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 08 04 1997 08 04 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 21 007 64.84 147.56 0.0 233.7 2.4 4.8 1.6 67555 18 45 55 1.837 230.6 1.3 3.0 0.3 5 68243 18 57 23 1.789 229.4 1.8 3.2 0.4 5 69454 19 17 34 1.717 234.9 2.6 2.2 0.7 5 77469 21 31 09 1.487 233.3 1.0 4.9 0.3 5 78443 21 47 23 1.483 232.9 0.6 5.6 0.3 5 78957 21 55 57 1.482 231.2 4.1 6.1 0.9 5 79168 21 59 28 1.483 232.5 0.9 5.9 0.3 5 80141 22 15 41 1.485 232.0 2.3 6.4 0.5 5 81341 22 35 41 1.495 230.8 1.0 7.1 0.4 5 82315 22 51 55 1.509 230.5 2.1 7.5 0.7 5 82829 23 00 29 1.518 232.1 1.9 7.2 0.5 5 83511 23 11 51 1.532 231.8 1.2 7.2 0.2 5 86413 24 00 13 1.620 234.7 1.0 4.1 0.2 5 87395 00 16 35 1.663 236.5 0.7 4.1 0.2 5 87909 00 25 09 1.688 235.5 2.3 4.3 0.5 5 88592 00 36 32 1.724 236.6 1.4 4.1 0.2 5 89567 00 52 47 1.783 235.9 1.8 4.2 0.5 5 90082 01 01 22 1.817 236.3 2.9 4.3 0.8 5 90765 01 12 45 1.868 236.6 1.3 3.9 0.3 5 91740 01 29 00 1.948 236.7 1.8 3.8 0.8 5 98678 03 24 38 3.033 236.5 0.3 1.8 0.1 5