Towards a satellite formaldehyde – in situ hybrid estimate for organic aerosol abundance
| dc.contributor.author | Liao, Jin | |
| dc.contributor.author | Hanisco, Thomas F. | |
| dc.contributor.author | Wolfe, Glenn M. | |
| dc.contributor.author | St. Clair, Jason | |
| dc.contributor.author | Jimenez, Jose L. | |
| dc.contributor.author | Campuzano-Jost, Pedro | |
| dc.contributor.author | Nault, Benjamin A. | |
| dc.contributor.author | Fried, Alan | |
| dc.contributor.author | Marais, Eloise A. | |
| dc.contributor.author | Abad, Gonzalo González | |
| dc.contributor.author | Chance, Kelly | |
| dc.contributor.author | Jethva, Hiren T. | |
| dc.contributor.author | Ryerson, Thomas B. | |
| dc.contributor.author | Warneke, Carsten | |
| dc.contributor.author | Wisthaler, Armin | |
| dc.date.accessioned | 2020-09-22T15:13:11Z | |
| dc.date.available | 2020-09-22T15:13:11Z | |
| dc.date.issued | 2019-03-04 | |
| dc.description.abstract | Organic aerosol (OA) is one of the main components of the global particulate burden and intimately links natural and anthropogenic emissions with air quality and climate. It is challenging to accurately represent OA in global models. Direct quantification of global OA abundance is not possible with current remote sensing technology; however, it may be possible to exploit correlations of OA with remotely observable quantities to infer OA spatiotemporal distributions. In particular, formaldehyde (HCHO) and OA share common sources via both primary emissions and secondary production from oxidation of volatile organic compounds (VOCs). Here, we examine OA–HCHO correlations using data from summertime airborne campaigns investigating biogenic (NASA SEAC4RS and DC3), biomass burning (NASA SEAC4RS), and anthropogenic conditions (NOAA CalNex and NASA KORUS-AQ). In situ OA correlates well with HCHO (r=0.59–0.97), and the slope and intercept of this relationship depend on the chemical regime. For biogenic and anthropogenic regions, the OA–HCHO slopes are higher in low NOx conditions, because HCHO yields are lower and aerosol yields are likely higher. The OA–HCHO slope of wildfires is over 9 times higher than that for biogenic and anthropogenic sources. The OA–HCHO slope is higher for highly polluted anthropogenic sources (e.g., KORUS-AQ) than less polluted (e.g., CalNex) anthropogenic sources. Near-surface OAs over the continental US are estimated by combining the observed in situ relationships with HCHO column retrievals from NASA's Ozone Monitoring Instrument (OMI). HCHO vertical profiles used in OA estimates are from climatology a priori profiles in the OMI HCHO retrieval or output of specific period from a newer version of GEOS-Chem. Our OA estimates compare well with US EPA IMPROVE data obtained over summer months (e.g., slope =0.60–0.62, r=0.56 for August 2013), with correlation performance comparable to intensively validated GEOS-Chem (e.g., slope =0.57, r=0.56) with IMPROVE OA and superior to the satellite-derived total aerosol extinction (r=0.41) with IMPROVE OA. This indicates that OA estimates are not very sensitive to these HCHO vertical profiles and that a priori profiles from OMI HCHO retrieval have a similar performance to that of the newer model version in estimating OA. Improving the detection limit of satellite HCHO and expanding in situ airborne HCHO and OA coverage in future missions will improve the quality and spatiotemporal coverage of our OA estimates, potentially enabling constraints on global OA distribution. | en_US |
| dc.description.sponsorship | Jin Liao, Thomas F. Hanisco, Glenn M. Wolfe, and Jason St. Clair were supported by NASA grants NNH15ZDA001N and NNH10ZDA001N. Benjamin A. Nault, Pedro Campuzano-Jost, and Jose L. Jimenez were supported by NASA grants NNX15AT96G and 80NSSC18K0630. Armin Wisthaler and PTR-MS measurements during DC3, SEAC4RS, and KORUS-AQ were supported by the Austrian Federal Ministry for Transport, Innovation and Technology (bmvit) through the Austrian Space Applications Programme (ASAP) of the Austrian Research Promotion Agency (FFG). The PTR-MS instrument team (Philipp Eichler, Lisa Kaiser, Tomas Mikoviny, and Markus Müller) is acknowledged for their field support. We thank Eric Edgerton for providing the SEARCH network data. | en_US |
| dc.description.uri | https://acp.copernicus.org/articles/19/2765/2019/ | en_US |
| dc.format.extent | 21 pages | en_US |
| dc.genre | journal articles | en_US |
| dc.identifier | doi:10.13016/m2yf2q-pueh | |
| dc.identifier.citation | Liao, J., Hanisco, T. F., Wolfe, G. M., St. Clair, J., Jimenez, J. L., Campuzano-Jost, P., Nault, B. A., Fried, A., Marais, E. A., Gonzalez Abad, G., Chance, K., Jethva, H. T., Ryerson, T. B., Warneke, C., and Wisthaler, A.: Towards a satellite formaldehyde – in situ hybrid estimate for organic aerosol abundance, Atmos. Chem. Phys., 19, 2765–2785, https://doi.org/10.5194/acp-19-2765-2019 | en_US |
| dc.identifier.uri | https://doi.org/10.5194/acp-19-2765-2019 | |
| dc.identifier.uri | http://hdl.handle.net/11603/19704 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | Copernicus Publications | en_US |
| dc.relation.isAvailableAt | The University of Maryland, Baltimore County (UMBC) | |
| dc.relation.ispartof | UMBC Joint Center for Earth Systems Technology | |
| dc.relation.ispartof | UMBC Faculty Collection | |
| dc.rights | This 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. | |
| dc.rights | Public Domain Mark 1.0 | * |
| dc.rights | This 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.uri | http://creativecommons.org/publicdomain/mark/1.0/ | * |
| dc.title | Towards a satellite formaldehyde – in situ hybrid estimate for organic aerosol abundance | en_US |
| dc.type | Text | en_US |