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Aerosol Direct Radiative Forcing Measurements and Regional Assessment

This study presents measurements and assessments of aerosol direct radiative forcing, including sub-1.mm particle measurements, aerosol extinction, humidity scans, aerosol composition, and comparison of different measurement techniques. The study also explores the dependence of aerosol scattering and extinction on humidity and aerosol composition.

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Aerosol Direct Radiative Forcing Measurements and Regional Assessment

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  1. ICARTT 2004 Ronald H. Brown – Measurements Relevant to Aerosol Direct Radiative Forcing

  2. Regional Assessment of Aerosol Direct Radiative Forcing - MEASUREMENTS

  3. Measurements: Sub-1 mm particles • Cavity Ring Down Extinction Cell • Aerosol extinction & f(RH) (66% / 30%) continuous • plus humidity scans • Humidograph • Aerosol scattering & f(RH) • humidity scans (increasing and decreasing RH) • between 35 and 90% RH • Aerosol composition • Aerodyne Mass Spectrometer, PILS, impactors • SO4=, NO3-, NH4+, POM, EC, Trace elements

  4. Comparison of Hygroscopic Growth Dependence of Aerosol Scattering from Humidified Nephelometer and Extinction from CRD DOY 203 (12:00 UTC) f(RH) f(RH) RH RH

  5. Dependence of f(RH) on aerosol composition

  6. Extinction (Mm-1) Comparison of Extinction Measured by Cavity Ring-down Extinction Cell and OPAL (LIDAR) at  = 355 nm Ambient RH = 80 to 90%

  7. Comparison of 3 Microtops Units for 380, 500, 675, 870 nm

  8. Comparison of 2 Microtops Units for 440 nm

  9. RHB: Spatial Distribution of AOD measurements

  10. RHB: Time Series of Sub-10 um Scattering and AOD J31 Overflights

  11. RHB: Time Series of Sub-10 um Scattering and AOD

  12. Time series of AOD and spectral slope Regions of higher AOD: Polluted, more small particles stronger spectral dependence

  13. Wang et al., JGR, 2003. Used shipboard AOD measurements to determine the accuracy of AOD retrievals from the GMS5 geostationary satellite.

  14. Markowicz et al., JGR, 2003. Used shipboard f(RH) measurements to estimate the dependence of Surface and top of atmosphere forcing on RH. Diurnally averaged aerosol forcing efficiencies determine from a radiative transfer model as a function of RH.

  15. Contacts: f(RH): Tahllee Baynard, tbaynard@al.noaa.gov Wei Wang, weiwang@uiuc.edu Scattering, backscattering, absorption: Trish Quinn, patricia.k.quinn@noaa.gov Also available at http://saga.pmel.noaa.gov/data AOD: Trish Quinn, patricia.k.quinn@noaa.gov Also available at http://saga.pmel.noaa.gov/data

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