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 05 12 1997 05 12 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 24 007 64.84 147.56 0.0 340.6 5.4 1.5 1.0 59696 16 34 56 2.658 339.1 1.0 -0.6 0.2 5 60806 16 53 26 2.456 339.6 3.0 -0.2 0.3 5 61867 17 11 07 2.294 340.8 3.7 -1.0 1.9 5 63079 17 31 19 2.137 337.0 1.0 1.0 0.3 5 63610 17 40 10 2.077 336.2 1.0 1.2 0.2 5 64145 17 49 05 2.020 337.9 0.6 0.9 0.4 5 66241 18 24 01 1.836 337.5 1.0 1.2 0.3 5 66979 18 36 19 1.783 336.3 1.7 2.0 0.4 5 67516 18 45 16 1.748 336.8 2.6 1.8 0.7 5 68255 18 57 35 1.704 335.5 1.7 2.1 0.4 5 68992 19 09 52 1.665 336.7 2.4 2.1 0.7 5 69529 19 18 49 1.638 336.3 1.5 2.0 0.6 5 70268 19 31 08 1.605 337.3 2.2 2.2 0.9 5 71006 19 43 26 1.576 334.5 3.9 3.0 1.1 5 71541 19 52 21 1.557 337.6 4.7 2.6 0.8 5 74298 20 38 18 1.485 339.1 1.9 2.2 0.7 5 76612 21 16 52 1.455 341.0 1.8 2.1 0.5 5 77650 21 34 10 1.449 341.0 2.0 3.3 0.5 5 78186 21 43 06 1.448 345.0 1.9 2.2 0.4 5 78928 21 55 28 1.448 344.8 1.5 2.4 0.3 5 87964 00 26 04 1.671 350.5 1.9 1.2 0.5 5 88500 00 35 00 1.700 350.8 1.3 1.4 0.8 5 90273 01 04 33 1.813 352.2 2.3 0.9 0.7 5 90809 01 13 29 1.853 351.8 4.5 1.1 1.5 5