GEMS BrO Retrieval Sensitivity Test Using a Radiative Transfer Model

Heesung Chong, Jhoon Kim, Ukkyo Jeong, Sang Seo Park, Jaemin Hong, Dha Hyun Ahn, Hyeji Cha, Won Jin Lee, Hae Jung Lee

Research output: Contribution to journalArticlepeer-review


To estimate errors in GEMS retrievals for bromine monoxide (BrO) total vertical column densities (VCDs), we perform a sensitivity test using synthetic spectra generated by a radiative transfer model. Hourly synthetic data are produced for 00-07 UTC on the first day of every month in Jul 2013- Jun 2014. Solution errors estimated by the optimal estimation method tend to decrease with increasing air mass factors (AMFs) but increase when AMFs are larger than 5. Interference errors induced by formaldehyde (HCHO) absorption appear to be larger with smaller BrO AMFs. Total BrO retrieval errors estimated by combining solution and interference errors show an average of 26.74±30.18% for all data samples and 60.39±133.78% for those with solar zenith angles higher than 80°. Due to interfering spectral features and measurement errors not considered in this study, errors in BrO retrievals from actual GEMS measurements may have different magnitudes from our estimates. However, the variability of errors assessed in this study is still expected to appear in the actual BrO retrievals.

Original languageEnglish
Pages (from-to)1491-1506
Number of pages16
JournalKorean Journal of Remote Sensing
Issue number1-6
Publication statusPublished - 2021

Bibliographical note

Publisher Copyright:
© 2021 Korean Society of Remote Sensing. All Rights Reserved.

All Science Journal Classification (ASJC) codes

  • Computers in Earth Sciences
  • Earth and Planetary Sciences (miscellaneous)
  • Engineering (miscellaneous)


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