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 NASA Ames  (  37.42,  122.58)
POLARIS
1 1
1997 04 21 1997 04 21
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.


NASA Ames 
16 007   37.42  122.58     0.0  306.7    1.3    2.9    0.7
64275   17 51 15  1.299  295.1     3.0    3.8     1.0     5
67005   18 36 45  1.186  307.6     4.8    2.1     1.1     5
68173   18 56 13  1.154  305.6     3.6    2.2     0.5     5
71344   19 49 04  1.109  304.9     2.7    4.0     0.6     5
71877   19 57 57  1.106  290.0     3.0    7.0     0.7     5
74709   20 45 09  1.117  307.3     0.7    3.3     0.3     5
75775   21 02 55  1.132  304.6     2.7    3.5     0.8     5
76301   21 11 41  1.141  306.2     2.0    3.9     0.7     5
77469   21 31 09  1.169  311.0     3.1    1.9     1.0     5
80152   22 15 52  1.266  308.3     1.6    3.0     0.5     5
80680   22 24 40  1.292  302.8     4.9    4.5     1.3     5
83270   23 07 50  1.466  307.0     2.9    3.1     0.6     5
84000   23 20 00  1.532  305.5     3.5    2.9     0.7     5
86613   00 03 33  1.864  305.0     1.2    2.5     0.3     5
87343   00 15 43  1.996  306.7     1.3    1.9     0.6     5
91076   01 17 56  3.231  307.7     3.3    0.2     1.9     5