Spectral aerosol extinction (SpEx): a new instrument for in situ ambient aerosol extinction measurements across the UV/visible wavelength range
We introduce a new instrument for the measurement of in situ ambient aerosol extinction over the 300–700 nm wavelength range, the spectral aerosol extinction (SpEx) instrument. This measurement capability is envisioned to complement existing in situ instrumentation, allowing for simultaneous measure...
| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2015-11-01
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| Series: | Atmospheric Measurement Techniques |
| Online Access: | http://www.atmos-meas-tech.net/8/4755/2015/amt-8-4755-2015.pdf |
| _version_ | 1819182189722468352 |
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| author | C. E. Jordan B. E. Anderson A. J. Beyersdorf C. A. Corr J. E. Dibb M. E. Greenslade R. F. Martin R. H. Moore E. Scheuer M. A. Shook K. L. Thornhill D. Troop E. L. Winstead L. D. Ziemba |
| author_facet | C. E. Jordan B. E. Anderson A. J. Beyersdorf C. A. Corr J. E. Dibb M. E. Greenslade R. F. Martin R. H. Moore E. Scheuer M. A. Shook K. L. Thornhill D. Troop E. L. Winstead L. D. Ziemba |
| author_sort | C. E. Jordan |
| collection | DOAJ |
| description | We introduce a new instrument for the measurement of in situ ambient aerosol
extinction over the 300–700 nm wavelength range, the spectral aerosol
extinction (SpEx) instrument. This measurement capability is envisioned to
complement existing in situ instrumentation, allowing for simultaneous
measurement of the evolution of aerosol optical, chemical, and physical
characteristics in the ambient environment. In this work, a detailed
description of the instrument is provided along with characterization tests
performed in the laboratory. Measured spectra of NO<sub>2</sub> and polystyrene
latex spheres (PSLs) agreed well with theoretical calculations. Good
agreement was also found with simultaneous aerosol extinction measurements at
450, 530, and 630 nm using CAPS PMex instruments in a series of 22 tests
including nonabsorbing compounds, dusts, soot, and black and brown carbon
analogs. SpEx measurements are expected to help identify the presence of
ambient brown carbon due to its 300 nm lower wavelength limit compared to
measurements limited to longer UV and visible wavelengths. Extinction spectra
obtained with SpEx contain more information than can be conveyed by a simple
power law fit (typically represented by Ångström exponents). Planned
future improvements aim to lower detection limits and ruggedize the
instrument for mobile operation. |
| first_indexed | 2024-12-22T22:42:11Z |
| format | Article |
| id | doaj.art-098d792cd6334b0b9f5729894a33d72d |
| institution | Directory Open Access Journal |
| issn | 1867-1381 1867-8548 |
| language | English |
| last_indexed | 2024-12-22T22:42:11Z |
| publishDate | 2015-11-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Measurement Techniques |
| spelling | doaj.art-098d792cd6334b0b9f5729894a33d72d2022-12-21T18:10:09ZengCopernicus PublicationsAtmospheric Measurement Techniques1867-13811867-85482015-11-018114755477110.5194/amt-8-4755-2015Spectral aerosol extinction (SpEx): a new instrument for in situ ambient aerosol extinction measurements across the UV/visible wavelength rangeC. E. Jordan0B. E. Anderson1A. J. Beyersdorf2C. A. Corr3J. E. Dibb4M. E. Greenslade5R. F. Martin6R. H. Moore7E. Scheuer8M. A. Shook9K. L. Thornhill10D. Troop11E. L. Winstead12L. D. Ziemba13Institute for the Study of Earth, Oceans, & Space, University of New Hampshire, Durham, NH, USANASA Langley Research Center, Hampton, VA, USANASA Langley Research Center, Hampton, VA, USANASA Langley Research Center, Hampton, VA, USAInstitute for the Study of Earth, Oceans, & Space, University of New Hampshire, Durham, NH, USADepartment of Chemistry, University of New Hampshire, Durham, NH, USANASA Langley Research Center, Hampton, VA, USANASA Langley Research Center, Hampton, VA, USAInstitute for the Study of Earth, Oceans, & Space, University of New Hampshire, Durham, NH, USANASA Langley Research Center, Hampton, VA, USANASA Langley Research Center, Hampton, VA, USASouthwest Research Institute, Durham, NH, USANASA Langley Research Center, Hampton, VA, USANASA Langley Research Center, Hampton, VA, USAWe introduce a new instrument for the measurement of in situ ambient aerosol extinction over the 300–700 nm wavelength range, the spectral aerosol extinction (SpEx) instrument. This measurement capability is envisioned to complement existing in situ instrumentation, allowing for simultaneous measurement of the evolution of aerosol optical, chemical, and physical characteristics in the ambient environment. In this work, a detailed description of the instrument is provided along with characterization tests performed in the laboratory. Measured spectra of NO<sub>2</sub> and polystyrene latex spheres (PSLs) agreed well with theoretical calculations. Good agreement was also found with simultaneous aerosol extinction measurements at 450, 530, and 630 nm using CAPS PMex instruments in a series of 22 tests including nonabsorbing compounds, dusts, soot, and black and brown carbon analogs. SpEx measurements are expected to help identify the presence of ambient brown carbon due to its 300 nm lower wavelength limit compared to measurements limited to longer UV and visible wavelengths. Extinction spectra obtained with SpEx contain more information than can be conveyed by a simple power law fit (typically represented by Ångström exponents). Planned future improvements aim to lower detection limits and ruggedize the instrument for mobile operation.http://www.atmos-meas-tech.net/8/4755/2015/amt-8-4755-2015.pdf |
| spellingShingle | C. E. Jordan B. E. Anderson A. J. Beyersdorf C. A. Corr J. E. Dibb M. E. Greenslade R. F. Martin R. H. Moore E. Scheuer M. A. Shook K. L. Thornhill D. Troop E. L. Winstead L. D. Ziemba Spectral aerosol extinction (SpEx): a new instrument for in situ ambient aerosol extinction measurements across the UV/visible wavelength range Atmospheric Measurement Techniques |
| title | Spectral aerosol extinction (SpEx): a new instrument for in situ ambient aerosol extinction measurements across the UV/visible wavelength range |
| title_full | Spectral aerosol extinction (SpEx): a new instrument for in situ ambient aerosol extinction measurements across the UV/visible wavelength range |
| title_fullStr | Spectral aerosol extinction (SpEx): a new instrument for in situ ambient aerosol extinction measurements across the UV/visible wavelength range |
| title_full_unstemmed | Spectral aerosol extinction (SpEx): a new instrument for in situ ambient aerosol extinction measurements across the UV/visible wavelength range |
| title_short | Spectral aerosol extinction (SpEx): a new instrument for in situ ambient aerosol extinction measurements across the UV/visible wavelength range |
| title_sort | spectral aerosol extinction spex a new instrument for in situ ambient aerosol extinction measurements across the uv visible wavelength range |
| url | http://www.atmos-meas-tech.net/8/4755/2015/amt-8-4755-2015.pdf |
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