A5050163637- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Air Quality Monitoring and Forecasting
- Air Quality and Health Impacts
- Calibration and Measurement Techniques
- Ionosphere and magnetosphere dynamics
- Planetary Science and Exploration
- Geophysics and Gravity Measurements
- Astro and Planetary Science
- Geochemistry and Geologic Mapping
- Solar Radiation and Photovoltaics
- Water Quality Monitoring and Analysis
- Impact of Light on Environment and Health
- Spacecraft Design and Technology
- Climate variability and models
- Aeolian processes and effects
- Advanced Radiotherapy Techniques
- Urban Heat Island Mitigation
- Meteorological Phenomena and Simulations
- Earthquake Detection and Analysis
- Space Exploration and Technology
- Vehicle emissions and performance
- COVID-19 impact on air quality
Yonsei University
2016-2025
Samsung (South Korea)
2021-2023
Corning (United States)
2022
Harvard University Press
2022
Center for Astrophysics Harvard & Smithsonian
2016-2019
Universidad de Valladolid
2019
Harvard University
2017-2018
Dankook University
2002-2016
Inje University
2015
Korea Aerospace Research Institute
1997-2014
The Geostationary Environment Monitoring Spectrometer (GEMS) is scheduled for launch in February 2020 to monitor air quality (AQ) at an unprecedented spatial and temporal resolution from a geostationary Earth orbit (GEO) the first time. With development of UV–visible spectrometers sub-nm spectral sophisticated retrieval algorithms, estimates column amounts atmospheric pollutants (O3, NO2, SO2, HCHO, CHOCHO, aerosols) can be obtained. To date, all satellite missions monitoring have been low...
The Korea-United States Air Quality (KORUS-AQ) field study was conducted during May-June 2016. effort jointly sponsored by the National Institute of Environmental Research South Korea and Aeronautics Space Administration United States. KORUS-AQ offered an unprecedented, multi-perspective view air quality conditions in employing observations from three aircraft, extensive ground-based network, ships along with array forecast models. Information gathered is contributing to improved...
This global study, which has been coordinated by the World Meteorological Organization Global Atmospheric Watch (WMO/GAW) programme, aims to understand behaviour of key air pollutant species during COVID-19 pandemic period exceptionally low emissions across globe. We investigated effects differences in both and regional local meteorology 2020 compared with 2015–2019. By adopting a globally consistent approach, this comprehensive observational analysis focuses on changes quality around cities...
Abstract. Persistent high aerosol loadings together with extremely population densities have raised serious air quality and public health concerns in many urban centers East Asia. However, ground-based monitoring is relatively limited this area. Recently, satellite-retrieved Aerosol Optical Depth (AOD) at resolution has become a powerful tool to characterize patterns space time. Using ground AOD observations from the Robotic Network (AERONET) Distributed Regional Gridded Observation Networks...
Abstract. The Geostationary Ocean Color Imager (GOCI) Yonsei aerosol retrieval (YAER) version 1 algorithm was developed to retrieve hourly optical depth at 550 nm (AOD) and other subsidiary properties over East Asia. GOCI YAER AOD had accuracy comparable ground-based satellite-based observations but still errors because of uncertainties in surface reflectance simple cloud masking. In addition, near-real-time (NRT) processing not possible a monthly database for each year encompassing the day...
Abstract. The Geostationary Ocean Color Imager (GOCI) onboard the Communication, Ocean, and Meteorological Satellite (COMS) is first multi-channel ocean color imager in geostationary orbit. Hourly GOCI top-of-atmosphere radiance has been available for retrieval of aerosol optical properties over East Asia since March 2011. This study presents improvements made to Yonsei Aerosol Retrieval (YAER) algorithm together with validation results during Distributed Regional Gridded Observation...
Abstract. This paper is an overview of the progress in sky radiometer technology and development network called SKYNET. It found that has produced useful on-site calibration methods, retrieval algorithms, data analyses from observations aerosol, cloud, water vapor, ozone. A formula was proposed for estimating accuracy constant F0 using improved Langley (IL) method, which to be a good approximation observed monthly mean uncertainty F0, around 0.5 % 2.4 at Tokyo Rome sites smaller values 0.3...
Abstract Planned geostationary satellites will provide aerosol optical depth (AOD) retrievals at high temporal and spatial resolution which be incorporated into current assimilation systems that use low‐Earth orbiting (e.g., Moderate Resolution Imaging Spectroradiometer (MODIS)) AOD. The impacts of such additions are explored in a real case scenario using AOD from the Geostationary Ocean Color Imager (GOCI) on board Communication, Ocean, Meteorology Satellite, satellite observing northeast...
Abstract. Recently launched multichannel geostationary Earth orbit (GEO) satellite sensors, such as the Geostationary Ocean Color Imager (GOCI) and Advanced Himawari (AHI), provide aerosol products over East Asia with high accuracy, which enables monitoring of rapid diurnal variations transboundary transport aerosols. Most studies to date have used low (LEO) Moderate Resolution Imaging Spectroradiometer (MODIS) Multi-angle (MISR), a maximum one or two overpass daylight times per day from...
Abstract. Formaldehyde (HCHO) in the ambient air not only causes cancer but is also an ideal indicator of volatile organic compounds (VOCs), which are major precursors ozone (O3) and secondary aerosol (SOA) near surface. It meaningful to differentiate between direct emission formation HCHO for pollution control sensitivity studies O3 production. However, understanding sources still poor China, due scarcity field measurements (both spatially temporally). In this study, tropospheric vertical...
Himawari-8, a next-generation geostationary meteorological satellite, was successfully launched by the Japanese Meteorological Agency (JMA) on 7 October 2014 and has been in official operation since July 2015. The Advanced Himawari Imager (AHI) onboard Himawari-8 16 channels from 0.47 to 13.3 μm performs full-disk observations every 10 min. This study describes AHI aerosol optical property (AOP) retrieval based multi-channel algorithm using three visible one near-infrared (470, 510, 640, 860...
Abstract. Long-term exposure to particulate matter (PM) with aerodynamic diameters < 10 (PM10) and 2.5 µm (PM2.5) has negative effects on human health. Although station-based PM monitoring been conducted around the world, it is still challenging provide spatially continuous information for vast areas at high spatial resolution. Satellite-derived aerosol such as optical depth (AOD) frequently used investigate ground-level concentrations. In this study, we combined multiple...
Abstract. Over the past 24 years, AErosol RObotic NETwork (AERONET) program has provided highly accurate remote-sensing characterization of aerosol optical and physical properties for an increasingly extensive geographic distribution including all continents many oceanic island coastal sites. The measurements retrievals from AERONET global network have addressed satellite model validation needs very well, but there been challenges in making comparisons to similar parameters situ surface...
To quantify the impact of direct aerosol effect accurately, this study incorporated Geostationary Ocean Color Imager (GOCI) optical depth (AOD) into a coupled meteorology-chemistry model. We designed three model simulations to observe AOD assimilation and feedback during KORUS-AQ campaign (May - June 2016). By assimilating GOCI with high temporal spatial resolutions, we improve statistics from comparison AERONET data (RMSE: 0.12, R: 0.77, IOA: 0.69, MAE: 0.08). The inclusion aerosols...
In this study, we examined the change rates of PM2.5 concentrations, aerosol optical depth (AOD), and concentrations precursors, such as SO2 NO2, in China South Korea using surface satellite observations from 2015 to 2018. To quantify impacts emissions meteorology on concentration changes, performed a series air quality simulations with year-specific fixed anthropogenic inventory. The decreased at 9.1 4.3%/yr during study period, respectively. AODs Moderate Resolution Imaging...
Abstract. Nitrogen oxides (NOx≡ NO + NO2) are of central importance for air quality, climate forcing, and nitrogen deposition to ecosystems. The Geostationary Environment Monitoring Spectrometer (GEMS) is now providing hourly NO2 satellite observations over East Asia, offering the first direct measurements diurnal variation from space guide understanding NOx emissions chemistry. retrieval requires independent vertical profile information a chemical transport model (CTM) compute mass factor...
Since the Geostationary Ocean Color Imager (GOCI) was successfully launched in 2010, GOCI Yonsei aerosol retrieval (YAER) algorithm has been continuously updated to retrieve hourly optical properties. GOCI-II 4 more channels including UV, finer spatial resolution (250 m), and daily full disk coverage as compared GOCI, February 2020, onboard GEO-KOMPSAT-2B (GK-2B) satellite. In this study, we extended YAER data based on its improved performance many aspects present first results of properties...
Abstract. The Geostationary Environment Monitoring Spectrometer (GEMS) on board GEO-KOMPSAT-2B was launched in February 2020 and has been monitoring atmospheric chemical compositions over Asia. We present the first evaluation of operational GEMS formaldehyde (HCHO) vertical column densities (VCDs) during after in-orbit test (IOT) period (August–October 2020) by comparing them with products from TROPOspheric Instrument (TROPOMI) Fourier-transform infrared (FTIR) multi-axis differential...
Abstract. Nitrogen oxide radicals (NOx≡NO+NO2) emitted by fuel combustion are important precursors of ozone and particulate matter pollution, NO2 itself is harmful to public health. The Geostationary Environment Monitoring Spectrometer (GEMS), launched in space 2020, now provides hourly daytime observations columns over East Asia. This diurnal variation offers unique information on the emission chemistry NOx, but it needs be carefully interpreted. Here we investigate drivers observed GEMS...
Abstract. This paper introduces a cloud retrieval algorithm for the Geostationary Environmental Monitoring Spectrometer (GEMS), first environmental geostationary orbit satellite, and validates its products by comparing them with those produced other instruments (OMI, TROPOMI, AMI, CALIOP). The GEMS are corrected impact of clouds on atmospheric components using O2–O2 absorption band to retrieve effective fraction centroid pressure. performance was similar that OMI. We analyzed characteristics...