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Global observations of tropospheric Bromine monoxide (BrO) columns from TROPOMI
Chen, Y.Y.; Liu, S.; Zhu, L.; Seo, S.; Richter, A.; Li, X.C.; Ding, A.; Sun, W.F.; Shu, L.; Wang, X.; Valks, P.; Hendrick, F.; Koenig, T.K.; Volkamer, R.; Bai, B.; Wang, D.K.; Pu, D.C.; Sun, S.; Li, J.; Zuo, X.X.; Fu, W.T.; Li, Y.L.; Zhang, P.; Yang, X.; Fu, T.M. (2023). Global observations of tropospheric Bromine monoxide (BrO) columns from TROPOMI. JGR: Atmospheres 128(24): e2023JD039091. https://dx.doi.org/10.1029/2023JD039091
In: Journal of Geophysical Research-Atmospheres. AMER GEOPHYSICAL UNION: Washington. ISSN 2169-897X; e-ISSN 2169-8996, more
Peer reviewed article  
Available in  Authors 
Author keywords
    TROPOMI; BrO; retrieval; GEOS-Chem
Authors  Top 
  • Chen, Y.Y.
  • Liu, S.
  • Zhu, L.
  • Seo, S.
  • Richter, A.
  • Li, X.C.
  • Ding, A.
  • Sun, W., more
  • Shu, L.
  • Wang, X.
  • Valks, P.
  • Hendrick, F., more
  • Koenig, T.K.
  • Volkamer, R.
  • Bai, B.
  • Wang, D.K.
  • Pu, D.C.
  • Sun, S.
  • Li, J.
  • Zuo, X.X.
  • Fu, W.T.
  • Li, Y.L.
  • Zhang, P.
  • Yang, X.
  • Fu, T.M.
Abstract

    Bromine monoxide (BrO) plays an important role in tropospheric chemistry. The state-of-the-science TROPOspheric Monitoring Instrument (TROPOMI) offers the potential to monitor atmospheric composition with a fine spatial resolution of up to 5.5 × 3.5 km2. We present here the retrieval of tropospheric BrO columns from TROPOMI. We implement a stratospheric correction scheme using a climatological approach based on the latest GEOS-Chem High Performance chemical transport model, and improve the tropospheric air mass factor calculation with TROPOMI surface albedo data accounting for the geometrical dependency. Our product presents a good level of consistency in comparison with measurements from ground-based zenith-sky differential optical absorption spectroscopy (r = 0.67), aircrafts (r = 0.46), and satellites (similar spatial distributions of BrO columns). Furthermore, our retrieval captures BrO enhancements in the polar springtime with values up to 7.8 × 1013 molecules cm−2 and identifies small-scale emission sources such as volcanoes and salt marshes. Based on TROPOMI data, we probe a blowing snow aerosol bromine mechanism in which the snow salinity is reduced to better match simulation and observation. Our TROPOMI tropospheric BrO product contributes high-resolution global information to studies investigating atmospheric bromine chemistry.

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