the fog remote sensing and modeling (fram) field project and preliminary results
DESCRIPTION
The Fog Remote Sensing and Modeling (FRAM) Field Project and Preliminary Results. I.Gultepe. 1 Cloud Physics and Severe Weather Research Section, Science and Technology Branch, Environment Canada Toronto, Ontario, M3H 5T4, Canada. FOG FORMATION OVER SNOW. MARINE ADVECTIVE FOG. - PowerPoint PPT PresentationTRANSCRIPT
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
FOG FORMATION OVER SNOW
MARINE ADVECTIVE FOG
Vis=Vrh+Vliquidfog+Vicefog+Vdrizzle+Vrain+Vsnow
FRAM-LUNENBURG
Vaisala FD12P
EPPLEY radiometer
Campbell Scientific HMP45C
Young 81000 Sonic anemometer (YUSA)
MWR TP3000
DMT FMDSPP-FM
VIDEO camera
Climatronic aerosol profiler (CAP)
Vaisala CeilometerCT25K
0 500 1000 15000
0.05
0.1
Time [min]
Nif [106 m
-2s-1
] Feb 10, 2006
IPC1IPC2
Ni and VIS
0 500 1000 15000
50
100
Time [min]
Vis
ibility
[km
] Feb 10, 2006
MWR TP3000Jan 4 2006
VIDEO PROCESSING
CAP [0.3;10]
YUW [32Hz]
FT12P Vis
Marine fog (Lunenburg)
70% time during June 2006
Duration > 1 hour
Vis< 1 km
FMD fog microphysics summary
VIS VERSUS dBZ
Vis=f(RHw)
Vis=f(PR)
Vis parameterization for forecasting models
52.002.1 dLWCxNvis
RUC Vis
FOG DETECTION USING INTEGRATED DATA
FOG AREA WITH GEM
FOG AREA WITHOUT GEM
CONCLUSIONS• PARAMETRIZATION OF VISIBILITY IS
STILL IN THE QUESTION BECAUSE PARTICLES SIZES < 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