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 15 1999 09 15 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 0.0 294.9 1.5 1.1 0.6 49891 13 51 31 2.594 293.1 1.0 0.2 0.3 5 50460 14 01 00 2.397 294.1 0.8 0.0 0.2 5 51395 14 16 35 2.136 295.2 1.5 0.0 0.2 5 52920 14 42 00 1.827 294.5 1.5 0.8 0.5 5 53489 14 51 29 1.739 294.9 1.2 0.7 0.4 5 53975 14 59 35 1.671 292.6 1.6 1.1 0.3 5 54543 15 09 03 1.601 295.0 1.7 0.5 0.5 5 55735 15 28 55 1.478 295.5 2.5 0.5 0.6 5 56883 15 48 03 1.385 293.4 1.4 1.1 0.5 5 57368 15 56 08 1.351 292.0 1.2 1.6 0.3 5 57935 16 05 35 1.316 293.1 2.6 1.2 0.7 5 59162 16 26 02 1.253 293.3 1.2 0.8 0.2 5 59646 16 34 06 1.232 294.6 2.2 0.3 0.4 5 60129 16 42 09 1.213 293.7 0.8 0.7 0.3 5 60613 16 50 13 1.197 292.3 1.4 1.0 0.4 5 61561 17 06 01 1.169 292.1 1.9 1.0 0.5 5 62047 17 14 07 1.158 294.1 1.2 1.1 0.4 5 62532 17 22 12 1.147 296.6 1.9 0.5 0.5 5 63017 17 30 17 1.139 296.6 2.9 0.7 0.4 5 63966 17 46 06 1.126 297.3 2.8 0.4 0.8 5 64451 17 54 11 1.122 296.7 2.3 0.8 0.9 5 64936 18 02 16 1.119 294.5 2.9 1.5 0.8 5 65420 18 10 20 1.118 293.7 0.9 2.4 0.3 5 66265 18 24 25 1.118 295.1 1.4 2.7 0.5 5 67327 18 42 07 1.124 295.1 1.4 1.8 0.4 5 67812 18 50 12 1.129 296.8 2.3 1.6 0.7 5 68238 18 57 18 1.135 296.0 0.4 1.6 0.3 5 68933 19 08 53 1.147 295.0 1.5 1.5 0.6 5 69993 19 26 33 1.171 293.1 0.7 1.7 0.2 5 70478 19 34 38 1.184 295.3 3.3 1.1 0.8 5 70962 19 42 42 1.199 296.9 2.7 0.9 0.6 5 71447 19 50 47 1.216 297.5 1.9 1.0 0.5 5 72395 20 06 35 1.256 296.7 1.4 1.6 0.4 5 72880 20 14 40 1.279 297.3 2.7 1.2 0.8 5 73365 20 22 45 1.305 296.0 2.0 1.3 0.6 5 74091 20 34 51 1.349 296.1 1.4 1.3 0.3 5 75240 20 54 00 1.433 296.5 3.1 1.9 0.9 5 75726 21 02 06 1.475 298.1 1.8 1.6 0.8 5 76295 21 11 35 1.529 295.4 1.8 2.4 0.7 5 77252 21 27 32 1.637 295.0 1.2 1.6 0.4 5 78097 21 41 37 1.752 293.6 0.9 1.5 0.2 5 78584 21 49 44 1.829 294.2 2.7 0.9 0.7 5 79153 21 59 13 1.931 293.6 1.4 1.9 0.3 5 80680 22 24 40 2.290 294.9 0.9 0.9 0.2 5 81165 22 32 45 2.439 295.2 1.6 0.5 0.5 5 81650 22 40 50 2.612 293.5 1.4 0.6 0.6 5 82325 22 52 05 2.902 293.6 1.5 0.1 0.9 5