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 04 28 1997 04 28 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 0.0 405.9 5.1 1.7 2.2 61768 17 09 28 2.661 396.8 1.6 -2.8 1.1 5 62907 17 28 27 2.460 398.1 1.3 -1.1 0.3 5 63438 17 37 18 2.378 401.5 2.1 -1.4 0.9 5 63975 17 46 15 2.302 400.8 1.1 -0.3 0.2 5 65189 18 06 29 2.152 404.2 0.6 0.0 0.1 5 65720 18 15 20 2.095 404.3 1.9 0.5 0.6 5 66251 18 24 11 2.043 405.1 1.3 0.8 0.4 5 68846 19 07 26 1.838 408.0 1.4 0.7 0.3 5 69583 19 19 43 1.793 406.6 0.9 1.2 0.2 5 70114 19 28 34 1.764 408.6 1.9 1.4 0.6 5 70846 19 40 46 1.727 407.9 1.7 2.4 0.5 5 71577 19 52 57 1.696 407.1 1.6 2.8 0.5 5 72109 20 01 49 1.675 408.4 2.1 3.0 0.8 5 72843 20 14 03 1.649 406.2 1.5 3.7 0.3 5 73576 20 26 16 1.628 406.2 2.1 4.0 0.5 5 74107 20 35 07 1.613 406.2 1.4 4.7 0.4 5 74840 20 47 20 1.598 411.4 2.0 4.2 0.7 5 75571 20 59 31 1.585 411.9 2.3 4.8 1.0 5 76103 21 08 23 1.577 412.8 1.5 4.6 0.6 5 83048 23 04 08 1.619 414.1 1.2 1.9 0.4 5 84082 23 21 22 1.648 413.4 1.6 2.2 0.3 5 84614 23 30 14 1.666 411.0 2.4 2.6 0.7 5 85346 23 42 26 1.694 408.5 2.6 2.8 0.8 5 86381 23 59 41 1.740 404.5 1.3 3.0 0.4 5 86915 00 08 35 1.767 404.7 2.7 2.9 0.5 5 87653 00 20 53 1.809 403.3 2.7 2.3 0.5 5 88693 00 38 13 1.876 399.9 3.0 2.3 0.7 5 89231 00 47 11 1.916 400.6 1.1 2.1 0.4 5 89968 00 59 28 1.975 402.9 1.0 1.7 0.5 5 96931 02 55 31 3.047 394.1 1.6 -3.0 0.2 5