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 23 1997 08 23 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 20 007 64.84 147.56 0.0 288.4 3.0 2.6 1.3 64838 18 00 38 2.472 284.8 2.2 0.3 0.9 5 65357 18 09 17 2.396 285.4 1.8 0.8 0.7 5 65877 18 17 57 2.326 283.8 1.7 1.4 0.5 5 69155 19 12 35 1.997 286.2 4.4 2.6 0.8 5 71671 19 54 31 1.840 291.6 1.7 2.0 0.5 5 72359 20 05 59 1.808 291.9 1.7 2.0 0.4 5 72879 20 14 39 1.786 290.9 1.6 1.9 0.4 5 73566 20 26 06 1.761 291.4 2.2 2.0 0.5 5 74254 20 37 34 1.739 291.6 2.1 2.0 0.5 5 74773 20 46 13 1.725 291.9 3.8 1.9 1.0 5 75459 20 57 39 1.710 291.1 2.2 2.1 0.5 5 76146 21 09 06 1.697 290.6 1.8 2.5 0.6 5 76664 21 17 44 1.689 286.6 3.2 3.6 0.7 5 77346 21 29 06 1.682 289.4 1.9 3.8 0.5 5 78029 21 40 29 1.677 289.7 1.1 3.8 0.3 5 78543 21 49 03 1.677 289.2 0.7 3.8 0.3 5 83560 23 12 40 1.750 283.2 0.8 4.6 0.3 5 84541 23 29 01 1.784 285.8 2.5 3.9 0.9 5 85060 23 37 40 1.805 284.3 1.6 5.3 0.3 5 95423 02 30 23 3.024 288.8 1.8 0.8 0.7 5