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Cloud and Aerosol Properties Study during CalNex using Spectral Methods

This study explores cloud and aerosol properties using newly developed spectral methods. It focuses on the measurement of cloud microphysics and aerosol optical properties using the Solar Spectral Flux Radiometer (SSFR) and Atlantis Instrumentation. The study also includes satellite validation, aerosol remote sensing, and comparative analysis of different platforms.

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Cloud and Aerosol Properties Study during CalNex using Spectral Methods

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  1. The study of cloud and aerosol properties during CalNex using newly developed spectral methods Patrick J. McBride, Samuel LeBlanc, K. Sebastian Schmidt, Peter Pilewskie University of Colorado, ATOC/LASP Chris Fairall, Dan Wolfe, Sara Lance NOAA/ESRL, Boulder, CO Patrick Minnis, Kristopher M. Bedka, Chris Hostetler, Rich Ferrare NASA Langley, Hampton, VA Warren Gore, Jens Redemann, Philip B. Russell NASA Ames, CA CalNex data workshop, Sacramento, CA

  2. P3 Instrumentation SSFR NOAA P3 • Solar Spectral Flux Radiometer • Zenith and nadir viewing spectral irradiance at 411 wavelengths • Sampling frequency of 1 Hz • Spectral range: 350-2100 nm • In-situ • Cloud microphysics • Aerosol optical properties

  3. “clear” “clear” clouds clouds Atlantis Instrumentation • SSFR • Zenith viewing irradiance and radiance reported at 313 wavelengths • Sampling frequency of 1 Hz • Spectral range: 350-1700 nm NOAA R/V Atlantis • Microwave radiometer (MWR) • Retrieves column integrated liquid water and water vapor • Cloud Radar • Provides profiles of backscatter from cloud

  4. Other data sources GOES NASA King Air Geostationary Operational Environmental Satellites (GOES) Provides cloud optical thickness and effective radius over 4 km. High Spectral Resolution Lidar (HSRL) Profiles aerosol extinction coefficients at 532 nm

  5. Cloud remote sensing τ, reff, LWP GOES Atlantis cloud retrievals Cloud property (τ, reff, LWP) retrievals performed for the first time on the SSFR and derived from transmitted spectral radiance. Near real-time cloud retrieval. (See McBride et al., A spectral method for retrieving cloud optical thickness and effective radius from surface-based transmittance measurements, ACPD, 2011a. NOAA P3 NOAA R/V Atlantis • Satellite validation • Can derive radiative forcing

  6. MODIS cloud image

  7. Microwave radiometer comparison Broken cloud McBride et al. 2011b, In preparation

  8. Comparing multiple platforms GEOS-NESDIS data provided by Andy Heidinger and Andi Walther McBride et al. 2011b, In preparation

  9. Atlantis LWP statistical comparison Histogram filtered for overcast cases Factors still to be explored: Cloud inhomogeneities Cloud phase Number of cloud layers Precipitation Polluted cloud Histogram for all times where LWP > 30 gm-2 (1 minute averages) Still to do: Statistical analysis with GOES cloud properties

  10. Collaborative cloud observations Broken cloud cases Overcast cases

  11. Aerosol remote sensing NOAA P3 NASA King Air g, ϖ, τ NOAA R/V Atlantis

  12. Aerosol optical property retrievals 19 May 2010 In situ Cavity Ring Down (CRD) 30 min. between HSRL and CRD data Retrieved aerosol properties for this aerosol layer CRD data provided by Justin Langridge, NOAA HSRL

  13. Aerosol retrieval results Relative forcing efficiency = Single Scattering Albedo Asymmetry parameter Optical depth Surface Albedo • Inputs to the retrieval: • SSFR irradiance • Aeronet Angstrom parameter • HSRL extinction LeBlanc et al. 2011, In preparation

  14. Relative forcing efficiency comparison Relative forcing efficiency Spectral shape of relative forcing efficiency comparable to within 15% of previous results LeBlanc et al. 2011, In preparation

  15. Capabilities • Ability to retrieve cloud properties (τ, reff, LWP) from transmitted spectral radiance • Studying cloud optical properties from above and below using statistical methods • Aerosol optical property retrieval (g, ϖ, τ)without simultaneous optical thickness observation • Relative forcing efficiency is within 15% of previous experiments

  16. Future work • Statistical comparison of different viewing geometries • Using in-situ observations, cloud radar, microwave radiometer, satellite data • Aerosol-cloud interaction study • Ship-based aerosol property retrievals • Simultaneous retrieval of aerosol and cloud properties under overcast and broken cloud fields

  17. SSFR data information • NOAA P3 • 30 flights • 151 hours of data collected • Over 543,000 spectral collected • Spectra reported at 411 wavelengths over the range 350 to 2150 nm • Data archive location • www.esrl.noaa.gov/csd/tropchem/2010calnex/P3/DataDownload/index.php • R/V Atlantis • 273 hours of data collected • Over 983,000 spectra collected • Spectra reported at 313 wavelengths over the range 350 to 1700 nm • Data archive location • ftp://laspftp.colorado.edu/pub/schmidt/calnex/atlantis/

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