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 Ellington ( 29.61, 95.17) ACCENT 1 1 1999 09 11 1999 09 11 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. Ellington 76 007 29.61 95.17 0.0 295.3 1.8 0.8 0.7 47769 13 16 09 3.663 292.4 1.7 -2.2 0.7 5 52244 14 30 44 1.914 297.0 1.1 0.1 0.4 5 52733 14 38 53 1.826 296.8 0.9 0.3 0.3 5 53301 14 48 21 1.736 295.1 2.5 1.1 0.6 5 53787 14 56 27 1.668 297.3 1.6 0.5 0.4 5 54379 15 06 19 1.594 297.2 2.1 0.7 0.4 5 54865 15 14 25 1.540 297.8 2.0 0.6 0.7 5 55433 15 23 53 1.483 296.7 1.5 0.9 0.4 5 55918 15 31 58 1.440 296.5 1.8 0.5 0.6 5 56511 15 41 51 1.392 297.6 2.5 0.4 0.5 5 56995 15 49 55 1.357 294.8 0.5 0.8 0.5 5 57562 15 59 22 1.320 294.5 0.6 1.1 0.3 5 58047 16 07 27 1.291 294.3 1.1 0.9 0.3 5 58639 16 17 19 1.260 295.5 3.1 0.7 0.9 5 59123 16 25 23 1.237 293.4 1.2 1.1 0.4 5 59689 16 34 49 1.213 294.0 1.2 1.2 0.5 5 60173 16 42 53 1.195 294.1 1.7 0.9 0.4 5 60766 16 52 46 1.175 296.0 1.6 1.0 0.4 5 61249 17 00 49 1.161 296.7 1.9 0.6 0.7 5 61815 17 10 15 1.146 295.3 0.8 0.8 0.4 5 62298 17 18 18 1.135 295.5 0.7 0.9 0.2 5 62892 17 28 12 1.124 295.1 2.2 1.1 0.4 5 63376 17 36 16 1.117 293.4 1.4 1.5 0.4 5 64090 17 48 10 1.108 295.3 2.7 1.1 0.7 5 64573 17 56 13 1.104 292.5 1.6 1.7 0.3 5 65139 18 05 39 1.101 292.7 1.5 1.4 0.4 5 65622 18 13 42 1.100 293.0 0.9 1.4 0.2 5 66216 18 23 36 1.100 294.1 1.4 1.4 0.4 5 66699 18 31 39 1.102 295.0 1.2 0.9 0.5 5 67265 18 41 05 1.105 294.2 2.3 1.3 0.6 5 67748 18 49 08 1.110 295.3 1.2 1.2 0.3 5 68342 18 59 02 1.117 296.2 1.7 1.0 0.5 5 68825 19 07 05 1.124 296.7 2.0 1.0 0.5 5 69390 19 16 30 1.135 294.7 1.1 1.2 0.2 5 69874 19 24 34 1.145 296.3 1.4 0.6 0.3 5 70524 19 35 24 1.163 295.1 2.6 0.9 0.8 5 71007 19 43 27 1.177 293.9 1.4 1.0 0.5 5 71573 19 52 53 1.196 295.4 1.5 0.9 0.5 5 72056 20 00 56 1.214 294.5 0.9 1.0 0.3 5 72649 20 10 49 1.240 295.7 1.3 1.1 0.2 5 73133 20 18 53 1.263 294.6 1.2 1.2 0.4 5 73699 20 28 19 1.293 295.3 1.2 1.1 0.4 5 74183 20 36 23 1.322 296.6 1.4 0.5 0.4 5 74776 20 46 16 1.361 295.7 1.9 0.8 0.5 5 75261 20 54 21 1.397 296.5 1.8 1.1 0.3 5 75789 21 03 09 1.440 297.2 2.4 0.7 0.9 5 137115 14 05 15 2.270 298.8 1.1 0.2 0.1 5 137599 14 13 19 2.141 299.7 1.0 -0.1 0.3 5 138167 14 22 47 2.010 298.4 1.7 0.4 0.5 5 138656 14 30 56 1.912 298.3 1.4 0.2 0.5 5 139249 14 40 49 1.807 296.8 2.2 0.5 0.5 5 139738 14 48 58 1.731 297.2 1.3 0.4 0.4 5 140305 14 58 25 1.652 297.2 2.2 0.6 0.4 5 140792 15 06 32 1.593 296.4 0.7 0.7 0.1 5 141384 15 16 24 1.528 297.3 1.2 0.4 0.3 5 141869 15 24 29 1.480 294.9 1.2 1.0 0.3 5 142436 15 33 56 1.430 295.6 2.0 0.7 0.4 5 142921 15 42 01 1.391 295.6 1.4 0.6 0.3 5 144376 16 06 16 1.295 295.3 1.2 1.0 0.5 5 144860 16 14 20 1.269 294.9 1.4 1.0 0.4 5 145453 16 24 13 1.240 295.4 1.6 0.7 0.3 5 145937 16 32 17 1.219 295.0 1.2 0.9 0.3 5 146503 16 41 43 1.197 294.6 1.5 0.8 0.5 5 146986 16 49 46 1.181 293.5 2.5 1.0 0.7 5 147579 16 59 39 1.163 293.6 2.3 1.0 0.5 5 148630 17 17 10 1.137 291.2 4.4 1.3 1.0 5 149114 17 25 14 1.127 292.2 2.3 1.4 0.6 5 149708 17 35 08 1.118 291.8 3.8 1.5 1.2 5 153779 18 42 59 1.106 295.0 1.3 1.2 0.2 5 154827 19 00 27 1.118 291.5 0.9 1.8 0.2 5 155311 19 08 31 1.126 293.8 0.8 1.2 0.3 5 155905 19 18 25 1.137 295.5 2.1 1.6 0.4 5 156388 19 26 28 1.149 296.6 1.5 1.2 0.2 5 156954 19 35 54 1.163 296.4 2.6 1.2 0.7 5 157402 19 43 22 1.177 296.8 2.3 1.2 0.5 5 170298 23 18 18 3.634 291.7 1.5 -2.9 0.6 5