The Fog Remote Sensing and Modeling FRAM Field Project and Preliminary Results'

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The Fog Remote Sensing and Modeling (FRAM) Field
Project and Preliminary Results.

• I.Gultepe

1Cloud Physics and Severe Weather Research
Section, Science and Technology Branch,
Environment Canada Toronto, Ontario, M3H 5T4,
Canada
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FOG FORMATION OVER SNOW
MARINE ADVECTIVE FOG
VisVrhVliquidfogVicefogVdrizzleVrainVsnow
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FRAM-LUNENBURG
DMT FMD SPP-FM
Campbell Scientific HMP45C
VIDEO camera
Climatronic aerosol profiler (CAP)
Vaisala FD12P
EPPLEY radiometer
Young 81000 Sonic anemometer (YUSA)
MWR TP3000
Vaisala Ceilometer CT25K
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Ni and VIS
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MWR TP3000
Jan 4 2006
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VIDEO PROCESSING
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CAP 0.310
YUW 32Hz
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FT12P Vis
Marine fog (Lunenburg) 70 time during June
2006 Duration gt 1 hour Vislt 1 km
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FMD fog microphysics summary
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VIS VERSUS dBZ
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Visf(PR)
Visf(RHw)
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Vis parameterization for forecasting models
RUC Vis
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FOG DETECTION USING INTEGRATED DATA
FOG AREA WITHOUT GEM
FOG AREA WITH GEM
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CONCLUSIONS

• PARAMETRIZATION OF VISIBILITY IS STILL IN THE
  QUESTION BECAUSE PARTICLES SIZES lt 2-3 MICRON
  ARE IMPORTANT FOR EXTINCTION CALCULATIONS
• PRESENT FORECASTING MODELS (e.g. RUC MODEL) USE
  ONLY VIS-LWC RELATIOSHIPS THAT CAUSE LARGE
  UNCERTAINTIES IN VIS.
• PHYSICS, FORMATION, DEVELOPMENT, AND DISSIPATION
  OF MARINE AND CONTINENTAL FOGS ARE SIGNIFICANTLY
  DIFFERENT AND THAT NEEDS TO BE PAID MORE
  ATTENTION.
• PHYSICS OF FOG DROPLETS CAN HELP US BETTER
  UNDERSTAND NUCLEATION OF DROPLETS WITHIN THE
  CLOUD

?INTEGRATION OF OBSERVATIONS AND DATA FROM
MULTIPLE PLATFORMS ARE NEEDED TO BETTER FORECAST
FOG. ?OCCURRENCE OF FOG IN VARIOUS TIME AND
SPACE SCALES RESULTS LIKELY UNDERESTIMATE OF ITS
CLIMATOLOGY