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Lie H.-J.,Physical Oceanography DivisionKorea Institute of Ocean Science and TechnologyAnsan South Korea | Cho C.-H.,Physical Oceanography DivisionKorea Institute of Ocean Science and TechnologyAnsan South Korea | Jung K.T.,Marine Radionuclide Research Center
Journal of Geophysical Research C: Oceans | Year: 2015

Temperature inversion (higher temperature at a deeper depth) in winter and its relation to advection were investigated by analyzing both conductivity-temperature-depth data in the southern Yellow Sea (YS) and northwestern East China Sea during the winter of 2002-2003 and time series data of temperature, salinity, and currents at a buoy station at the YS entrance. Significant temperature inversions occur predominantly along the thermohaline front at the YS entrance where the Cheju Warm Current Water (CWCW) and the cold coastal waters meet. In February 2003, on the northern frontal zone along 34°N where isotherms and isohalines declined downward to the north, particularly large inversions with temperature differences of larger than 2.0°C were observed to occur more in troughs than in the crests of the wave-like frontal meander where the cold Korean coastal water (KCW) advances farther southward. The inversion persisted until mid-April at the buoy station in the frontal zone, and both temperature and salinity showed simultaneous variations in the same manner. During episodic occurrences of large inversions, temperature and salinity decreased sharply in the upper layer, but increased concurrently in the lower layer. These episodic inversions were found to be closely related to the westward advection of the KCW in the upper layer and the northward advection of the CWCW in the lower layer. It is considered that these advections may play an important role in maintaining baroclinicity in the northern frontal zone, which is responsible for driving the westward transversal flow across the YS entrance. © 2015. The Authors.


Yuk J.-H.,Korea Institute of Science and Technology | Kim K.O.,Marine Radionuclide Research Center | Choi B.H.,Sungkyunkwan University
Ocean Science Journal | Year: 2015

The Yellow and East China Seas are characterized by shallow shelf seas, seasonal monsoons and typhoons, especially the Korean Peninsula’s western coastal area, which features large tides, a complex coastline and many islands. This study implemented an integrally coupled tide-surge-wave model based on an unstructured grid to evaluate the impact of Typhoon Sarah, which occurred in September of 1959, on the Yellow and East China Seas and, specifically, the southern coast of Korea in terms of waves and storm surges. The model results projected a significant wave height of 2–7 m, a mean wave period of 4–14 sec, and positive surge heights that were 0.3–1 m along the southern coast of Korea. Additional model runs included two independent model runs for waves and tides, and one tide-surge model run was conducted to investigate the interactions in the wave, tide and storm surge processes. The coupled tide-surgewave model reasonably reproduced wave properties and storm surges, but uncoupled models, i.e. independent models, slightly overestimated waves and surges. The wave forces associated with the gradient radiation stress resulted in water being elevated into coastal regions, thereby the water elevation increased onshore and the reverse happened offshore. A possible water level change due to a storm equivalent to Typhoon Sarah in the year 2100 was estimated by considering a mean sea level rise of 70 cm and was generally in the range of 70–100 cm in the Yellow and East China Seas and approximately 68 cm along the southern coast of Korea. © 2015, Korea Ocean Research & Development Institute (KORDI) and the Korean Society of Oceanography (KSO) and Springer Science+Business Media Dordrecht.


Choi B.H.,Sungkyunkwan University | Kim K.O.,Marine Radionuclide Research Center | Min B.,Korea Atomic Energy Research Institute | Pelinovsky E.,Nizhny Novgorod State Technical University
Ocean and Polar Research | Year: 2014

The 2011 Tohoku earthquake triggered extremely destructive tsunami waves which propagated over the Pacific Ocean, Atlantic Ocean through Drake Passage and Indian Ocean respectively. A total of 10 tide-gauge records collected from the UNESCO/IOC site were analyzed through a band-pass digital filtering device to examine the observed tsunami characteristics. The ray tracing method and finite-difference model with GEBCO 30 arc second bathymetry were also applied to compare the travel times of the Tohoku-originated tsunami, particularly at Rodrigues in the Indian Ocean and King Edward Point in the Atlantic Ocean with observation-based estimates. At both locations the finite-difference model produced the shortest arrival times, while the ray method produced the longest arrival times. Values of the travel time difference however appear to be within tolerable ranges, considering the propagation distance of the tsunami waves. The observed tsunami at Rodrigues, Mauritius in the west of the Madagascar was found to take a clockwise travel path around Australia and New Zealand, while the observed tsunami at King Edward Point in the southern Atlantic Ocean was found to traverse the Pacific Ocean and then passed into the Atlantic Ocean through the Drake Strait. The formation of icebergs captured by satellite images in Sulzberger in the Antarctica also supports the long-range propagation of the Tohoku-originated tsunami. © 2014, Korea Ocean Research and Development Institute. All rights reserved.


Choi B.H.,Sungkyunkwan University | Kim K.O.,Marine Radionuclide Research Center | Yuk J.-H.,Disaster Management Technology Research Center | Kaistrenko V.,Russian Academy of Sciences | Pelinovsky E.,Nizhny Novgorod State Technical University
Ocean and Polar Research | Year: 2015

An approach based on the combined use of a 2D shallow water model and analytical 1D long wave run-up theory is proposed which facilitates the forecasting of tsunami run-up heights in a more rapid way, compared with the statistical or empirical run-up ratio method or resorting to complicated coastal inundation models. Its application is advantageous for long-term tsunami predictions based on the modeling of many prognostic tsunami scenarios. The modeling of the Chilean tsunami on February 27, 2010 has been performed, and the estimations of run-up heights are found to be in good agreement with available observations. © 2015, Korea Ocean Research and Development Institute. All rights reserved.


Kim K.O.,Marine Radionuclide Research Center | Kim D.C.,Hyein E and C Co. | Yuk J.-H.,Disaster Management Technology Research Center | Pelinovsky E.,Nizhny Novgorod State Technical University | Choi B.H.,Sungkyunkwan University
Ocean and Polar Research | Year: 2015

In this paper we investigated the phenomenon of extreme run-up at Babi Island in Indonesia caused by the 1992 Flores earthquake (Mw = 7.8) using a series of three-dimensional numerical modelling experiments. Simulations were carried out to investigate how much the presence/absence of the coast of Flores affects the generation of the extreme inundation at Babi Island through the reflection process of tsunami waves. © 2015 Korea Ocean Research and Development Institute. All rights reserved.

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