FILE: README.KOF  ---  Describes archival Kuwait Formaldehyde data files.

The data were obtained from the NCAR Electra during the KOFSE program
flown out of Bahrain in May of 1991.

The data are in ASCII written to the disk in the following format:

   99 FORMAT (F8.6,6(1X,F8.3),1X,A8)

The following write statement is used for identifying the data written in
the above format.

      WRITE (12,99) timf(i),xfors(i),xforf(i),xso2(i),palt(i),zero(i),
     $formc(i),time(i)

where:
      timf = fraction of the day after midnight.
      xfors = the raw formaldehyde signal.
      xforf = the raw flow rate through the formaldehyde instrument.
      xso2 = the raw SO2 signal.
      palt = the pressure altitude.
      zero = the calculated formaldehyde signal zero value (see discussion
	     below).
      formc = the calculated formaldehyde concentration in ppbv.
      time = the time in ASCII format -- hr:mm:ss

The file imports into lotus 123 easily, using File, Import, Numbers.

A FEW WORDS ON THE DATA PROCESSING:

The data are initially averaged to ten seconds and then shifted
in time to be processed in a two pass scheme.

Due to instrument delay time both "xfors" and "xso2" are shifted in time --
"xfors" is shifted 2 minutes 40 seconds and "xso2" is shifted 30 seconds.

Zero values of "xfors" are determined by inspection (there is no status signal)
of plotted shifted data using both "xso2" and "palt" as a reference.

After the zero values are determined, a cubic spline is used to interpolate
zero values for the entire time series (the variable "zero" above).

A second pass through the data using the zero values obtained from the spline
is performed to calculate the formaldehyde concentration in ppbv. The
calculation used is as follows:

	formc(i)=((((xfors(i)-zero(i))*100.)*0.199)-0.245)*0.7739/
     $(xforf(i)*0.2)

NOTE: Flight 10 has no data for "xso2" and "palt" -- the data are in the
identical format as all the other data with "xso2" and "palt" set to -999.0.


03/16/92.....