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Airborne survey of dust & clouds

Airborne survey of dust & clouds. V. Ramanathan and Joachim Koettner NCAR visit last April, CIFEX (Cloud Indirect Effects Experiment) expressed interest in new ice-related study: Effects of dust on cloud ice processes + Long-range transport, removal, & transformation. Asian dust event.

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Airborne survey of dust & clouds

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  1. Airborne survey of dust & clouds • V. Ramanathan and Joachim Koettner • NCAR visit • last April, CIFEX (Cloud Indirect Effects Experiment) • expressed interest in new ice-related study: Effects of dust on cloud ice processes + Long-range transport, removal, & transformation

  2. Asian dust event “On April 15th, 1998, a dust storm in Western China has produced a huge atmospheric dust cloud that was transported across the Pacific Ocean and caused elevated aerosol concentrations over much of the Pacific Coast of North America.” http://capita.wustl.edu/Asia-FarEast/

  3. Outbreak of Saharan dust 26-Feb-2000

  4. HIAPER – Pacific Ocean flight tracks Japan –Guam – Wake Is. –Midway – Hawaii – Alaska- West Coast - Colorado

  5. HIAPER – Atlantic Oceanflight tracks

  6. Possible Airborne Study using G-V • HIAPER follows dust events • Japan - Pacific Ocean – North America • Cape Verde – Atlantic Ocean – Caribbean islands – Florida • Payload • Remote sensing: lidar, up/down spectral radiometers, mm-radar • Aerosols: ice nuclei, CCN, particle sizes & conc, chemical composition (filters + PALMS), volatility • Cloud microphysics: droplets, snow crystals, CVI • Dropsondes • Satcom up/down relay of real-time data, satellite imagery, & forecast products

  7. Lab & Modeling Studiesparallel to field work • Choose well defined cases (initial conditions & forcing) • dust sources with distinct properties • Develop hypotheses: • dust = active IN and changes cloud properties • scavenging mechanisms & removal rates • … • Metrics & instrumentation: • equivalent & complementary • Lab study questions: • dust generation • aging of dust, soot, organic coating, .. • Modeling questions: • characterizing aerosol active modes • aging processes, chemical transformations, ..

  8. likely participants & resources U.S. universities • CSU • Alaska • DRI • Michigan Tech. • Univ. Michigan • South Dakota SMT • PennState • Washington • Colorado • Wyoming • Harvard • Iowa (Greg Carmichael) • U.S. Naval Postgraduate School (Phil Durkee ?) NCAR • us + Phil Rasch, Natalie Mahawold, ACD, .. NOAA • GFDL, Aeronomy Lab, .. International collaborations: • Germany, Japan, UK, Canada, China, ..

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