A027-02
First Retrieval of NO2 Diurnal Variation Using the Geostationary Environment Monitoring Spectrometer (GEMS) Over the Asia: A preliminary Results

Monday, 7 December 2020: 20:38
Virtual
Junsung Park1, Hyunkee Hong2, Hanlim Lee3, Jhoon Kim4 and Dongwon Lee2, (1)Pukyong National University, Busan, Korea, Republic of (South), (2)National Institute of Environmental Research, Environmental Satellite Center, Incheon, South Korea, (3)Pukyong National University, Busan, South Korea, (4)Yonsei University, Department of Atmospheric Sciences, Seoul, South Korea
Recorded Presentation
Abstract:
In this present study, we presents the operational Nitrogen dioxide (NO2) retrieval algorithm for Geostationary Environment Monitoring spectrometer (GEMS), a new Ultraviolet (UV) and Visible (VIS) hyper-spectral sensor, which provides hourly radiance over Asia and West Pacific Ocean at wavelengths range from 300 to 500 nm with FWHM (Full Width Half Maximum) of 0.6. The GEMS operational NO2 algorithm consists of total NO2 column retrieval and tropospheric column estimation. The NO2 Slant Column Densities (SCDs) are retrieved based on the Differential Optical Absorption Spectroscopy (DOAS) technique. Look-Up Table (LUT) based Air Mass Factor (AMF), which is calculated using the linearized pseudo-spherical scalar and vector discrete ordinate radiative transfer code (VLIDORT, version 2.6) with inputs of Weather Research and Forecasting model coupled with Chemistry (WRF-Chem) products, are used to covert the SCDs in to Vertical Column Densities (VCDs). The tropospheric NO2 column density is estimated using the Stratospheric and Tropospheric Separation (STS) method. We have carried out the first NO2 retrieval from the real GEMS measurement radiances. In addition, major source areas including metropolitan cities show the diurnal variations clearly.
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