Elevated aerosol layers modify the O2–O2 absorption measured by ground-based MAX-DOAS

Ortega, Ivan; Berg, Larry K.; Ferrare, Richard A.; Hair, Johnathan W.; Hostetler, Chris A.; Volkamer, Rainer

doi:10.1016/j.jqsrt.2016.02.021

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The NOAA IR serves as an archival repository of NOAA-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by NOAA or funded partners. As a repository, the NOAA IR retains documents in their original published format to ensure public access to scientific information.

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Elevated aerosol layers modify the O2–O2 absorption measured by ground-based MAX-DOAS

2016
By Ortega, Ivan ; Berg, Larry K. ; Ferrare, Richard A. ; ...
Source: Journal of Quantitative Spectroscopy and Radiative Transfer, 176, 34-49

[PDF-3.51 MB]

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Journal Title:

Journal of Quantitative Spectroscopy and Radiative Transfer
Personal Author:

Ortega, Ivan ; Berg, Larry K. ; Ferrare, Richard A. ; Hair, Johnathan W. ; Hostetler, Chris A. ; ... More +

Ortega, Ivan ; Berg, Larry K. ; Ferrare, Richard A. ; Hair, Johnathan W. ; Hostetler, Chris A. ; Volkamer, Rainer Less -
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CIRES (Cooperative Institute for Research in Environmental Sciences)
Description:

The oxygen collisional complex (O2–O2, or O4) is a greenhouse gas, and a calibration trace gas used to infer aerosol and cloud properties by Differential Optical Absorption Spectroscopy (DOAS). Recent reports suggest the need for an O4 correction factor (CFO4) when comparing simulated and measured O4 differential slant column densities (dSCD) by passive DOAS. We investigate the sensitivity of O4 dSCD simulations at ultraviolet (360 nm) and visible (477 nm) wavelengths towards separately measured aerosol extinction profiles. Measurements were conducted by the University of Colorado 2D-MAX-DOAS instrument and NASA׳s multispectral High Spectral Resolution Lidar (HSRL-2) during the Two Column Aerosol Project (TCAP) at Cape Cod, MA in July 2012. During two case study days with (1) high aerosol load (17 July, AOD~0.35 at 477 nm), and (2) near molecular scattering conditions (22 July, AOD<0.10 at 477 nm) the measured and calculated O4 dSCDs agreed within 6.4±0.4% (360 nm) and 4.7±0.6% (477 nm) if the HSRL-2 profiles were used as input to the calculations. However, if in the calculations the aerosol is confined to the surface layer (while keeping AOD constant) we find 0.53More ▼ -->
Source:

Journal of Quantitative Spectroscopy and Radiative Transfer, 176, 34-49
DOI:

https://doi.org/10.1016/j.jqsrt.2016.02.021
ISSN:

0022-4073
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pdf
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Elsevier BV
Document Type:

Journal Article
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https://creativecommons.org/licenses/by-nc-nd/4.0/
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CC BY-NC-ND
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urn:sha-512:538f7da35f47b7c9247827695f2961938d646ffa8092648f85d0a1e3139e28788165880084598023825271bd8d366bc9e34b49051802af12606727513327b948
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Elevated aerosol layers modify the O2–O2 absorption measured by ground-based MAX-DOAS

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