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

Abstract

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 0.53

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
DOE Office of Science Atmospheric Radiation Measurement (ARM) Program (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
1333735
DOE Contract Number:  
AC05-7601830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Quantitative Spectroscopy and Radiative Transfer; Journal Volume: 176; Journal Issue: C
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; DOAS, oxygen collisional complex (O4), O4 correction factor (CFO4), aerosol extinction profiles, and elevated aerosol layers

Citation Formats

Ortega, Ivan, Berg, Larry K., Ferrare, Richard A., Hair, Johnathan W., Hostetler, Chris A., and Volkamer, Rainer. Elevated aerosol layers modify the O2–O2 absorption measured by ground-based MAX-DOAS. United States: N. p., 2016. Web. doi:10.1016/j.jqsrt.2016.02.021.
Ortega, Ivan, Berg, Larry K., Ferrare, Richard A., Hair, Johnathan W., Hostetler, Chris A., & Volkamer, Rainer. Elevated aerosol layers modify the O2–O2 absorption measured by ground-based MAX-DOAS. United States. doi:10.1016/j.jqsrt.2016.02.021.
Ortega, Ivan, Berg, Larry K., Ferrare, Richard A., Hair, Johnathan W., Hostetler, Chris A., and Volkamer, Rainer. Wed . "Elevated aerosol layers modify the O2–O2 absorption measured by ground-based MAX-DOAS". United States. doi:10.1016/j.jqsrt.2016.02.021. https://www.osti.gov/servlets/purl/1333735.
@article{osti_1333735,
title = {Elevated aerosol layers modify the O2–O2 absorption measured by ground-based MAX-DOAS},
author = {Ortega, Ivan and Berg, Larry K. and Ferrare, Richard A. and Hair, Johnathan W. and Hostetler, Chris A. and Volkamer, Rainer},
abstractNote = {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 0.53},
doi = {10.1016/j.jqsrt.2016.02.021},
journal = {Journal of Quantitative Spectroscopy and Radiative Transfer},
number = C,
volume = 176,
place = {United States},
year = {Wed Jun 01 00:00:00 EDT 2016},
month = {Wed Jun 01 00:00:00 EDT 2016}
}