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가을철 동해 표층 수온과 태평양 순년 진동의 상관성 분석
박균도,PAK, GYUNDO 한국해양학회 2019 바다 Vol.24 No.4
다양한 표층 수온 자료를 통해 1979년부터 2018년 기간 동안의 가을철 동해 공간 평균 표층 수온이 태평양 순년 진동과 높은 상관관계를 나타내는 것을 확인하였다. 이 해역에서 제트류의 활동이 가장 강한 200 hPa에서의 바람과 동해 표층 수온의 회귀 분석 결과, 가을철 동해 표층 수온이 상승할 때 제트류의 중심축이 북상하면서 전반적으로 제트류가 약화하는 경향을 보이며, 동해 수온이 하강할 때는 제트류의 중심축이 남하하면서 제트류가 강화되는 경향을 보였다. 이러한 분석 결과는 제트류의 강도 변화와 중심축의 남북 진동이 동해 표층 수온과 태평양 순년 진동의 커플링과 관련되어 있음을 시사한다. 여름철의 약한 제트류와 겨울철 및 이른 봄철의 강한 동아시아 동계계절풍 효과는 동해와 태평양 순년 진동의 커플링이 가을철 외의 다른 계절에 잘 나타나지 않게 하는 이유로 생각해볼 수 있다. Analyses with various Sea Surface Temperature (SST) products indicate that the interannual variability of the area-averaged SST in the East/Japan Sea (EJS) is well correlated to that of Pacific Decadal Oscillation (PDO) during 1979-2018, especially in the autumn. The regression analysis with the wind vectors at 200 hPa, where the strongest jet stream flows, suggests that the long-term variability of the intensity as well as the meridional movement of the jet stream are related to the coupling of the autumn EJS SST and PDO. When the axis of the jet stream moves poleward (equatorward) with its weakening (strengthening), both the EJS SST and North Pacific SST increase (decrease). This suggests that both the intensity and meridional movement of the jet stream are possibly related to the coupling of the autumn EJS SST and PDO. However, effects of a weak jet stream during the summer and the strong East Asian winter monsoon make weak coupling between the EJS SST and PDO.
Lagrangian Approach for a New Separation Index of the East Korea Warm Current
박균도,김영호,박영규 한국해양과학기술원 2019 Ocean science journal Vol.54 No.1
In this study, a separation index for the East Korea Warm Current (EKWC) is defined by Lagrangian particle tracking using surface geostrophic currents based on satellite-observed absolute dynamic topography. After determining the main stream from the inflow through the western channel of the Korea Strait, the separation index is obtained by averaging the latitude of the main particle trajectories crossing the meridian along 130.5°E. Although the separation index is obtained from coastal velocity, it describes well the surface circulation patterns in the Ulleung Basin. When it is low (i.e., the EKWC separates at low latitude), the flow toward the Japanese coast is the strongest and the EKWC is weak. In the middle phase of the separation index, a large portion of the EKWC meanders and forms the Ulleung Warm Eddy-like feature. When the separation index is high, the EKWC stretches further northward to almost 40°N. Therefore, the separation index could be used as a simple representation of the surface circulation pattern in the East/Japan Sea.
박균도,노의근,이명인,예상욱,김대현,김상엽,이준리,이호진,현승훤,이광연,이재학,박영규,진현근,박혁민,김영호 한국해양과학기술원 2021 Ocean science journal Vol.56 No.1
We document the performance of a new earth system model developed at Korea Institute of Ocean Science and Technology, called the KIOST-ESM, based on a low-resolution (~ 200 km for the atmosphere, ~ 100 km for the ocean) version of the Geophysical Fluid Dynamics Laboratory Climate Model 2.5. The main changes made to the base model include adopting a unified convection scheme for cumulus convection and an ocean mixed layer parameterization considering Langmuir circulation, which improve the model fidelity significantly. In addition, the KIOST-ESM adopts a new soil respiration scheme in the dynamic vegetation process of its land component. The performance of the KIOST-ESM was assessed in pre-industrial and historical simulations that are made as part of its participation in the Coupled Model Intercomparison Project phase 6 (CMIP6). The response of the earth system to increasing greenhouse gas concentrations was analyzed in the ScenarioMIP simulations. An abrupt quadrupling of CO2 experiment suggests that the equilibrium climate sensitivity of KIOST-ESM is 3.36 K—very close to the averaged one obtained from CMIP5 simulations. Although the KIOST-ESM showed a notable cold bias in the Northern Hemisphere and the double Inter-Tropical Convergence Zone bias, the KIOST-ESM outperforms the base model in simulating the mean sea surface temperature over the Southern Ocean and over the cold tongue in the tropical Pacific. The KIOST-ESM can also simulate the dominant tropical variability in intraseasonal (Madden–Julian Oscillation) and interannual (El Niño-Southern Oscillation) timescales more realistically.
Comparisons of Net Heat Flux Data Sets Over the Western North Pacific
박균도,Jae-Hyoung Park,Jae-Hyoung Park,박영규,장유순 한국해양과학기술원 2020 Ocean science journal Vol.55 No.4
This study focuses on the intercomparisons of 22 net heat flux (NHF) data sets in terms of mean, linear trend, and interannual variability during 1993–2007 over the western North Pacific and its surrounding waters. The data sets can be categorized into the dominant group that shares common interannual variabilities and the outcasts that exhibit exceptional variability. Based on our analysis, we provide guidelines for users to choose reliable NHF data sets in the study regions. In addition, many NHF data sets tend to represent similar interannual variabilities in the marginal sea regions, whereas the opposite is true in open oceans where interannual variability is weak. Also, we find an evidence showing the mean biases of the NHF are mainly due to the difference in calculation of the latent heat flux. The aforementioned information will be useful for a wide community of scientists who are interested in using heat flux data.
박균서(Park Kyun Seo),손철수(Son Chol Su),윤종경(Yun Jong Kyeong),최정열(Choi Jung Youl),박용걸(Park Yong Gul) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
This paper is presented the test results to evaluate the healthiness of the ballast in subway. The test includes the dynamic load test in servicing Line the screen classification test of aggregates and the wear test. From the results, the aspect and the property of the ballast are evaluated. The dynamic load tests the relationship between the deterioration of the ballast and the fluctuation of loads. The assesexplain sment of impact factor based on the field test results in a good property of test blocks is proposed.