Airborne survey of dust

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 Ocean flight 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

• 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 ?)