Yang-Gi Jo

There are many island stations that routinely observe sea fog around the Korean peninsula. Historical daytime sea fog data were used to investigate the relationships between sea fog occurrence and its associated environmental factors. The frequency of sea fog occurrence is at its maximum in July in all seas around the Korean peninsula. The frequency shows a maximum in the west sea and a minimum in the east sea in spite of their similar latitude. The value of the air temperature minus the sea sur

Hydrographic studies show the seasonal variation of the East Korean Warm Current (EKWC), which is a branch of the Tsushima Current along the Korean coast. To understand the dynamics of the branching mechanism of the TC in the Korea Strait, a hydraulic model with two active layers was investigated in a rectangular strait with varying depth. When the lower cold water flows southward in a shallow meridional channel from the deep northern basin, it separates from the eastern boundary because of the

The connectivity among straits of the northwest Pacific marginal seas is investigated with a primitive‐equation ocean circulation model simulated for 10 years from 1994 to 2003. Over the simulation interval the temporal and spatial means and variations of the model sea surface temperature are comparable to those of the satellite sea surface temperature. The model transport through the straits shows good agreement with the available observations and a high seasonality in the Taiwan Strait, the Ko

Global climate models (GCMs) have limited capacity in simulating spatially non-uniform sea-level rise owing to their coarse resolutions and absence of tides in the marginal seas. Here, regional ocean climate models (RCMs) that consider tides were used to address these limitations in the Northwest Pacific marginal seas through dynamical downscaling. Four GCMs that drive the RCMs were selected based on a performance evaluation along the RCM boundaries, and the latter were validated by comparing hi

Abstract To examine the evolution of the wind‐driven flows in the Yellow Sea (YS) during winter, ocean circulation was simulated using a three‐dimensional ocean model with realistic topography and atmospheric forcing. The simulated sea surface temperature, ocean currents, and path of the Yellow Sea Warm Current (YSWC) agreed with observations. Southward currents along the Korean coast and the Chinese coast in winter were also effectively identified. Spectra of the daily mean winds and the YSWC v

Abstract In the northwestern Pacific marginal seas, there has been a rapid temporal increase and spatial variability in the relative abundance of dissolved inorganic nitrogen over dissolved inorganic phosphate. The cause and mechanisms of this temporal and spatial variation is under debate. Recently, atmospheric deposition of nitrogen has been shown to be the major cause of the spatio‐temporal variation in the concentration ratio of dissolved nitrogen and phosphate. We show that the transport by

Abstract This study presents future climate change projections in the Northwest Pacific (NWP) marginal seas using dynamic downscaling from global climate models (GCMs). A regional climate model (RCM) for the Northwest Pacific Ocean was setup and integrated over the period from 2001 to 2100. The model used forcing fields from three different GCM simulations to downscale the effect of global climate change. MIROC, ECHAM, and HADCM were selected to provide climate change signals for the RCM. These

[1] To understand the effect of a tidal flat on the seawater temperature near a macrotidal flat, the heat flux was calculated using the unstructured grid, finite-volume coastal ocean model (FVCOM). For this study, a code for calculating the sediment temperature was added to include the heat exchange between seawater and the seabed. Seawater provides heat to the seabed at the intertidal zone (tidal flat) during the morning flood tide and gains heat from the seabed during the afternoon flood tide.

Unprecedented coastal upwelling off the southern coast of the Korean Peninsula was reported during the summer of 2013. The upwelling continued for more than a month after a plunge in upwelling-favourable winds and had serious impacts on fisheries. This is a rare phenomenon, as most coastal upwelling events relax a few days after the wind weakens. In this study, observational data and numerical modelling results were analysed to investigate the cause of the upwelling and the reason behind it bein