SOS99NASH_WP3D_AIRCR.txt read me file

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Principal Investigator and Contact Information:
Gerd Hubler
NOAA Aeronomy Laboratory
Mail: R/AL7 325 Broadway, Boulder, CO 80307
Email: ghubler@al.noaa.gov
Phone: 303-497-3490

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All data were derived from standard on-board instruments operated by the Aircraft Operations Center (AOC), National Oceanic and Atmospheric Administraion (NOAA), with the exception of H2Olyman, which is explained below.

Data is given at 1 second resolution.  The list of parameters are:

Longitude: decimal degrees
Latitude: decimal degrees
Altitude: as determined by gps
Air speed: true
Pressure: atmospheric barometric
Temperature: air
Temperature: equivalent potential
Temperature: dew point 
Mixing ratio (H2O)
Humidity: relative
Wind direction: resultant mean vector
Wind speed: resultant mean vector
Wind speed: w (mean vertical component:+ up/- down)


Regarding the H2O Mixing Ratio values:

Ambient H2O vapor concentrations (H2Ovp) were derived by AOC from dewpoint measurements with NOAA AOC instruments. In addition a commercial Lyman Alpha hygrometer (AIR) was operated.
The Lyman alpha instrument is a single path instrument and needs to be calibrated. The output of the Lyman alpha was fitted for calibration to the AOC H2O vapor vapor pressure file taking into account residual absorption by O2.

H2Ovp	: water vapor concentration in mb derived from dewpointer
H2O_Lyman	: water vapor concentration in mb derived from Lyman alpha hygrometer calibrated against H2Ovp provided by AOC

The Lyman alpha probe failed on the transit flight. 
There is no data for the flights on 6/26/99.

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