amundsen Sea polynya, Antarctica.

Abstract: The vertical migration of zooplankton and micronekton (hereafter ‘zooplankton’) has ramifications throughout the food web. Here, we present the first evidence that climate fluctuations affect the vertical migration of zooplankton in the Southern Ocean, based on multi-year acoustic backscatter data from one of the deep troughs in the Amundsen Sea, Antarctica. High net primary productivity (NPP) and the annual variation in seasonal ice cover make the Amundsen Sea coastal polynya an ideal site in which to examine how zooplankton behavior responds to climate fluctuations. Our observations show that the timing of the seasonal vertical migration and abundance of zooplankton in the seasonally varying sea ice is correlated with the Southern Annular Mode (SAM) and El Nino Southern Oscillation (ENSO). Zooplankton in this region migrate seasonally and overwinter at depth, returning to the surface in spring. During +SAM/La Nina periods, the at-depth overwintering period is shorter compared to −SAM/El Nino periods, and return to the surface layers starts earlier in the year. These differences may result from the higher sea ice cover and decreased NPP during +SAM/La Nina periods. This observation points to a new link between global climate fluctuations and the polar marine food web.

Deep Fault Plane Revealed by High-Precision Locations of Early Aftershocks Following the 12 September 2016 ML 5.8 Gyeongju, Korea, Earthquake

Abstract: An M-L 5.8 earthquake, which is large for a stable continental region, occurred in southeastern Korea on 12 September 2016. Ten days of data from a temporary seismic network deployed immediately after the mainshock are combined with data from permanent seismic stations to determine high-precision locations of early aftershocks to reveal the geometry of the causative structure at depth. Well-constrained relative earthquake hypocenters and focal mechanisms are used to define the subsurface fault plane with a strike of similar to N28 degrees E and dip of similar to 78 degrees to the east-southeast. This fault plane extends from 12 to 15 km depth and may have been responsible for most of the early earthquakes in the Gyeongju earthquake sequence. A pre-existing weak zone in a strike-slip duplex that formed from subsidiary Riedel shears beneath the Yangsan fault system may have been reactivated to nucleate the mainshock and aftershocks.