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 18 1997 04 18
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 
14 007   37.42  122.58     0.0  329.6    2.5    1.8    2.0
55823   15 30 23  2.547  327.7     2.7   -0.6     1.1     5
56557   15 42 37  2.324  328.4     4.5   -0.4     1.6     5
57087   15 51 27  2.188  327.5     2.2    0.5     1.0     5
57618   16 00 18  2.068  329.3     2.1    0.3     0.6     5
58987   16 23 07  1.820  331.7     2.4    0.1     0.6     5
59724   16 35 24  1.715  329.9     0.5    1.2     0.1     5
62229   17 17 09  1.453  329.2     3.0    2.2     0.8     5
63266   17 34 26  1.377  329.3     4.0    2.2     0.9     5
63806   17 43 26  1.343  325.2     2.7    3.6     0.7     5
68742   19 05 42  1.153  330.1     1.9    2.2     0.6     5
69270   19 14 30  1.143  333.2     2.4    2.6     0.8     5
69799   19 23 19  1.134  337.7     2.9    1.6     1.0     5
70985   19 43 05  1.121  337.1     4.0    1.2     1.1     5
73322   20 22 02  1.116  325.5     1.6    5.9     0.3     5