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 20 1999 09 20 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 41 007 29.61 95.17 0.0 290.1 1.6 1.9 0.6 50047 13 54 07 2.601 289.3 0.5 1.0 0.2 5 50615 14 03 35 2.405 290.0 1.4 1.1 0.4 5 51101 14 11 41 2.261 289.8 1.7 1.4 0.4 5 51585 14 19 45 2.136 289.4 1.4 1.7 0.5 5 53132 14 45 32 1.827 290.0 0.6 0.9 0.3 5 53702 14 55 02 1.740 290.8 0.2 1.0 0.2 5 54189 15 03 09 1.674 287.4 0.8 1.8 0.4 5 54757 15 12 37 1.604 290.8 2.1 1.3 0.5 5 55326 15 22 06 1.542 289.5 1.6 1.9 0.4 5 56008 15 33 28 1.478 290.3 2.0 2.7 0.4 5 57903 16 05 03 1.340 290.1 2.3 3.1 0.8 5 59434 16 30 34 1.261 289.5 1.3 1.9 0.3 5 59918 16 38 38 1.241 290.5 1.5 2.1 0.3 5 60401 16 46 41 1.223 286.4 2.0 2.7 0.6 5 60885 16 54 45 1.207 285.4 1.3 3.4 0.5 5 61831 17 10 31 1.181 289.4 1.3 1.9 0.4 5 62315 17 18 35 1.170 287.9 1.9 2.5 0.5 5 62799 17 26 39 1.161 289.1 2.4 1.8 0.7 5 63283 17 34 43 1.154 289.3 2.3 1.8 0.5 5 64231 17 50 31 1.143 288.9 1.8 2.4 0.4 5 64715 17 58 35 1.139 290.4 3.7 2.1 0.7 5 65199 18 06 39 1.138 289.1 1.6 1.9 0.5 5 65682 18 14 42 1.137 290.1 1.5 2.2 0.6 5 66248 18 24 08 1.138 291.2 1.6 2.1 0.3 5 67309 18 41 49 1.145 292.6 2.9 1.8 0.8 5 67792 18 49 52 1.151 289.8 2.0 2.2 0.6 5 68276 18 57 56 1.158 289.1 1.9 2.1 0.5 5 68760 19 06 00 1.166 291.0 1.4 1.7 0.5 5 69597 19 19 57 1.185 293.0 4.7 2.6 1.0 5 70015 19 26 55 1.196 292.3 2.4 3.2 0.7 5 71495 19 51 35 1.246 292.3 1.9 3.0 0.4 5 74704 20 45 04 1.430 292.7 3.1 1.9 0.9 5 75852 21 04 12 1.532 292.2 2.0 2.2 0.5 5 76805 21 20 05 1.637 291.6 2.3 2.0 0.8 5 77650 21 34 10 1.750 290.3 1.2 2.2 0.6 5 78139 21 42 19 1.826 291.2 0.8 1.5 0.3 5 78710 21 51 50 1.926 292.0 1.3 1.3 0.2 5 80234 22 17 14 2.277 290.8 1.6 1.6 0.4 5 80719 22 25 19 2.422 291.1 1.3 0.7 0.3 5 81207 22 33 27 2.592 289.6 0.3 1.1 0.1 5 81880 22 44 40 2.874 289.0 1.2 1.1 0.3 5