Myoung‐Hwan Ahn
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View article: Sub‐Footprint Spatial Inhomogeneity Effect on Geostationary Hyperspectral Infrared Sounder Radiance Simulation
Sub‐Footprint Spatial Inhomogeneity Effect on Geostationary Hyperspectral Infrared Sounder Radiance Simulation Open
Hyperspectral infrared (IR) sounders onboard the geostationary satellites have revolutionized our understanding of Earth's atmosphere by providing detailed measurements of temperature, moisture, and trace gases with high temporal resolutio…
View article: Intercomparison of Geostationary Environment Monitoring Spectrometer (GEMS) observations during the ASIA-AQ Field Campaign
Intercomparison of Geostationary Environment Monitoring Spectrometer (GEMS) observations during the ASIA-AQ Field Campaign Open
The Airborne and Satellite Investigation of Asian Air Quality (ASIA-AQ) campaign took place in February and March 2024 as part of a global initiative to collect detailed atmospheric data across various locations in Asia. This campaign util…
View article: A Sound of Relief or a Sound of Panic: A Case Report on Female Urethral Sounding
A Sound of Relief or a Sound of Panic: A Case Report on Female Urethral Sounding Open
Medical urethral sounding is a common practice used to dilate the urethra. However, recreational practice comes with additional risks and perceived social stigma. This article describes a case of a middle-aged female patient inserting a 12…
View article: Application of deep learning in cloud cover prediction using geostationary satellite images
Application of deep learning in cloud cover prediction using geostationary satellite images Open
Predicting cloud cover is essential in fields, such as agriculture, climatology, and meteorology, where accurate weather forecasting can significantly impact decision-making. Traditional methods for cloud cover prediction encounter signifi…
View article: Influence of Atmospheric Slant Path on Geostationary Hyperspectral Infrared Sounder Radiance Simulations
Influence of Atmospheric Slant Path on Geostationary Hyperspectral Infrared Sounder Radiance Simulations Open
Accurately simulating a geostationary hyperspectral infrared sounder is critical for quantitative applications. Traditional radiation simulations of such instruments often overlook the influence of slant observation geometry by using verti…
View article: Advantages of Inter‐Calibration for Geostationary Satellite Sensors Onboard Twin Satellites
Advantages of Inter‐Calibration for Geostationary Satellite Sensors Onboard Twin Satellites Open
To address the increasing demand for diurnal information on trace gases and aerosols, a series of geostationary (GEO) satellite programs called GEO‐constellation have been initiated, with the launch of the Geostationary Environment Monitor…
View article: First evaluation of the GEMS formaldehyde product against TROPOMI and ground-based column measurements during the in-orbit test period
First evaluation of the GEMS formaldehyde product against TROPOMI and ground-based column measurements during the in-orbit test period Open
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 the operational GEMS…
View article: Advantages of Inter-calibration for Geostationary Satellite Sensors onboard Twin Satellites
Advantages of Inter-calibration for Geostationary Satellite Sensors onboard Twin Satellites Open
To address the increasing demand for diurnal information on trace gases and aerosols, a series of geostationary (GEO) satellite programs called GEO-constellation have been initiated, with the launch of the Geostationary Environment Monitor…
View article: Evaluation of inter-calibration approaches for the GEMS Level 1B product
Evaluation of inter-calibration approaches for the GEMS Level 1B product Open
To meet the growing demand for diurnal information on trace gases and aerosols in the atmosphere, a series of satellite programs consisting of the GEO-ring (GEO-constellation) has been initiated. The series started off with the launch of t…
View article: Significance of Various Sensing Mechanisms for Detecting Local and Atmospheric Greenhouse Gases: A Review (Adv. Sensor Res. 2/2024)
Significance of Various Sensing Mechanisms for Detecting Local and Atmospheric Greenhouse Gases: A Review (Adv. Sensor Res. 2/2024) Open
In article 2300094, Nicole Bassous, Young Suk Oh, Su Ryon Shin, and co-workers highlight the importance of low-cost sensors and sensor materials in detecting (city-wide) rising levels of GHGs that will aid to curb their adverse effects on …
View article: Comment on egusphere-2023-1918
Comment on egusphere-2023-1918 Open
Abstract. The Geostationary Environment Monitoring Spectrometer (GEMS) onboard GEO-KOMPSAT 2B was successfully launched in February 2020 and has monitored Asia. We present the first evaluation of the operational GEMS formaldehyde (HCHO) ve…
View article: Comment on egusphere-2023-1918
Comment on egusphere-2023-1918 Open
Abstract. The Geostationary Environment Monitoring Spectrometer (GEMS) onboard GEO-KOMPSAT 2B was successfully launched in February 2020 and has monitored Asia. We present the first evaluation of the operational GEMS formaldehyde (HCHO) ve…
View article: First evaluation of the GEMS formaldehyde retrieval algorithm against TROPOMI and ground-based column measurements during the in-orbit test period
First evaluation of the GEMS formaldehyde retrieval algorithm against TROPOMI and ground-based column measurements during the in-orbit test period Open
The Geostationary Environment Monitoring Spectrometer (GEMS) onboard GEO-KOMPSAT 2B was successfully launched in February 2020 and has monitored Asia. We present the first evaluation of the operational GEMS formaldehyde (HCHO) vertical col…
View article: Supplementary material to "First evaluation of the GEMS formaldehyde retrieval algorithm against TROPOMI and ground-based column measurements during the in-orbit test period"
Supplementary material to "First evaluation of the GEMS formaldehyde retrieval algorithm against TROPOMI and ground-based column measurements during the in-orbit test period" Open
Table S1.Summary of the data field variables archived in GEMS Level 2 HCHO product.Layer, spatial, and image represent the number of vertical layers of the a priori profile, cross-track, and along-track of the GEMS observation.
View article: A New Approach for Better Assimilation of Microwave Sounding Data over Winter Sea Ice in the Korean Integrated Model
A New Approach for Better Assimilation of Microwave Sounding Data over Winter Sea Ice in the Korean Integrated Model Open
This paper proposes a pre-processing method for the assimilation of microwave satellite observations over winter sea ice into a numerical weather prediction system.
View article: A New Approach for Better Assimilation of Microwave Sounding Data over Winter Sea Ice in the Korean Integrated Model
A New Approach for Better Assimilation of Microwave Sounding Data over Winter Sea Ice in the Korean Integrated Model Open
This paper proposes a pre-processing method for the assimilation of microwave satellite observations over winter sea ice into a numerical weather prediction system.
View article: A New Bias Correction Approach for Better Assimilation of Microwave Sounding Data Over Winter Sea Ice in the Korean Integrated Model
A New Bias Correction Approach for Better Assimilation of Microwave Sounding Data Over Winter Sea Ice in the Korean Integrated Model Open
Microwave sounder observations are essential for numerical weather prediction (NWP) systems, but utilizing channels sensitive to surface over sea ice has been challenging due to difficulties in estimating the sea ice surface radiance.This …
View article: The First 30 Years of GEWEX
The First 30 Years of GEWEX Open
The Global Energy and Water Cycle Exchanges (GEWEX) project was created more than 30 years ago within the framework of the World Climate Research Programme (WCRP). The aim of this initiative was to address major gaps in our understanding o…
View article: Estimation of planetary boundary layer height (PBLH) from profile data at Bosung site
Estimation of planetary boundary layer height (PBLH) from profile data at Bosung site Open
<p>The planetary boundary layer (PBL) is the lowest part of the atmosphere and it is directly influenced by its contact with a planetary surface and the PBL height (PBLH) varies with time, season and topography. In this study, PBLH i…
View article: Comment on amt-2022-37
Comment on amt-2022-37 Open
Earth radiance in the form of hyperspectral data contains useful information on atmospheric constituents and aerosol properties. The Geostationary Environment Monitoring Spectrometer (GEMS) is an environmental sensor measuring such hypersp…
View article: Incremental Learning with Neural Network Algorithm for the Monitoring Pre-Convective Environments Using Geostationary Imager
Incremental Learning with Neural Network Algorithm for the Monitoring Pre-Convective Environments Using Geostationary Imager Open
Early warning of severe weather caused by intense convective weather systems is challenging. To help such activities, meteorological satellites with high temporal and spatial resolution have been utilized for the monitoring of instability …
View article: Characterization of the in-flight spectral response function of Geostationary Environment Monitoring Spectrometer (GEMS) retrieved using observed solar irradiance
Characterization of the in-flight spectral response function of Geostationary Environment Monitoring Spectrometer (GEMS) retrieved using observed solar irradiance Open
<p>The successful launch of Geostationary Environment Monitoring Spectrometer (GEMS) onboard the Geostationary Korea Multipurpose Satellite 2B (GK-2B) opens up a new possibility to provide daily air quality information for trace gase…
View article: Inter-comparison of wind vectors derived from geostationary satellites with the Aeolus/ALADIN
Inter-comparison of wind vectors derived from geostationary satellites with the Aeolus/ALADIN Open
<p>Wind information obtained from various means &#8203;&#8203;play an important role in data assimilation of numerical weather prediction. Atmospheric Motion Vector (AMV) obtained from the geostationary satellites provide a h…
View article: Characterization of GEMS level 1B based on inter-comparison using the visible channel of AMI
Characterization of GEMS level 1B based on inter-comparison using the visible channel of AMI Open
<p>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; The Geostationary Korean Multi-Purpose Satellite (GK-2) program consisting of GK-2A and GK-2B provides consis…
View article: Spectral Calibration Algorithm for the Geostationary Environment Monitoring Spectrometer (GEMS)
Spectral Calibration Algorithm for the Geostationary Environment Monitoring Spectrometer (GEMS) Open
The Geostationary Environment Monitoring Spectrometer (GEMS) onboard the Geostationary Korean Multi-Purpose Satellite 2B was successfully launched in February 2020. GEMS is a hyperspectral spectrometer measuring solar irradiance and Earth …
View article: Spectral Calibration Algorithm for the Geostationary Environment Monitoring Spectrometer (GEMS)
Spectral Calibration Algorithm for the Geostationary Environment Monitoring Spectrometer (GEMS) Open
The Geostationary Environment Monitoring Spectrometer (GEMS) onboard the Geostationary Korean Multi-Purpose Satellite 2B was successfully launched in February 2020. GEMS is a hyperspectral spectrometer measuring solar irradiance and Earth …