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 09 05 1997 09 05 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 15 007 64.84 147.56 0.0 272.1 2.9 3.0 1.1 67919 18 51 59 2.418 272.5 4.0 1.2 1.5 5 68433 19 00 33 2.358 272.9 1.2 1.2 0.4 5 69565 19 19 25 2.243 270.2 1.0 2.1 0.4 5 70080 19 28 00 2.198 269.9 0.5 2.4 0.1 5 70595 19 36 35 2.157 270.0 0.6 2.7 0.3 5 71723 19 55 23 2.080 269.5 1.5 3.3 0.4 5 72238 20 03 58 2.049 267.3 1.4 4.0 0.5 5 72753 20 12 33 2.023 268.4 0.9 3.9 0.3 5 78655 21 50 55 1.886 274.0 1.2 3.1 0.3 5 79631 22 07 11 1.891 272.7 1.4 3.6 0.5 5 80146 22 15 46 1.897 271.7 1.3 4.3 0.4 5 80830 22 27 10 1.907 275.2 1.3 3.7 0.3 5 81806 22 43 26 1.930 274.1 2.3 4.3 0.6 5 82321 22 52 01 1.944 274.5 1.3 4.1 0.2 5 92562 01 42 42 3.010 278.6 0.7 1.0 0.3 5