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 18 1999 09 18 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 47 007 29.61 95.17 0.0 288.6 1.7 2.0 0.7 49986 13 53 06 2.597 289.8 1.8 0.3 0.4 5 50555 14 02 35 2.400 289.1 1.2 0.7 0.4 5 51489 14 18 09 2.140 289.2 0.7 0.7 0.3 5 53044 14 44 04 1.827 287.9 1.2 1.6 0.6 5 53612 14 53 32 1.740 287.3 1.6 1.7 0.5 5 54098 15 01 38 1.673 289.5 1.2 1.3 0.2 5 54666 15 11 06 1.603 288.3 0.6 1.4 0.2 5 55234 15 20 34 1.542 288.3 1.5 1.3 0.5 5 55911 15 31 51 1.477 288.5 2.2 1.3 0.6 5 57059 15 50 59 1.385 288.2 1.5 1.6 0.5 5 57543 15 59 03 1.353 287.8 1.1 1.4 0.3 5 58110 16 08 30 1.319 287.6 1.6 1.4 0.5 5 59337 16 28 57 1.257 288.0 1.2 2.1 0.4 5 59821 16 37 01 1.237 288.5 1.4 2.1 0.4 5 60305 16 45 05 1.218 288.8 1.4 1.8 0.5 5 60788 16 53 08 1.202 289.1 2.2 1.9 0.5 5 61736 17 08 56 1.176 287.2 2.2 2.0 0.6 5 62219 17 16 59 1.165 289.2 1.3 1.9 0.5 5 62703 17 25 03 1.155 288.8 1.1 1.8 0.2 5 63187 17 33 07 1.147 288.7 0.9 2.1 0.4 5 64135 17 48 55 1.136 287.7 3.5 3.1 0.8 5 64619 17 56 59 1.132 285.8 1.1 3.4 0.3 5 65102 18 05 02 1.130 286.0 1.6 3.9 0.4 5 65586 18 13 06 1.128 286.0 2.0 3.9 0.4 5 66430 18 27 10 1.130 287.1 1.6 2.9 0.5 5 67490 18 44 50 1.138 288.0 1.3 2.2 0.2 5 67973 18 52 53 1.144 285.2 0.8 2.5 0.2 5 68457 19 00 57 1.151 287.1 2.6 1.9 0.7 5 68941 19 09 01 1.160 286.7 0.8 1.9 0.4 5 69889 19 24 49 1.183 287.6 1.9 2.3 0.7 5 70372 19 32 52 1.196 288.0 1.3 1.9 0.5 5 70856 19 40 56 1.211 287.7 2.1 2.3 0.6 5 71340 19 49 00 1.228 287.4 2.5 1.8 0.7 5 72287 20 04 47 1.268 287.2 1.8 2.3 0.6 5 72771 20 12 51 1.292 287.5 0.4 2.3 0.2 5 73760 20 29 20 1.349 288.2 1.4 2.2 0.3 5 74907 20 48 27 1.430 289.9 1.3 2.4 0.4 5 75392 20 56 32 1.471 289.5 1.8 2.5 0.5 5 75960 21 06 00 1.524 288.0 3.5 2.7 0.6 5 76920 21 22 00 1.629 292.3 1.6 1.9 0.5 5 77765 21 36 05 1.741 291.8 1.3 2.3 0.3 5 78252 21 44 12 1.816 291.3 1.9 2.4 0.5 5 78823 21 53 43 1.916 291.8 1.2 2.0 0.2 5 80350 22 19 10 2.264 292.4 2.0 2.0 0.8 5 80839 22 27 19 2.409 292.3 1.4 1.6 0.5 5 81324 22 35 24 2.576 291.7 0.9 1.3 0.4 5 82276 22 51 16 2.992 290.1 0.9 1.0 0.2 5