55 2160
McElroy, Tom;Midwinter, Clive;Barton, David;Hall, Bob;Kerr, James;Wardle, David
ENVIRONMENT CANADA, Dowsview, Ontario, CANADA  M3H 5T4    (416) 739-4630
Brewer Ozone Spectrophotometer data at Barbers Point  (  21.31,  158.07)
STRAT
1 1
1996 12 10 1996 12 10
0
13
elapsed time in UT seconds from 0000 hours on the day given in DATE
Station name
9
1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0
99 99 99 999 999 999 999 999 999
hour
minute
second
airmass
ozone        [DU]  (Dobson Units)
ozone error  [DU]  (Dobson Units)
SO2          [DU]  (Dobson Units)
SO2 error    [DU]  (Dobson Units)
Number of data points in row
9
0
1  1  1  1  1  1  1  1  1
99 9999 999 999 99999 999 999 999 999
number of observations
instrument number
station latitude (degrees)
station longitude (degrees)
station elevation (m)
daily mean O3        [DU] (Dobson Units)
daily mean O3 error  [DU] (Dobson Units)
daily mean SO2       [DU] (Dobson Units)
daily mean SO2 error [DU] (Dobson Units)
1
*** preliminary data ***
16
The Brewer Ozone Spectrophotometer is a 15-cm focal-length, modified
Ebert-Fastie spectrograph which makes rapid, time-multiplexed
measurements in the UV-B region of the solar spectrum.  A typical
direct sun observation is the average of 5 separate observations.
If the standard deviation of the measurements is less than 2 DU, the
measurement is taken as acceptable.  If the standard deviation is larger,
it is interpreted as indicating variability of the solar intensity, i.e.:
clouds or other optical attenuation.  Each of the five ozone
measurements which contributes to the average value are composed of 40 
short observation samples.  A cycle of 2 samples on each of the five 
wavelengths takes place in about 1.2 seconds.  The usual measurement of 
20 cycles takes under 30 seconds.  Daily averages are calcluted using 
all good observations and are reported as the last line in the data 
table.


Barbers Point 
18 009   21.31  158.07     0.0  275.6    2.0   -2.1    0.2
68164   18 56 04  2.565  255.2     4.8    2.0     2.1     5
69213   19 13 33  2.279  272.3     3.7   -1.1     0.7     5
69730   19 22 10  2.165  277.7     2.6   -1.8     0.7     5
70799   19 39 59  1.972  276.3     1.6   -1.9     0.4     5
72465   20 07 45  1.755  277.1     1.3   -2.1     0.3     5
72977   20 16 17  1.703  276.5     1.1   -1.8     0.1     5
74286   20 38 06  1.595  272.3     3.4   -1.5     0.7     5
74800   20 46 40  1.561  278.4     2.3   -2.2     0.6     5
76290   21 11 30  1.483  273.5     4.3   -2.2     0.9     5
77236   21 27 16  1.447  259.4     4.6    4.8     2.3     5
78405   21 46 45  1.416  271.4     1.6   -1.9     0.2     5
79351   22 02 31  1.401  273.9     0.9   -2.6     0.3     5
82462   22 54 22  1.406  275.4     2.3   -1.9     0.5     5
83120   23 05 20  1.418  270.9     2.9   -2.1     1.0     5
84065   23 21 05  1.442  276.0     0.5   -2.3     0.2     5
84576   23 29 36  1.460  275.7     1.0   -2.1     0.3     5
88506   00 35 06  1.707  267.5     3.1   -1.5     0.8     5
89677   00 54 37  1.836  270.8     3.4   -1.8     0.7     5