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 “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.”

Outbreak of Saharan dust 26-Feb-2000

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

HIAPER – Atlantic Ocean flight tracks

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

Lab & Modeling Studies parallel 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,..

likely participants & resources NCAR –us + Phil Rasch, Natalie Mahawold, ACD,.. NOAA –GFDL, Aeronomy Lab,.. International collaborations: –Germany, Japan, UK, Canada, China,.. 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 ?)