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 25 1997 07 25 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 0.0 287.5 2.6 5.6 1.3 63394 17 36 34 2.095 277.0 3.9 4.4 2.5 5 67334 18 42 14 1.750 285.3 4.3 3.9 1.2 5 68707 19 05 07 1.667 288.4 4.0 3.4 1.4 5 69226 19 13 46 1.640 285.4 3.2 5.0 0.9 5 69911 19 25 11 1.607 287.2 1.3 5.1 0.6 5 70598 19 36 38 1.577 287.3 1.1 4.9 0.2 5 71117 19 45 17 1.557 287.1 0.8 5.3 0.2 5 73424 20 23 44 1.485 288.6 1.2 4.2 0.4 5 74403 20 40 03 1.463 288.3 1.5 4.9 0.4 5 74921 20 48 41 1.453 286.2 0.9 5.6 0.3 5 75606 21 00 06 1.442 288.5 3.0 5.7 0.7 5 76584 21 16 24 1.430 288.8 1.5 5.9 0.6 5 77102 21 25 02 1.425 289.0 1.5 6.1 0.4 5 77788 21 36 28 1.421 290.0 1.5 6.1 0.4 5 78765 21 52 45 1.418 286.2 0.5 6.8 0.2 5 79283 22 01 23 1.418 290.0 2.0 6.6 0.6 5 80260 22 17 40 1.421 286.4 3.9 7.2 0.7 5 80778 22 26 18 1.424 289.6 2.7 6.6 0.6 5 82442 22 54 02 1.443 287.1 2.0 7.2 0.4 5 82960 23 02 40 1.451 287.6 1.4 7.0 0.6 5 83646 23 14 06 1.464 287.9 1.3 7.3 0.4 5 84624 23 30 24 1.487 286.1 3.7 7.2 0.9 5 85142 23 39 02 1.501 286.7 1.0 7.1 0.2 5 85829 23 50 29 1.521 285.1 2.9 7.4 0.6 5 86840 24 07 20 1.556 284.4 1.3 7.4 0.4 5 88369 00 32 49 1.621 290.8 1.7 4.1 0.4 5 89348 00 49 08 1.672 289.9 1.2 4.4 0.3 5 89867 00 57 47 1.701 288.9 1.7 4.6 0.5 5 90554 01 09 14 1.744 288.9 0.9 4.3 0.3 5 92740 01 45 40 1.911 291.1 2.4 3.7 1.0 5