An evaluation of biomass burning aerosol mass, extinction, and size distribution in GEOS using observations from CAMP<sup>2</sup>Ex
<p>Biomass burning aerosol impacts aspects of the atmosphere and Earth system through direct and semi-direct effects, as well as influencing air quality. Despite its importance, the representation of biomass burning aerosol is not always accurate in numerical weather prediction and climate mo...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2022-12-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://acp.copernicus.org/articles/22/16091/2022/acp-22-16091-2022.pdf |
| _version_ | 1797979395323854848 |
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| author | A. B. M. Collow A. B. M. Collow V. Buchard V. Buchard P. R. Colarco A. M. da Silva R. Govindaraju R. Govindaraju E. P. Nowottnick S. Burton R. Ferrare C. Hostetler L. Ziemba |
| author_facet | A. B. M. Collow A. B. M. Collow V. Buchard V. Buchard P. R. Colarco A. M. da Silva R. Govindaraju R. Govindaraju E. P. Nowottnick S. Burton R. Ferrare C. Hostetler L. Ziemba |
| author_sort | A. B. M. Collow |
| collection | DOAJ |
| description | <p>Biomass burning aerosol impacts aspects of the atmosphere and
Earth system through direct and semi-direct effects, as well as
influencing air quality. Despite its importance, the representation of
biomass burning aerosol is not always accurate in numerical weather
prediction and climate models or reanalysis products. Using observations
collected as part of the Cloud, Aerosol and Monsoon Processes Philippines
Experiment (CAMP<span class="inline-formula"><sup>2</sup></span>Ex) in August through October of 2019, aerosol
concentration and optical properties are evaluated within the Goddard Earth
Observing System (GEOS) and its underlying aerosol module, GOCART. In the
operational configuration, GEOS assimilates aerosol optical depth
observations at 550 nm from AERONET and MODIS to constrain aerosol fields.
Particularly for biomass burning aerosol, without the assimilation of
aerosol optical depth, aerosol extinction is underestimated compared to
observations collected in the Philippines region during the CAMP<span class="inline-formula"><sup>2</sup></span>Ex
campaign. The assimilation process adds excessive amounts of carbon to
account for the underestimated extinction, resulting in positive biases in
the mass of black and organic carbon, especially within the boundary layer,
relative to in situ observations from the Langley Aerosol Research Group
Experiment. Counteracting this, GEOS is deficient in sulfate and nitrate
aerosol just above the boundary layer. Aerosol extinction within GEOS is a
function of the mass of different aerosol species, the ambient relative
humidity, the assumed spectral optical properties, and particle size
distribution per species. The relationship between dry and ambient
extinction in GEOS reveals that hygroscopic growth is too high within the
model for biomass burning aerosol. An additional concern lies in the assumed particle size distribution for GEOS, which has a single mode radius that is too small for organic carbon. Variability in the observed particle size distribution for biomass burning aerosol within a single flight also
illuminates the fact that a single assumed particle size distribution is not sufficient and that for a proper representation, a more advanced aerosol module within GEOS may be necessary.</p> |
| first_indexed | 2024-04-11T05:38:19Z |
| format | Article |
| id | doaj.art-adad619e31d44678ab5c41c7ba77c41a |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-04-11T05:38:19Z |
| publishDate | 2022-12-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-adad619e31d44678ab5c41c7ba77c41a2022-12-22T10:08:07ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242022-12-0122160911610910.5194/acp-22-16091-2022An evaluation of biomass burning aerosol mass, extinction, and size distribution in GEOS using observations from CAMP<sup>2</sup>ExA. B. M. Collow0A. B. M. Collow1V. Buchard2V. Buchard3P. R. Colarco4A. M. da Silva5R. Govindaraju6R. Govindaraju7E. P. Nowottnick8S. Burton9R. Ferrare10C. Hostetler11L. Ziemba12GESTAR II, University of Maryland Baltimore County, Baltimore, Maryland, USANASA Goddard Space Flight Center, Greenbelt, Maryland, USAGESTAR II, University of Maryland Baltimore County, Baltimore, Maryland, USANASA Goddard Space Flight Center, Greenbelt, Maryland, USANASA Goddard Space Flight Center, Greenbelt, Maryland, USANASA Goddard Space Flight Center, Greenbelt, Maryland, USANASA Goddard Space Flight Center, Greenbelt, Maryland, USAScience Systems and Applications, Inc., Lanham, Maryland, USANASA Goddard Space Flight Center, Greenbelt, Maryland, USANASA Langley Research Center, Hampton, Virginia, USANASA Langley Research Center, Hampton, Virginia, USANASA Langley Research Center, Hampton, Virginia, USANASA Langley Research Center, Hampton, Virginia, USA<p>Biomass burning aerosol impacts aspects of the atmosphere and Earth system through direct and semi-direct effects, as well as influencing air quality. Despite its importance, the representation of biomass burning aerosol is not always accurate in numerical weather prediction and climate models or reanalysis products. Using observations collected as part of the Cloud, Aerosol and Monsoon Processes Philippines Experiment (CAMP<span class="inline-formula"><sup>2</sup></span>Ex) in August through October of 2019, aerosol concentration and optical properties are evaluated within the Goddard Earth Observing System (GEOS) and its underlying aerosol module, GOCART. In the operational configuration, GEOS assimilates aerosol optical depth observations at 550 nm from AERONET and MODIS to constrain aerosol fields. Particularly for biomass burning aerosol, without the assimilation of aerosol optical depth, aerosol extinction is underestimated compared to observations collected in the Philippines region during the CAMP<span class="inline-formula"><sup>2</sup></span>Ex campaign. The assimilation process adds excessive amounts of carbon to account for the underestimated extinction, resulting in positive biases in the mass of black and organic carbon, especially within the boundary layer, relative to in situ observations from the Langley Aerosol Research Group Experiment. Counteracting this, GEOS is deficient in sulfate and nitrate aerosol just above the boundary layer. Aerosol extinction within GEOS is a function of the mass of different aerosol species, the ambient relative humidity, the assumed spectral optical properties, and particle size distribution per species. The relationship between dry and ambient extinction in GEOS reveals that hygroscopic growth is too high within the model for biomass burning aerosol. An additional concern lies in the assumed particle size distribution for GEOS, which has a single mode radius that is too small for organic carbon. Variability in the observed particle size distribution for biomass burning aerosol within a single flight also illuminates the fact that a single assumed particle size distribution is not sufficient and that for a proper representation, a more advanced aerosol module within GEOS may be necessary.</p>https://acp.copernicus.org/articles/22/16091/2022/acp-22-16091-2022.pdf |
| spellingShingle | A. B. M. Collow A. B. M. Collow V. Buchard V. Buchard P. R. Colarco A. M. da Silva R. Govindaraju R. Govindaraju E. P. Nowottnick S. Burton R. Ferrare C. Hostetler L. Ziemba An evaluation of biomass burning aerosol mass, extinction, and size distribution in GEOS using observations from CAMP<sup>2</sup>Ex Atmospheric Chemistry and Physics |
| title | An evaluation of biomass burning aerosol mass, extinction, and size distribution in GEOS using observations from CAMP<sup>2</sup>Ex |
| title_full | An evaluation of biomass burning aerosol mass, extinction, and size distribution in GEOS using observations from CAMP<sup>2</sup>Ex |
| title_fullStr | An evaluation of biomass burning aerosol mass, extinction, and size distribution in GEOS using observations from CAMP<sup>2</sup>Ex |
| title_full_unstemmed | An evaluation of biomass burning aerosol mass, extinction, and size distribution in GEOS using observations from CAMP<sup>2</sup>Ex |
| title_short | An evaluation of biomass burning aerosol mass, extinction, and size distribution in GEOS using observations from CAMP<sup>2</sup>Ex |
| title_sort | evaluation of biomass burning aerosol mass extinction and size distribution in geos using observations from camp sup 2 sup ex |
| url | https://acp.copernicus.org/articles/22/16091/2022/acp-22-16091-2022.pdf |
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