Source and variability of formaldehyde (HCHO) at northern high latitude: an integrated satellite, aircraft, and model study

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dc.contributor.authorZhao, Tianlang
dc.contributor.authorMao, Jingqiu
dc.contributor.authorSimpson, William R.
dc.contributor.authorSmedt, Isabelle De
dc.contributor.authorZhu, Lei
dc.contributor.authorHanisco, Thomas F.
dc.contributor.authorWolfe, Glenn
dc.contributor.authorClair, Jason St.
dc.contributor.authorAbad, Gonzalo González
dc.contributor.authorNowlan, Caroline R.
dc.contributor.authorBarletta, Barbara
dc.contributor.authorMeinardi, Simone
dc.contributor.authorBlake, Donald R.
dc.contributor.authorApel, Eric C.
dc.contributor.authorHornbrook, Rebecca S.
dc.date.accessioned2021-11-05T17:01:12Z
dc.date.available2021-11-05T17:01:12Z
dc.date.issued2022-06-03
dc.description.abstractHere we use satellite observations of HCHO vertical column densities (VCD) from the TROPOspheric Monitoring Instrument (TROPOMI), ground-based and aircraft measurements, combined with a nested regional chemical transport model (GEOS-Chem at 0.5° × 0.625° resolution), to understand the variability and sources of summertime HCHO better in Alaska. We first evaluate GEOS-Chem with in-situ airborne measurements during Atmospheric Tomography Mission 1 (ATom-1) aircraft campaign and ground-based measurements from Multi-AXis Differential Optical Absorption Spectroscopy (MAX-DOAS). We show reasonable agreement between observed and modeled HCHO, isoprene and monoterpenes. In particular, HCHO profiles show spatial homogeneity in Alaska, suggesting a minor contribution of biogenic emissions to HCHO VCD. We further examine the TROPOMI HCHO product in Alaska during boreal summer, which is in good agreement with GEOS-Chem model results. We find that HCHO VCDs are dominated by free-tropospheric background in wildfire-free regions. During the summer of 2018, the model suggests that the background HCHO column, resulting from methane oxidation, contributes to 66–80 % of the HCHO VCD, while wildfires contribute to 14 % and biogenic VOC contributes to 5–9 % respectively. For the summer of 2019, which had intense wildfires, the model suggests that wildfires contribute to 40 to 65 %, and the background column accounts for 30 to 50 % of HCHO VCD in June and July. In particular, the model indicates a major contribution of wildfires from direct emissions of HCHO, instead of secondary production of HCHO from oxidation of larger VOCs. We find that the column contributed by biogenic VOC is often small and below the TROPOMI detection limit. The source and variability of HCHO VCD above Alaska during summer is mainly driven by background methane oxidation and wildfires. This work discusses challenges for quantifying HCHO and its precursors in remote pristine regions.en_US
dc.description.sponsorshipT.Z., J. M. and W.R.S. acknowledge funding from NASA 80NSSC19M0154. We thank Dylan Millet, Xiaoyi Zhao for helpful discussions.en_US
dc.description.urihttps://acp.copernicus.org/articles/22/7163/2022/en_US
dc.format.extent2 filesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2h5hv-fvod
dc.identifier.citationZhao, T., Mao, J., Simpson, W. R., De Smedt, I., Zhu, L., Hanisco, T. F., Wolfe, G. M., St. Clair, J. M., González Abad, G., Nowlan, C. R., Barletta, B., Meinardi, S., Blake, D. R., Apel, E. C., and Hornbrook, R. S.: Source and variability of formaldehyde (HCHO) at northern high latitudes: an integrated satellite, aircraft, and model study, Atmos. Chem. Phys., 22, 7163–7178, https://doi.org/10.5194/acp-22-7163-2022, 2022.en_US
dc.identifier.urihttps://doi.org/10.5194/acp-22-7163-2022
dc.identifier.urihttp://hdl.handle.net/11603/23240
dc.language.isoen_USen_US
dc.publisherCopernicus Publicationsen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Joint Center for Earth Systems Technology
dc.relation.ispartofUMBC Physics Department
dc.relation.ispartofUMBC Faculty Collection
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.en_US
dc.rightsPublic Domain Mark 1.0*
dc.rightsThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/*
dc.titleSource and variability of formaldehyde (HCHO) at northern high latitude: an integrated satellite, aircraft, and model studyen_US
dc.typeTexten_US
dcterms.creatorhttps://orcid.org/0000-0001-6586-4043en_US
dcterms.creatorhttps://orcid.org/0000-0002-9367-5749en_US

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