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 18 1997 08 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. Fairbanks 23 007 64.84 147.56 0.0 301.2 5.4 2.6 0.9 62769 17 26 09 2.684 293.0 0.6 1.2 0.3 5 63994 17 46 34 2.469 296.4 0.9 0.8 0.3 5 64508 17 55 08 2.391 296.5 2.6 0.8 0.9 5 65027 18 03 47 2.319 295.1 0.9 2.0 0.3 5 66154 18 22 34 2.181 296.1 1.1 2.1 0.4 5 66668 18 31 08 2.126 295.5 1.6 2.5 0.5 5 67182 18 39 42 2.075 294.6 3.5 2.7 0.9 5 68314 18 58 34 1.976 293.0 4.0 3.0 1.5 5 70309 19 31 49 1.839 300.5 1.5 2.1 0.3 5 70993 19 43 13 1.802 301.6 1.4 2.4 0.8 5 73406 20 23 26 1.700 316.5 2.6 1.7 1.0 5 74780 20 46 20 1.661 300.9 0.6 3.1 0.3 5 75298 20 54 58 1.650 301.8 0.3 3.3 0.2 5 75981 21 06 21 1.637 303.5 1.9 3.8 0.5 5 81733 22 42 13 1.639 304.8 1.8 3.5 0.8 5 82707 22 58 27 1.658 304.0 1.9 3.6 0.5 5 83222 23 07 02 1.671 306.2 2.2 3.1 0.7 5 83910 23 18 30 1.690 306.0 2.8 2.4 0.9 5 84883 23 34 43 1.723 303.3 1.9 3.8 0.7 5 85398 23 43 18 1.744 305.1 1.3 3.2 0.4 5 86080 23 54 40 1.774 305.4 1.0 3.0 0.5 5 87064 00 11 04 1.825 303.2 1.5 3.3 0.3 5 87583 00 19 43 1.855 304.0 1.1 3.2 0.4 5