EGU22-3280, updated on 27 Mar 2022
https://doi.org/10.5194/egusphere-egu22-3280
EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

First results of diurnal NO2 column variation over Asia from the Geostationary Environment Monitoring Spectrometer (GEMS) 

Junsung Park1, Hanlim Lee1, Hyunkee Hong2, Jiwon Yang1, Michel van Roozendael3, Siwan Kim4, Jhoon Kim4,5, Dong-won Lee2, Caroline Fayt3, Dai ho Ko6, Seung-Hoon Lee6, Nickolay A. Krotkov7, Thomas Wagner8, Andreas Richter9, and Lok N. Lamsal7
Junsung Park et al.
  • 1Division of Earth Environmental System Science, Major of Spatial Information Engineering, Pukyong National University, Busan, Republic of Korea
  • 2National Institute of Environmental Research, Incheon, Republic of Korea
  • 3Belgian Institute for Space Aeronomy (BIRA-IASB), Brussels, Belgium
  • 4Department of Atmospheric Sciences, Yonsei University, Seoul, Republic of Korea
  • 5Particulate Matter Research Institute, Samsung Advanced Institute of Technology, Suwon, Republic of Korea
  • 6Korea Aerospace Research Institute, Daejeon, Republic of Korea
  • 7Atmospheric Chemistry and Dynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
  • 8Max-Planck Institute for Chemistry (MPI-C), Mainz, Germany
  • 9Institute of Environmental Physics (IUP-UB), University of Bremen, Bremen, Germany

Nitrogen dioxide (NO2) is generally emitted from the anthropogenic source such as fossil fuel combustion and natural sources such as lightning, forest fires, and soil emission. These NO2 have adverse effects on human health and are known to affect regional climate as a short lived climate forcer. In addition, it is a precursor of aerosol nitrate and plays a key role the photochemistry of tropospheric Ozone. Up to date, NO2 observation has been possible only once a day using low earth orbit satellite sensors such as GOME, SCIAMACHY, GEMS-2, OMI, OMPS, and TROPOMI. However, hourly NO2 monitoring is expected to provide better understanding of atmospheric chemistries and climate effects related with NOx in regional and global scales. From February, 2020, it is possible, for the first time, to observe the diurnal NO2 variations using Geostationary Environment Monitoring Spectrometer (GEMS). Here, we present first results of diurnal changes in total and tropospheric NO2 columns observed over Asia with high temporal and spatial resolutions using the GEMS operational NO2 algorithm. NIER of Ministry of Environment in South Korea plans to release the GEMS NO2 data in real-time. The GEMS operational NO2 algorithm based on DOAS technique and LUT based NO2 AMF to retrieve the total NO2 columns. We, in addition, retrieve the GEMS tropospheric NO2 columns by subtracting stratospheric NO2 columns from the total NO2 columns. The stratospheric NO2 columns are calculated from scaling stratospheric NO2 from SLIMCAT model using the real GEMS observation data over Pacific ocean. In this present study, we introduce diurnal characteristics at various major cities including, ports, and industrial regions. We also evaluate the performance of the GEMS NO2 retrieval algorithm by comparing GEMS NO2 columns and those observed from ground based Pandora at Seosan in South Korea and MAX-DOAS at Xianghe in China. The comparisons also are made between the total and tropospheric GEMS NO2 data and that of TROPOMI. The validation results show good agreements of GEMS data against those from others.

How to cite: Park, J., Lee, H., Hong, H., Yang, J., van Roozendael, M., Kim, S., Kim, J., Lee, D., Fayt, C., Ko, D. H., Lee, S.-H., A. Krotkov, N., Wagner, T., Richter, A., and N. Lamsal, L.: First results of diurnal NO2 column variation over Asia from the Geostationary Environment Monitoring Spectrometer (GEMS) , EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-3280, https://doi.org/10.5194/egusphere-egu22-3280, 2022.