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 07 17 1997 07 17 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 30 007 64.84 147.56 0.0 305.8 1.9 4.9 1.5 58703 16 18 23 2.687 306.7 0.4 1.1 0.1 5 59923 16 38 43 2.463 307.2 1.8 1.8 0.4 5 60437 16 47 17 2.380 305.8 1.8 2.5 0.5 5 60952 16 55 52 2.302 305.3 1.1 2.9 0.5 5 62079 17 14 39 2.152 305.5 1.1 3.2 0.3 5 62593 17 23 13 2.091 305.4 1.8 3.3 0.5 5 63107 17 31 47 2.034 304.2 1.7 3.9 0.4 5 65231 18 07 11 1.836 306.6 1.1 3.3 0.4 5 65918 18 18 38 1.783 305.4 0.8 4.1 0.4 5 66432 18 27 12 1.746 308.9 1.2 3.9 0.6 5 67114 18 38 34 1.702 306.2 2.3 4.7 0.7 5 67796 18 49 56 1.661 304.8 1.5 5.4 0.4 5 68311 18 58 31 1.633 305.3 3.3 5.7 1.0 5 68993 19 09 53 1.598 304.8 1.2 5.8 0.2 5 69674 19 21 14 1.567 304.5 1.4 6.2 0.4 5 70188 19 29 48 1.545 301.7 2.7 7.4 0.7 5 71892 19 58 12 1.484 307.8 3.4 4.3 0.9 5 72866 20 14 26 1.456 306.2 1.4 5.4 0.3 5 73379 20 22 59 1.444 307.1 2.0 5.1 0.8 5 74061 20 34 21 1.429 306.5 1.3 5.2 0.5 5 75035 20 50 35 1.411 306.7 2.2 5.3 0.8 5 75547 20 59 07 1.403 306.5 1.6 5.2 0.4 5 76229 21 10 29 1.395 307.0 1.8 5.3 0.3 5 77716 21 35 16 1.383 304.6 1.4 6.2 0.3 5 78402 21 46 42 1.381 302.4 1.1 6.3 0.3 5 79380 22 03 00 1.381 303.1 3.1 6.5 0.7 5 81562 22 39 22 1.393 304.8 1.5 5.9 0.6 5 83738 23 15 38 1.426 310.5 2.0 6.1 0.4 5 84712 23 31 52 1.448 309.1 1.7 6.6 0.3 5 85231 23 40 31 1.461 303.5 2.0 7.0 0.5 5