The study of cloud and aerosol properties during CalNex using newly developed spectral methods Patrick J. McBride, Samuel LeBlanc, K. Sebastian Schmidt,

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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 Warren Gore, Jens Redemann, Philip B. Russell NASA Ames, CA Chris Fairall, Dan Wolfe, Sara Lance NOAA/ESRL, Boulder, CO Patrick Minnis, Kristopher M. Bedka, Chris Hostetler, Rich Ferrare NASA Langley, Hampton, VA CalNex data workshop, Sacramento, CA

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

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

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

τ, r eff, LWP Cloud remote sensing Satellite validation Can derive radiative forcing NOAA P3 GOES NOAA R/V Atlantis Atlantis cloud retrievals Cloud property ( τ, r eff, 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.

MODIS cloud image

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

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

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

Collaborative cloud observations Overcast cases Broken cloud cases

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

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

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

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

Capabilities  Ability to retrieve cloud properties ( τ, r eff, 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

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

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 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/