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 19 1999 09 19 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 48 007 29.61 95.17 0.0 291.5 2.0 2.7 1.0 50015 13 53 35 2.600 292.5 0.6 1.1 0.2 5 50585 14 03 05 2.402 291.1 1.5 1.5 0.6 5 51070 14 11 10 2.259 291.3 0.9 1.8 0.3 5 51554 14 19 14 2.134 292.7 1.0 1.5 0.4 5 53086 14 44 46 1.827 291.9 1.5 1.6 0.4 5 53655 14 54 15 1.740 290.2 1.1 2.8 0.4 5 54141 15 02 21 1.674 291.7 1.3 3.0 0.5 5 54709 15 11 49 1.604 290.4 1.9 2.8 0.6 5 55277 15 21 17 1.542 290.9 1.0 2.6 0.2 5 55954 15 32 34 1.478 290.6 0.9 2.7 0.4 5 57102 15 51 42 1.387 289.0 1.9 2.7 0.5 5 57586 15 59 46 1.355 290.9 1.2 2.3 0.3 5 58153 16 09 13 1.321 289.7 1.5 2.7 0.5 5 59380 16 29 40 1.259 290.5 1.6 2.7 0.5 5 59864 16 37 44 1.239 291.0 2.2 2.9 0.5 5 60348 16 45 48 1.221 290.3 0.8 3.5 0.3 5 60831 16 53 51 1.205 290.9 1.6 3.0 0.5 5 61779 17 09 39 1.179 291.1 1.1 4.6 0.5 5 62263 17 17 43 1.167 290.2 1.3 5.4 0.5 5 62747 17 25 47 1.158 292.7 2.7 5.4 0.9 5 63230 17 33 50 1.150 292.4 1.7 4.3 0.7 5 64179 17 49 39 1.139 292.0 2.9 4.0 0.6 5 64663 17 57 43 1.136 290.7 0.6 3.5 0.4 5 65146 18 05 46 1.133 289.8 1.8 3.7 0.2 5 65630 18 13 50 1.133 290.1 1.3 3.0 0.4 5 66196 18 23 16 1.133 289.8 2.9 2.8 0.9 5 67256 18 40 56 1.140 288.8 3.0 2.3 0.6 5 67740 18 49 00 1.145 289.2 2.2 2.5 0.7 5 68223 18 57 03 1.152 289.3 1.5 2.6 0.5 5 68707 19 05 07 1.160 289.1 1.5 2.7 0.3 5 69655 19 20 55 1.182 287.6 1.7 2.7 0.5 5 70139 19 28 59 1.194 288.7 1.2 2.2 0.3 5 70622 19 37 02 1.209 288.9 2.7 2.5 0.7 5 71106 19 45 06 1.225 290.9 2.4 2.4 0.7 5 72053 20 00 53 1.264 290.3 1.9 2.9 0.6 5 72537 20 08 57 1.287 292.4 0.9 2.6 0.2 5 73645 20 27 25 1.349 293.1 0.9 3.2 0.4 5 74793 20 46 33 1.430 293.9 0.4 2.5 0.2 5 75278 20 54 38 1.470 294.0 1.7 2.2 0.4 5 75846 21 04 06 1.522 294.3 1.6 2.3 0.2 5 76828 21 20 28 1.629 295.1 2.3 3.5 0.5 5 77673 21 34 33 1.740 293.5 1.8 3.5 0.7 5 78054 21 40 54 1.798 294.2 1.3 2.9 0.6 5 78903 21 55 03 1.947 294.6 0.9 2.4 0.2 5 80427 22 20 27 2.309 296.0 1.6 1.5 0.4 5 80912 22 28 32 2.460 294.9 1.8 1.3 0.7 5 81398 22 36 38 2.635 293.6 1.5 0.7 0.5 5 82075 22 47 55 2.930 293.7 0.4 0.2 0.2 5