A5074470228- Plant Water Relations and Carbon Dynamics
- Meteorological Phenomena and Simulations
- Atmospheric and Environmental Gas Dynamics
- Climate variability and models
- Urban Heat Island Mitigation
- Wind and Air Flow Studies
- Atmospheric chemistry and aerosols
- Land Use and Ecosystem Services
- Aeolian processes and effects
- Fluid Dynamics and Turbulent Flows
- Cryospheric studies and observations
- Atmospheric aerosols and clouds
- Climate change and permafrost
- Air Quality and Health Impacts
- Remote Sensing in Agriculture
- Soil Moisture and Remote Sensing
- Remote Sensing and Land Use
- Atmospheric Ozone and Climate
- Precipitation Measurement and Analysis
- Geology and Paleoclimatology Research
- Energy Load and Power Forecasting
- Hydrology and Watershed Management Studies
- Advanced Wireless Communication Techniques
- Geophysics and Gravity Measurements
- Urban Green Space and Health
Yonsei University
2015-2024
National Institute for Mathematical Sciences
2010-2011
University of Georgia
2007-2009
Urban heat island (UHI), an iconic consequence of anthropogenic activities and climate condition, affects air pollution, energy use, health. Therefore, better understanding the temporal dynamics UHI is required for sustainable urban planning to mitigate pollution under a changing climate. Here, we present evolution intensity (UHIi) its controlling factors in Seoul metropolitan area, Korea, over last 56 years (1962–2017), which has experienced unique compressed economic growth transformation...
Abstract. Subseasonal-to-seasonal (S2S) prediction, especially the prediction of extreme hydroclimate events such as droughts and floods, is not only scientifically challenging, but also has substantial societal impacts. Motivated by preliminary studies, Global Energy Water Exchanges (GEWEX)/Global Atmospheric System Study (GASS) launched a new initiative called “Impact Initialized Land Surface Temperature Snowpack on Subseasonal to Seasonal Prediction” (LS4P) first international grass-roots...
Abstract Subseasonal-to-seasonal (S2S) precipitation prediction in boreal spring and summer months, which contains a significant number of high-signal events, is scientifically challenging skill has remained poor for years. Tibetan Plateau (TP) observed surface temperatures show lag correlation with several remote regions, but current global land–atmosphere coupled models are unable to represent this behavior due errors producing TP temperatures. To address these issues, the Global Energy...
Abstract. A total of 20 urban neighbourhood-scale eddy covariance flux tower datasets are made openly available after being harmonized to create a 50 site–year collection with broad diversity in climate and surface characteristics. Variables needed as inputs for land models (incoming radiation, temperature, humidity, air pressure, wind precipitation) quality controlled, gap-filled prepended 10 years reanalysis-derived local data, enabling an extended spin up equilibrate conditions. For both...
This paper examines the performance of a stand‐alone version Simple Biosphere Model 2 (SiB2) to investigate accuracy modeled surface energy components, effective radiative temperature, and soil wetness in Tibetan short grass prairie from 15 July 14 September 1998. During this monsoon period mean canopy height leaf area index were 0.05 m 0.5, respectively. The study site represented prevailing conditions high plateau with an average elevation 4500 m. model was initialized using situ...
Core Ideas In the proposed model, wilting point and porosity are a function of organic matter. organic‐rich soil, model improves accuracy microwave radiative transfer model. The is applicable for both portable satellite soil moisture sensors. Most dielectric mixing models have been developed mineral soils without extensive consideration matter (OM). addition, when used in situ measurement, most these focus only on real part effective constant corresponding imaginary part. Organic fractions...
The dilution effect caused by boundary-layer evolution over land has strong influences on air quality. Accurate and continuous measurements of the height urban areas are therefore needed for complete air-quality assessments. Commercial ceilometers, in combination with reliable simple methodologies, can be used to retrieve mixed-layer height, represent a means obtaining information vertical mixing atmospheric structure above cities. Here, we evaluate various retrieval algorithms based...
Abstract The evolution of planetary boundary layer (PBL) was investigated using observations from a laser ceilometer, an eddy covariance system, and automatic meteorological station in the north Nanjing city during air pollution episode 2016–2017 winter. Based on 7‐day observation under clean to polluted day, we recorded temporal variations backscatter signals observed by then intercompared height (PBLH) retrieved individual methods. results show that signal gradient, standard deviation,...
As global warming and climate change become perceived as significant, the release of greenhouse gases (GHGs) stored in earth's polar regions is considered a matter concern. Here, we focused on exploiting GHGs to address potential challenges north regions. In particular, used CO2 soft oxidant recover energy syngas (CO H2) produce biochars from pyrolysis peat moss. expedited homogeneous reaction with volatile matters moss pyrolysis, mechanistic role resulted conversion CO at ≥530 °C. Steel...
Land‐atmosphere interactions on the Tibetan Plateau are important because of their influence energy and water cycles both regional global scales. Flux variance eddy covariance methods were used to measure turbulent fluxes heat, vapor, momentum over a shortgrass prairie during Global Energy Water Cycle Experiment (GEWEX) Asian Monsoon (GAME) in 1998. Under unstable conditions monsoon period (July–September), observed standard deviations temperature specific humidity (normalized by appropriate...
연속적인 지표 플럭스 관측으로부터 축적되는 엄청난 양의 자료를 체계적으로 처리분석하고 종합하여 일관성 있는 결과를 도출해 내려면 에디 공분산 자료 처리 방법의 표준화가 우선되어야 한다. 이 논문에서는 국내 타워 관측 네트워크인 KoFlux의 표준화된 방법을 소개하고, 방법이 다른 경우에 생길 수 플럭스의 불확실성을 평가하였다. 광릉 활엽수림에서 관측된 탄소 경우, 순생태계교환량(net ecosystem exchange, NEE)과 생태계호흡량(ecosystem respiration, Re)은 각각 차이에 따라 민감한 반응을 보였다. 그러나 두 양이 서로 상쇄되어, 총일차생산량(gross primary productivity, GPP=NEE+Re)은 경우에도 불구하고 오차 범위 내에서 일치하였다. 이러한 결과는 GPP를 산출할 때에 Re를 독립적으로 관측하는 것이 중요함을 시사한다. 반면 수증기 플럭스(증발산)의 야간 토양 증발이 작아서 연 적산증발산량은 방법에 민감하지...
Abstract. Accurate and consistent monitoring of anthropogenic combustion is imperative because its significant health environmental impacts, especially at city-to-regional scale. Here, we assess the performance Copernicus Atmosphere Monitoring Service (CAMS) global prediction system using measurements from aircraft, ground sites, ships during Korea-United States Air Quality (KORUS-AQ) field study in May to June 2016. Our evaluation focuses on CAMS CO CO2 analyses as well two...
The monsoon system is an important natural driver of ecosystem carbon and water exchanges in Asia being altered by anthropogenic forcings. This accompanied heavy rainfall typhoons the main growing season, thus causing alterations environmental conditions such as rainfall, wind, temperature; therefore, it acts a disturbance to forests Asia. Therefore, degradation service activity reinforced factors changing climate great concern. In this study, we presented observational evidences for...
Abstract This paper reports on the first attempt to investigate whether excessive precipitation over mountainous areas, which is a common problem in model simulations, could be remedied by implementation of more realistic surface wind field high‐resolution Weather Research and Forecasting (WRF) model. A series 48 h short‐range forecasts was conducted for month July 2006 within triple‐nested WRF configuration, highest resolution 3 km focused areas with complex orography East Asian monsoonal...
Abstract Using the eddy covariance method, this study reports one‐year turbulent fluxes of momentum, energy, and CO 2 , their seasonal variations over a recently redeveloped high‐rise, high‐population, residential area in metropolitan city Seoul, Korea. The is affected by Asian monsoon, which accompanied long rain spells related mid‐season depression solar radiation summer. Our analysis shows that urban surface energy balance turbulence characteristics demonstrate typical properties....
Recent trends of intense forest fires in the Korean Peninsula have increased concerns about more extreme burning future under a warming climate. Accurate and reliable fire weather information has become critical to reduce risk forest-related disasters over complex terrain. In this study, two parameterizations reflecting topographic effects were implemented Weather Research Forecasting (WRF) model. The model performance was evaluated mountainous region Gangwon-do, South Korea’s most...
Korea’s extensive urbanization and industrial activities significantly contribute to anthropogenic greenhouse gas (GHG) emissions therefore measurement, reporting, verification of gases at urban scales is critical for carbon neutrality initiatives. To address this necessity, we have developed a high-resolution regional atmospheric CO₂ CH₄ inverse modeling framework based on the WRF-Chem/DART system. This consists transport model coupled with ensemble Kalman filter data assimilation...
Urban areas are major sources of greenhouse gas emissions and the intensity carbon dioxide (CO₂) fluxes depends on population density, transportation patterns, diverse energy consumption vegetative uptake. A comprehensive understanding balance source attribution is important for effective urban neutrality planning. This study investigates eddy-covariance measured CO₂ their statistical partitioning to various uptake at an residential area park in Seoul, Korea. In area, emission were building...
Abstract. Considering the feedback in radiation, temperature, and soil moisture with alterations rainfall patterns, influence of changing monsoon on Net Ecosystem CO2 Exchange (NEE) can be critical to estimation carbon balance Asia. In this paper, we examined fluxes measured by eddy covariance method from 2004 2008 two major ecosystems KoFlux sites Korea, i.e., Gwangneung Deciduous forest (GDK) Haenam Farmland (HFK). Our objectives were identify repeatability mid-season depression NEE...