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Title: Intercomparison of biomass burning aerosol optical properties from in situ and remote-sensing instruments in ORACLES-2016

Abstract

The total effect of aerosols, both directly and on cloud properties, remains the biggest source of uncertainty in anthropogenic radiative forcing on the climate. Correct characterization of intensive aerosol optical properties, particularly in conditions where absorbing aerosol is present, is a crucial factor in quantifying these effects. The southeast Atlantic Ocean (SEA), with seasonal biomass burning smoke plumes overlying and mixing with a persistent stratocumulus cloud deck, offers an excellent natural laboratory to make the observations necessary to understand the complexities of aerosol–cloud–radiation interactions. The first field deployment of the NASA ORACLES (ObseRvations of Aerosols above CLouds and their intEractionS) campaign was conducted in September of 2016 out of Walvis Bay, Namibia. Data collected during ORACLES-2016 are used to derive aerosol properties from an unprecedented number of simultaneous measurement techniques over this region. Here, we present results from six of the eight independent instruments or instrument combinations, all applied to measure or retrieve aerosol absorption and single-scattering albedo. Most but not all of the biomass burning aerosol was located in the free troposphere, in relative humidities typically ranging up to 60%. We present the single-scattering albedo (SSA), absorbing and total aerosol optical depth (AAOD and AOD), and absorption, scattering, andmore » extinction Ångström exponents (AAE, SAE, and EAE, respectively) for specific case studies looking at near-coincident and near-colocated measurements from multiple instruments, and SSAs for the broader campaign average over the month-long deployment. For the case studies, we find that SSA agrees within the measurement uncertainties between multiple instruments, though, over all cases, there is no strong correlation between values reported by one instrument and another. We also find that agreement between the instruments is more robust at higher aerosol loading (AOD400 > 0.4).The campaign-wide average and range shows differences in the values measured by each instrument. We find the ORACLES-2016 campaign-average SSA at 500 > nm (SSA500) to be between 0.85 and 0.88, depending on the instrument considered (4STAR, AirMSPI, or in situ measurements), with the interquartile ranges for all instruments between 0.83 and 0.89. This is consistent with previous September values reported over the region (between 0.84 and 0.90 for SSA at 550nm). The results suggest that the differences observed in the campaign-average values may be dominated by instrument-specific spatial sampling differences and the natural physical variability in aerosol conditions over the SEA, rather than fundamental methodological differences.« less

Authors:
ORCiD logo [1];  [2];  [3]; ORCiD logo [4];  [5];  [6];  [7];  [5];  [8]; ORCiD logo [9];  [9];  [10]; ORCiD logo [1]; ORCiD logo [5]; ORCiD logo [7]; ORCiD logo [11];  [1];  [12]; ORCiD logo [5]; ORCiD logo [13] more »;  [14];  [14] « less
+ Show Author Affiliations
  1. Bay Area Environmental Research Inst., Moffett Field, CA (United States); NASA Ames Research Center (ARC), Moffett Field, Mountain View, CA (United States)
  2. Univ. of Oklahoma, Norman, OK (United States)
  3. Univ. of Washington, Seattle, WA (United States)
  4. Univ. of Miami, FL (United States)
  5. NASA Langley Research Center, Hampton, VA (United States)
  6. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  7. Univ. of Colorado, Boulder, CO (United States)
  8. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  9. Univ. of Hawaii, Honolulu, HI (United States)
  10. NASA Ames Research Center (ARC), Moffett Field, Mountain View, CA (United States)
  11. Brookhaven National Lab. (BNL), Upton, NY (United States)
  12. NASA Ames Research Center (ARC), Moffett Field, Mountain View, CA (United States); Univ. Space Research Association, Mountain View, CA (United States)
  13. Columbia Univ., New York, NY (United States); NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  14. California Inst. of Technology (CalTech), La Canada Flintridge, CA (United States). Jet Propulsion Lab.
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1571274
Report Number(s):
PNNL-SA-147352
Journal ID: ISSN 1680-7324
Grant/Contract Number:  
AC05-76RL01830
Resource Type:
Accepted Manuscript
Journal Name:
Atmospheric Chemistry and Physics (Online)
Additional Journal Information:
Journal Name: Atmospheric Chemistry and Physics (Online); Journal Volume: 19; Journal Issue: 14; Journal ID: ISSN 1680-7324
Publisher:
European Geosciences Union
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Pistone, Kristina, Redemann, Jens, Doherty, Sarah, Zuidema, Paquita, Burton, Sharon, Cairns, Brian, Cochrane, Sabrina, Ferrare, Richard, Flynn, Connor, Freitag, Steffen, Howell, Steven G., Kacenelenbogen, Meloë, LeBlanc, Samuel, Liu, Xu, Schmidt, K. Sebastian, Sedlacek III, Arthur J., Segal-Rozenhaimer, Michal, Shinozuka, Yohei, Stamnes, Snorre, van Diedenhoven, Bastiaan, Van Harten, Gerard, and Xu, Feng. Intercomparison of biomass burning aerosol optical properties from in situ and remote-sensing instruments in ORACLES-2016. United States: N. p., 2019. Web. doi:10.5194/acp-19-9181-2019.
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Pistone, Kristina, Redemann, Jens, Doherty, Sarah, Zuidema, Paquita, Burton, Sharon, Cairns, Brian, Cochrane, Sabrina, Ferrare, Richard, Flynn, Connor, Freitag, Steffen, Howell, Steven G., Kacenelenbogen, Meloë, LeBlanc, Samuel, Liu, Xu, Schmidt, K. Sebastian, Sedlacek III, Arthur J., Segal-Rozenhaimer, Michal, Shinozuka, Yohei, Stamnes, Snorre, van Diedenhoven, Bastiaan, Van Harten, Gerard, & Xu, Feng. Intercomparison of biomass burning aerosol optical properties from in situ and remote-sensing instruments in ORACLES-2016. United States. doi:https://doi.org/10.5194/acp-19-9181-2019
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Pistone, Kristina, Redemann, Jens, Doherty, Sarah, Zuidema, Paquita, Burton, Sharon, Cairns, Brian, Cochrane, Sabrina, Ferrare, Richard, Flynn, Connor, Freitag, Steffen, Howell, Steven G., Kacenelenbogen, Meloë, LeBlanc, Samuel, Liu, Xu, Schmidt, K. Sebastian, Sedlacek III, Arthur J., Segal-Rozenhaimer, Michal, Shinozuka, Yohei, Stamnes, Snorre, van Diedenhoven, Bastiaan, Van Harten, Gerard, and Xu, Feng. Thu . "Intercomparison of biomass burning aerosol optical properties from in situ and remote-sensing instruments in ORACLES-2016". United States. doi:https://doi.org/10.5194/acp-19-9181-2019. https://www.osti.gov/servlets/purl/1571274.
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@article{osti_1571274,
title = {Intercomparison of biomass burning aerosol optical properties from in situ and remote-sensing instruments in ORACLES-2016},
author = {Pistone, Kristina and Redemann, Jens and Doherty, Sarah and Zuidema, Paquita and Burton, Sharon and Cairns, Brian and Cochrane, Sabrina and Ferrare, Richard and Flynn, Connor and Freitag, Steffen and Howell, Steven G. and Kacenelenbogen, Meloë and LeBlanc, Samuel and Liu, Xu and Schmidt, K. Sebastian and Sedlacek III, Arthur J. and Segal-Rozenhaimer, Michal and Shinozuka, Yohei and Stamnes, Snorre and van Diedenhoven, Bastiaan and Van Harten, Gerard and Xu, Feng},
abstractNote = {The total effect of aerosols, both directly and on cloud properties, remains the biggest source of uncertainty in anthropogenic radiative forcing on the climate. Correct characterization of intensive aerosol optical properties, particularly in conditions where absorbing aerosol is present, is a crucial factor in quantifying these effects. The southeast Atlantic Ocean (SEA), with seasonal biomass burning smoke plumes overlying and mixing with a persistent stratocumulus cloud deck, offers an excellent natural laboratory to make the observations necessary to understand the complexities of aerosol–cloud–radiation interactions. The first field deployment of the NASA ORACLES (ObseRvations of Aerosols above CLouds and their intEractionS) campaign was conducted in September of 2016 out of Walvis Bay, Namibia. Data collected during ORACLES-2016 are used to derive aerosol properties from an unprecedented number of simultaneous measurement techniques over this region. Here, we present results from six of the eight independent instruments or instrument combinations, all applied to measure or retrieve aerosol absorption and single-scattering albedo. Most but not all of the biomass burning aerosol was located in the free troposphere, in relative humidities typically ranging up to 60%. We present the single-scattering albedo (SSA), absorbing and total aerosol optical depth (AAOD and AOD), and absorption, scattering, and extinction Ångström exponents (AAE, SAE, and EAE, respectively) for specific case studies looking at near-coincident and near-colocated measurements from multiple instruments, and SSAs for the broader campaign average over the month-long deployment. For the case studies, we find that SSA agrees within the measurement uncertainties between multiple instruments, though, over all cases, there is no strong correlation between values reported by one instrument and another. We also find that agreement between the instruments is more robust at higher aerosol loading (AOD400 > 0.4).The campaign-wide average and range shows differences in the values measured by each instrument. We find the ORACLES-2016 campaign-average SSA at 500 > nm (SSA500) to be between 0.85 and 0.88, depending on the instrument considered (4STAR, AirMSPI, or in situ measurements), with the interquartile ranges for all instruments between 0.83 and 0.89. This is consistent with previous September values reported over the region (between 0.84 and 0.90 for SSA at 550nm). The results suggest that the differences observed in the campaign-average values may be dominated by instrument-specific spatial sampling differences and the natural physical variability in aerosol conditions over the SEA, rather than fundamental methodological differences.},
doi = {10.5194/acp-19-9181-2019},
journal = {Atmospheric Chemistry and Physics (Online)},
number = 14,
volume = 19,
place = {United States},
year = {2019},
month = {7}
}
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DOI:  https://doi.org/10.5194/acp-19-9181-2019
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Figures / Tables:

Figure 1 Figure 1: Summary of average SEA/African BB SSA as reported in previous studies as described in the text. The spatial and methodological variability can be noted from the Haywood et al. (2003) versus Russell et al. (2010) SAFARI-2000 results, and the seasonal changes in SSA are seen in the Eckmore » et al. (2013) monthly averages from the Zambian AERONET site.« less
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journal, May 2018

  • Zuidema, Paquita; Sedlacek, Arthur J.; Flynn, Connor
  • Geophysical Research Letters, Vol. 45, Issue 9
  • DOI: 10.1002/2017GL076926

A new method for deriving aerosol solar radiative forcing and its first application within MILAGRO/INTEX-B
journal, January 2010

  • Schmidt, K. S.; Pilewskie, P.; Bergstrom, R.
  • Atmospheric Chemistry and Physics Discussions, Vol. 10, Issue 2
  • DOI: 10.5194/acpd-10-2731-2010

Aerosol spectral absorption in the Mexico City area: results from airborne measurements during MILAGRO/INTEX B
journal, January 2009

  • Bergstrom, R. W.; Schmidt, K. S.; Coddington, O.
  • Atmospheric Chemistry and Physics Discussions, Vol. 9, Issue 6
  • DOI: 10.5194/acpd-9-27543-2009

The Airborne Multiangle SpectroPolarimetric Imager (AirMSPI): a new tool for aerosol and cloud remote sensing
journal, January 2013

  • Diner, D. J.; Xu, F.; Garay, M. J.
  • Atmospheric Measurement Techniques Discussions, Vol. 6, Issue 1
  • DOI: 10.5194/amtd-6-1717-2013
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    Works referencing / citing this record:

    Satellite inference of water vapour and above-cloud aerosol combined effect on radiative budget and cloud-top processes in the southeastern Atlantic Ocean
    journal, January 2019

    • Deaconu, Lucia T.; Ferlay, Nicolas; Waquet, Fabien
    • Atmospheric Chemistry and Physics, Vol. 19, Issue 17
    • DOI: 10.5194/acp-19-11613-2019

    The diurnal cycle of the smoky marine boundary layer observed during August in the remote southeast Atlantic
    journal, January 2019

    Above-cloud aerosol optical depth from airborne observations in the southeast Atlantic
    journal, January 2020

    • LeBlanc, Samuel E.; Redemann, Jens; Flynn, Connor
    • Atmospheric Chemistry and Physics, Vol. 20, Issue 3
    • DOI: 10.5194/acp-20-1565-2020

    Above-cloud aerosol radiative effects based on ORACLES 2016 and ORACLES 2017 aircraft experiments
    journal, January 2019

    • Cochrane, Sabrina P.; Schmidt, K. Sebastian; Chen, Hong
    • Atmospheric Measurement Techniques, Vol. 12, Issue 12
    • DOI: 10.5194/amt-12-6505-2019
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      Figure 3 (p. 11)figure
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      Figure 4 (p. 12)figure
      Figure 5 (p. 13)figure
      Figure 6 (p. 14)figure
      Figure 7 (p. 15)figure
      Figure 8 (p. 17)figure
      Figure 9 (p. 18)figure
      Figure 10 (p. 19)figure
      Figure 11 (p. 19)figure
      Figure A1 (p. 22)figure
      Figure A2 (p. 22)figure
      Figure A3 (p. 23)figure
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