PPT-Cloud Physics Cloud formation and precipitation processes

Guest lecture by Prof Kathleen Schiro 12 October 2020 Cloud Droplet Formation Review of how condensation occurs Curvature effect Cloud condensation nuclei Solute effect 33 x 10 5 Jkg 25 x 10. VOCALS RF07: Over broken clouds and very thin Stratus clouds at south end of POC region, by Tony Clarke. Coalescence scavenging: . the importance of cloud-driven aerosol sinks. Robert Wood. ,. . University of Washington. rainrate. increases. Kubar. , T., D. L. Hartmann, and R. Wood, 2009: Understanding the importance of microphysics . and macrophysics . for warm rain in marine low clouds: Part I. Satellite observations. . Robert Wood, University of Washington. w. ith Ryan Eastman, Daniel McCoy, Daniel Grosvenor (University of Washington); Matt . Lebsock. (JPL). “Background” (minimum imposed) cloud droplet concentration influences aerosol indirect effects. ACE is presently in pre-formulation and will be realized in some form in the early to mid . ’. 20s. . ACE is a response to the . The extreme sensitivity of the climate system to hydrological processes especially clouds and precipitation. . Photograph: Tony Clarke, VOCALS . REx. flight RF07. Robert Wood. University of Washington. with Rhea George, Chris . Terai. , Dave Leon, Jeff Snider. or. . Control of cloud droplet concentration in marine stratocumulus clouds. ACE is presently in pre-formulation and will be realized in some form in the early to mid . ’. 20s. . ACE is a response to the . The extreme sensitivity of the climate system to hydrological processes especially clouds and precipitation. “continental” – polluted, aerosol laden. “maritime” – clean, pristine. Polluted concentrations are 1-2 orders of magnitude greater than clean maritime. Preindustrial continental was only up to 2 times greater than maritime. Olaf Stiller, Axel Seifert . and. Martin Köhler. Deutscher Wetterdienst, Offenbach, Germany. An NWP perspective:. scientific understanding .   . capability to model . .. Uncertainties in . Robert Wood Graham Feingold Dave Turner. Warm cloud responses to aerosols. Microphysical, structural, and dynamical properties of low, liquid-phase clouds show sensitivity to aerosol loading, . but. the responses are not uniform. . Photograph: Tony Clarke, VOCALS . REx. flight RF07. Robert Wood. University of Washington. Dave Leon and Jeff Snider, University of Wyoming. Radiative. impact of cloud droplet concentration variations. mesoscale. structure and cloudiness transitions. Robert Wood,. . University of Washington. with help and data from Louise Leahy (UW), Matt . Lebsock. (JPL), Irina . Sandu. (ECMWF). Photo: . Mingxi. about 1000 m/48 hrs. Thus, they usually evaporate quickly upon leaving the cloud mass. . For it to fall as a raindrop the cloud droplet must get bigger. One raindrop = about 1 million cloud droplets, . of . low clouds . to . aerosols. Robert . Wood, Atmospheric . Sciences,. University of Washington. Motivation. Aerosol impacts on clouds are not simply explained by . Twomey’s. arguments. Changes in . :. www.geos.ed.ac.uk. /~. dstevens. /...DS_L3_Precipitation_development.ppt. Precipitation development;. Warm and Cold clouds. >0. °. C. <0. °. C. Last lectures from me…. Cloud droplet formation (micro-scales).