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Virendra P. Ghate and Bruce A. Albrecht (U Miami) Christopher W. Fairall (NOAA ESRL)

Annual cycle of cloud fraction and surface radiative cloud forcing in the South-East Pacific Stratocumulus region. Virendra P. Ghate and Bruce A. Albrecht (U Miami) Christopher W. Fairall (NOAA ESRL) Robert A. Weller (Woods Hole Oceanographic Institution).

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Virendra P. Ghate and Bruce A. Albrecht (U Miami) Christopher W. Fairall (NOAA ESRL)

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  1. Annual cycle of cloud fraction and surface radiative cloud forcing in the South-East Pacific Stratocumulus region Virendra P. Ghate and Bruce A. Albrecht (U Miami) Christopher W. Fairall (NOAA ESRL) Robert A. Weller (Woods Hole Oceanographic Institution)

  2. Significant Component of Earth’s radiation budget. • 20% increase can offset global warming due to doubling of CO2. • Strong feedback with ENSO Klein & Hartmann 1993

  3. WORS • Wood’s Hole Oceanographic Institute (WHOI)’s Ocean Reference Station (WORS). • Location: 20° S 85° W • Continuous observations of surface broadband radiative fluxes and thermodynamic variables since October 2000. • http://uop.whoi.edu/archives/dataarchives.htm

  4. Seasonal variation of meteorology at WORS

  5. Seasonal Variations: Other Properties Surface fluxes of sensible and latent heat, LCL, convective velocity scale, and temperature and moisture advection

  6. Estimating Low Cloud Fraction fro a Buoy • LW = Measured downwelling longwave radiation at the surface. • CF = Cloud Fraction • LWcld = Cloud emitted longwave radiation • LWclr = Clear sky longwave radiation.

  7. Technique • LW = Observed at WORS • LWcld = σTLCL4 • LWclr = f(qsfc,Tsfc,IVsfc); Fairall et al. 2007

  8. Technique Evaluation:Ceilometer Observations

  9. Model-satellite comparison

  10. Seasonal Cycle: Monthly Means Cloud Fraction Annual cycle 0.5-0.7 Cloud Forcing: Surface radiative fluxes Annual Cycle: Solar -125 to -65 W/m2 IR 55 to 35 W/m2

  11. Diurnal Cycle

  12. Diurnal Cycle Cloud Fraction

  13. More Detailed Data Sets • Annual Cruises • VOCALS field Program Fall 2008 http://www.esrl.noaa.gov/psd/people/Simon.deSzoeke/synthesis.html http://www.eol.ucar.edu/projects/vocals/

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