DYCOMS-II Model:  COAMPS 6km Imagery Subset (GIF)


1.0  General Information


The COAMPS 6km Imagery (GIF) is one of several model products 
collected as part of the Dynamics and Chemistry of Marine 
Stratocumulus Phase II: Entrainment Studies (DYCOMS-II) project 
field catalog operated by the University Corporation for 
Atmospheric Research/Joint Office for Science Support (UCAR/JOSS; 
http://www.joss.ucar.edu/dycoms/catalog/).  The plots are from 
the Coupled Atmospheric Mesoscale Prediction System (COAMPS) model
which was run by the Naval Research Laboratory in a special mode
for DYCOMS-II.  Three nested grids were used: a 54km resolution
grid, an inner 18 km grid, and a small 6 km grid over the 
DYCOMS-II target area.  This data set contains a subset of the
imagery from the 6km grid.  Included are surface, 925 mb, and 
850 mb maps, cloud base height, cloud top temperature, cloud
mixing ratio, and water vapor mixing ratio for the analysis
time and forecast imagery every three hours to 24 hours.  The
model was run at 00 and 12 UTC each day.  The products cover the 
period from 1 - 31 July 2001 (no imagery available 23 and 25 July) 
and cover the region from 30-33 N and 119-123 W.  All images are 
in GIF format.


2.0  Data Contact


Melanie Wetzel (wetzel@dri.edu)


3.0  Product Information


The following products are available on the 6km grid over the region
30-33 N and 119-123 W:  Cloud Base Height, Cloud Top Temperature,
500m Cloud Mixing Ratio, 10m Winds/Air Temperature/Sea Level Pressure,
850mb Winds/Relative Humidity/Geopotential Height, and
925mb Winds/Relative Humidity/Geopotential Height.  

Also, the Cloud Mixing Ratio and Water Vapor Mixing Ratio are 
available in crossection from 119-123 W and 0-3000 m in height.


4.0  Quality Control Procedures


     UCAR/JOSS conducted no quality checks on these data.


5.0  File Naming Convention


The file names are structured as follows:

COAMPS_06km.yyyymmddhhmm.ff_prod.gif

Where COAMPS_06km is the data type
      yyyy is the four digit year
      mm is the two digit month
      dd is the two digit day
      hh is the hour (UTC)
      mm is the minute 
       These represent the initial time of the model run.
      ff is the forecast hour (00 = initial analysis)
      prod represents the product name which can be:
       cbas = cloud base height
       ctpt = cloud top temperature
       qccc-500 = 500m cloud mixing ratio
       qccc-xsec = cloud mixing ratio cross-section
       stw10m = 10m Winds/Air Temperature/Sea Level Pressure
       wvap-xsec = water vapor mixing ratio cross-section
       zrh850 = 850mb winds/relative humidity/geopotential height
       zrh925 = 925mb winds/relative humidity/geopotential height


6.0  References


None.