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 Fairbanks ( 64.84, 147.56)
POLARIS
1 1
1997 07 26 1997 09 08
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.
Fairbanks
3 007 64.84 147.56 0.0 267.7 1.4 4.9 0.4
82388 22 53 08 1.448 266.0 2.5 5.3 0.5 5
82906 23 01 46 1.456 269.5 2.4 4.3 0.8 5
83598 23 13 18 1.469 267.7 2.1 5.1 0.5 5
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