Analyzing the Characteristics of Atmospheric Stability from Radiosonde Observations in the Southern Coastal Region of the Korean Peninsula during the Summer of 2019

2021 ◽  
Vol 42 (5) ◽  
pp. 496-503
Author(s):  
Seungsook Shin ◽  
Sung-Eun Hwang ◽  
Young-Tae Lee ◽  
Byung-Taek Kim ◽  
Ki-Hoon Kim
Keyword(s):  
Korean Peninsula ◽  
Atmospheric Stability ◽  
Coastal Region

scholarly journals Estimation of Strong Wind Distribution on the Korean Peninsula for Various Recurrence Periods: Significance of Nontyphoon Conditions

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Jae-Hee Hahm ◽  
Ha-Yoon Jeong ◽  
Kyung-Hwan Kwak
Keyword(s):  
Wind Speed ◽  
Korean Peninsula ◽  
Model Simulation ◽  
Action Plan ◽  
Wrf Model ◽  
Coastal Region ◽  
Gumbel Distribution ◽  
Strong Wind ◽  
Coastal Regions ◽  
Strong Winds

Long-term automated synoptic observing system (ASOS) data collected from 101 stations over a period of 50 years (1967–2016) were analyzed to investigate the distribution of strong winds on the Korean peninsula by utilizing a statistical method. The Gumbel distribution was used to estimate the wind speed for recurrence periods of 1, 10, 50, 75, and 100 years. For all recurrence periods, the coastal regions experienced higher wind speeds, which exceeded the strong wind advisory level, than the inland and metropolitan regions. The strong winds were predominantly induced by summertime typhoons, especially in the south and west coastal regions. In addition, nontyphoon factors, such as a topographical factor with atmospheric instability in a mountainous coastal region, can cause localized severe weather in the form of strong wind. By performing the weather research and forecasting (WRF) model simulation, an abrupt increase in wind speed up to 20 m·s−1 was reproduced under the condition of onshore prevailing winds heading toward a mountain ridge in a coastal region. Estimation of strong wind spatial distribution can help the region-to-region establishment of an action plan to prepare for damage caused by strong winds.

Unprecedented coastal upwelling in the southern coast of the Korean peninsula during summer 2013

2020 ◽  
Author(s):  
Jihun Jung ◽  
Yang-Ki Cho
Keyword(s):  
Water Temperature ◽  
Sea Level ◽  
Korean Peninsula ◽  
Coastal Upwelling ◽  
Cold Water ◽  
Coastal Region ◽  
Southern Coast ◽  
Geostrophic Adjustment ◽  
Long Time ◽  
Bottom Cold Water

<p>Unprecedented coastal upwelling in the southern coast of the Korean peninsula was reported in the summer of 2013. The offshore water temperature was 2℃ higher than that of climate (10-year mean) due to the hot summer in 2013. However, the water temperature at the coastal region was 2℃ lower. The upwelling continued for a month despite of weakening of upwelling-favorable wind. In this study, observational data and numerical model results were analyzed to investigate what caused the upwelling and sustained it for a long time. The upwelling was induced by upwelling-favorable wind in July. Coastal upwelling resulted in dynamic uplift of bottom cold water due to geostrophic adjustment. The dynamic uplift decreased sea level in the coastal region. The sea level difference between coastal and offshore regions resulted in an intensified cross-shore pressure gradient which induced geostrophic current accompanied by geostrophic adjustment along the coast. This positive feedback between dynamic uplift and geostrophic adjustment sustained the coastal upwelling for a long time regardless of upwelling-favorable wind.</p>

Application of Real-time Monitoring Buoy Systems for Physical and Biogeochemical Parameters in the Coastal Ocean around the Korean Peninsula

2005 ◽  
Vol 39 (2) ◽  
pp. 70-80 ◽  
Author(s):  
SungHyun Nam ◽  
Guebuem Kim ◽  
Kyung-Ryul Kim ◽  
Kuh Kim ◽  
Lawrence Oh Cheng ◽  
...  
Keyword(s):  
Real Time ◽  
Korean Peninsula ◽  
Time Series Data ◽  
Coastal Region ◽  
Series Data ◽  
Physical Parameters ◽  
Potential Contribution ◽  
Coastal Regions ◽  
Frequency Monitoring ◽  
Monitoring Buoy

We introduce technological achievements while developing real-time ocean monitoring buoy systems in the key coastal regions around the Korean peninsula, and highlight their potential contribution to oceanographic studies in the region. Major achievements are an integration of physical and biogeochemical sensors, real-time and two-way communication, sustainable maintenance with stable power supply and mooring design, and the two-way control of sensor and sampling strategies with high sampling rates (as often as every minute). The time-series data from two buoy systems deployed in the key coastal regions are given as examples to show their potential use in studying oceanographic issues, such as major current variations along the east coast of Korea, wind-driven episodic events including typhoon passages, and frequent changes due to internal wave passages. The real-time and high-frequency monitoring of biogeochemical properties of seawater together with physical parameters could be used for numerous oceanographic studies in the coastal region, i.e., air-sea gas exchange, harmful dinoflagellate bloom, interaction between physical and biogeochemical processes.

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