Current Research
1.ESTIMATING GLOBAL BROWN CARBON BUDGET AND ITS RADIATIVE FORCING
(Duseong Jo, Rokjin Park)
2.1 EFFECTS OF DRY DEPOSITION PROCESS ON TROPOSPHERIC OZONE SIMULATIONS IN EAST ASIA
(Seungkyu Hong, Rokjin Park)
2.2 SENSITIVITY OF BC SIMULATION TO THE SPATIAL RESOLUTION IN THE KATHMANDU VALLEY
(Seungkyu Hong, Rokjin Park)
3.EFFECTS OF FUTURE CLIMATE CHANGE ON AIR QUALITY
(Minjoong Kim, Rokjin Park)
4.DEVELOPMENT OF HCHO RETRIEVAL ALGORITHM FOR GEOSTATIONARY SATELLITE
(Hyung-ahn Kwon, Rokjin Park)
5.EFFECTS OF SIBERIAN FOREST FIRE ON CLIMATE CHANGE
(Seungun Lee, Rokjin Park)
ESTIMATING GLOBAL BROWN CARBON BUDGET AND ITS RADIATIVE FORCING
BACKGROUND
- Recently, some observations and laboratory studies found that a certain oragnic aerosol can absorb solar radiation - It is called light absorbing organic carbon or brown carbon. Traditionally organic aerosols are treated as light scattering aerosol, so it is significant to modify traditional view when calculating radiative forcing of organic aerosols.
OBJECTIVES
- Our work is to estimate brown carbon global budget and its radiative forcing
APPROACH
- Main sources of brown carbon are biomass burning in smoldering phase and anthropogenic secondary organic aerosols. So we examine the detail of the brown carbon formation mechanism and apply it to chemical transport model to obtain global budget of brown carbon aerosol.
PEOPLE
- Duseong Jo, Rokjin Park
EFFECTS OF DRY DEPOSITION PROCESS ON TROPOSPHERIC OZONE SIMULATIONS IN EAST ASIA
BACKGROUND
- In atmospheric chemistry model, tropospheric ozone is determined by several processes: emission, transport, diffusion, chemical reactions, and deposition. Deposition is divided by two categories: dry deposition and wet deposition. In the case of tropospheric ozone, dry deposition process is the important factor to estimate concentration of tropospheric ozone because dry deposition is the major loss process. However, dry deposition process of tropospheric ozone has an high uncertainty in East Asia. It is crucial to design well-fitted dry deposition scheme for quantitative estimation of tropospheric ozone using atmospheric chemistry model in East Asia.
OBJECTIVES
- Devise well-fitted dry deposition scheme to estimate tropospheirc ozone in East Asia.
APPROACH
- Using a variety of dry deposition schemes, assess the ability of troposheric ozone simulation in East Asia of each scheme. Devise optimized dry deposition scheme in East Aisa and compare it with dry deposition velocity observation.
PEOPLE
- Seungkyu Hong, Rokjin Park
Sensitivity of BC simulation to the spatial resolution in the Kathmandu valley
BACKGROUND
- Observations in the Kathmandu valley show very high black carbon (BC) concentrations during Sustainable Atmosphere for Kathmandu valley (SusKat) campaign. To investigate factors contributing to this high BC during SusKat campain and further estimate the radiative effect of BC in the atmosphere and in snow, we conduct regional chemistry transport model simulations.
OBJECTIVES
- Investigate the factors contributing the high BC concentration in the Kathmandu valley.
APPROACH
- Using regional chemistry transport models with redistributed emission inventory, estimate the factors (meteorology, chemistry, emission, etc.) affecting high BC concentration in Kathmandu valley.
PEOPLE
- Seungkyu Hong, Rokjin Park
EFFECTS OF FUTURE CLIMATE CHANGE ON AIR QUALITY
BACKGROUND
- Weather is a major factor affecting surface air quality, and it follows that climate change could impose a "climate penalty" on pollution control strategies. We are involved in ongoing research to understand the influence of meteorology on present-day air quality.
OBJECTIVES
- Estimate air quality changes due to each climate forcing.
APPROACH
- We apply statistical methods estimating impact of each climate forcing on air quality quantitatively.
PEOPLE
- Minjoong Kim, Rokjin Park
DEVELOPEMENT OF HCHO RETRIEVAL ALGORITHM FOR GEOSTATIONARY SATELLITE
BACKGROUND
- The Korean Ministry of Environment will launch GEOstationary-KOrean MultiPurpose SATellite (GEO-KOMPSAT) in 2018 to monitor the changes of air quality and climate over East Asia. The target measurements of GEMS instrument on the GEO-KOMPSAT include SO2, NO2, O3, HCHO, and aerosols. We develop a retrieval algorithm of HCHO, which is an important oxidation product of hydrocarbon.
OBJECTIVES
- Develop HCHO retrieval algorithm and test sensitivity of retrieved HCHO concentrations with respect to fitting wavelength band, air mass factor (AMF) and other factors.
APPROACH
- Comprise an atmospheric chemistry transport model (CTM), a radiative transfer model (RTM), and a HCHO retrieval algorithm.
PEOPLE
- Hyeong-ahn Kwon, Rokjin J. Park
EFFECTS OF SIBERIAN FOREST FIRE ON CLIMATE CHANGE
BACKGROUND
- The aerosols can absorb or scatter the solar radiation. So it can result in the change of radiation budget of the earth. One of the sources of aerosols is wildfire. Especially, Siberian wildfires are important not only because of the amount of aerosols they emit, but also because their proximity to the Arctic. As the Arctic region is known to have high sensitivity to the climate change, we investivage the effects of Siberian forest fire on the climate change.
OBJECTIVES
- Estimating the climatic effect of smoke aerosols emitted from Siberian forest fires.
APPROACH
- We use 3-D Global Chemical Transport Model(GCTM) to estimate the distribution and transport of smoke aerosols. Together with GCTM, we calculate direct radiative forcing of smoke aerosols as an indicator of climatic effect using Radiative Transfer Model(RTM).
PEOPLE
- Seungun Lee, Rokjin Park