SGP/NSA/MOLTS/X1 - Misnamed measurements

The short names of the U-component and V-component of the wind are incorrectly 
stated as wdir and wspd in the header. This will be corrected when the ingest is changed 
to process later data.

• Unit Vector Wind Direction(wdir)
• Mean Wind Speed(wspd)

• Unit Vector Wind Direction(wdir)
• Mean Wind Speed(wspd)

• Unit Vector Wind Direction(wdir)
• Mean Wind Speed(wspd)

• Mean Wind Speed(wspd)
• Unit Vector Wind Direction(wdir)

SGP/MOLTS/X1 - Incorrect units

Misnamed units (m2/m2) should be m2/s2.  Will be corrected when ingest is changed to 
process later data.

• Turbulent kinetic energy in a layer(turb_kin)

SGP/ARSCL/C1 - ARSCL Cloud Bases and Low-level reflectivities

Prior to February 4, 2000, the ARSCL data set incorporated data from the
Beaufort Laser Ceilometer as one of its inputs.  Because of the BLC's
high spatial resolution, this data was often chosen by ARSCL as the
"CloudBaseBestEstimate" for boundary layer clouds. It was subsequently
determined that the BLC cloud base was biased, with the BLC reporting
cloud base heights that are 122 meters too high.

The bias error will be corrected when the entire ARSCL data set is
reprocessed as part of release_4.  (The release version number is included
the the netCDF global comments).   This reprocessing will also include a
small correction the the MMCR near-field reflectivities.  This correction
is less than 1 dB except for hydrometers within 200 meters of the surface.

Thanks to Roger Marchand for helping bracket this problem.

• LASER Cloud Base Height Best Estimate(CloudBaseBestEstimate)

• BLC/VCEIL Clothiaux et al. Algorithm Cloud Base Height(CloudBaseCeilometerCloth)
• MMCR Reflectivity(Reflectivity)
• MMCR Best Estimate of Hydrometeor Reflectivity(ReflectivityBestEstimate)
• BLC/VCEIL Standard Algorithm Cloud Base Height(CloudBaseCeilometerStd)
• LASER Cloud Base Height Best Estimate(CloudBaseBestEstimate)

• BLC/VCEIL Clothiaux et al. Algorithm Cloud Base Height(CloudBaseCeilometerCloth)
• BLC/VCEIL Standard Algorithm Cloud Base Height(CloudBaseCeilometerStd)

SGP/MPL/C1 - Metadata errors

The latitude, longitude and altitude of the Micropulse Lidar
(MPL) were incorrectly entered into the ARM database.  The 
correct location of the SGP.C1 MPL is:
   Lat: 36.606N
   Lon: 97.485W
   Alt:    316m

• lat(lat)
• lon(lon)
• Dummy altitude for Zeb(alt)

• lon(lon)
• lat(lat)
• Dummy altitude for Zeb(alt)

SGP/MPL/C1 - Metadata errors

The latitude, longitude and altitude of the Micropulse Lidar
(MPL) were incorrectly entered into the ARM database.  The 
correct location of the SGP.C1 MPL is:
   Lat: 36.606N
   Lon: 97.485W
   Alt:    316m

• lat(lat)
• lon(lon)
• Dummy altitude for Zeb(alt)

SGP/MOLTS/X1 - Reprocess: time_offset

The "time_offset" field was incorrectly written as "time_offsets" (extra "s")

• Time offset from base_time(time_offsets)

• Time offset from base_time(time_offsets)

SGP/MOLTS/X1 - Reprocess: time_offset

The "time_offset" field was incorrectly written as "time_offsets" (extra "s")

• Time offset from base_time(time_offsets)

• Time offset from base_time(time_offsets)

SGP/SIRS/C1 - SWFANAL Data description error

The long name attribute for the cloud effect fields incorrectly
defines the cloud effect to be the difference between the 
clearskyfit and measured values:

"Difference: ***fluxdn_clearskyfit - ***fluxdn_measured (***fcg)" ;

The cloud effects are correctly calculated by subtracting the 
irradiance calculated in the clear sky fit from the measured 
irradiance.

"Difference: ***fluxdn_measured - ***fluxdn_clearskyfit (***fcg)" ;

NOTE: this is just a documentation error.  The data are correctly
calculated.

• Difference: difswfluxdn_measured - difswfluxdn_clearskyfit (diffcg)(difswfluxdn_cloudeffect)
• Difference: sswfluxdn_measured - sswfluxdn_clearskyfit (sswfcg)(sswfluxdn_cloudeffect)
• Difference: gswfluxdn_measured - gswfluxdn_clearskyfit (gswfcg)(gswfluxdn_cloudeffect)

• Difference: gswfluxdn_measured - gswfluxdn_clearskyfit (gswfcg)(gswfluxdn_cloudeffect)
• Difference: sswfluxdn_measured - sswfluxdn_clearskyfit (sswfcg)(sswfluxdn_cloudeffect)
• Difference: difswfluxdn_measured - difswfluxdn_clearskyfit (diffcg)(difswfluxdn_cloudeffect)

Instrument misalignment report

A low-resolution (300 m) MPL system (unit number 04) was installed at the
SGP site in April '97 upon the laser diode failure of the 02 unit in
March.  Calibration of this instrument in August found that the optics
were misaligned causing a near range focusing error in the data.  
Calibration files produced for this data, while acceptable, do not 
completely correct for the problem.  As a result, aerosol property 
retrievals using this data are not suggested.  Cloud boundary heights, 
though appear satisfactory.  This system was removed from SGP in early 
September

• Aerosol backscatter coefficient at 355 nm(backscatter)