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.”
http://capita.wustl.edu/Asia-FarEast/
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)
•
Develop hypotheses:
•
Metrics & instrumentation:
– dust sources with distinct properties
– dust = active IN and changes cloud properties
– scavenging mechanisms & removal rates
– …
– 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 ?)