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 12 1999 09 12 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 0.0 293.2 3.4 0.6 1.0 47779 13 16 19 3.679 291.9 1.6 -2.5 1.0 5 49434 13 43 54 2.724 295.7 0.4 -0.8 0.1 5 50644 14 04 04 2.300 294.0 1.4 -0.1 0.4 5 51127 14 12 07 2.168 294.0 1.2 0.0 0.3 5 51696 14 21 36 2.033 294.5 2.0 -0.1 0.7 5 52182 14 29 42 1.933 293.3 0.9 0.4 0.4 5 52775 14 39 35 1.826 293.2 0.8 0.2 0.2 5 53159 14 45 59 1.764 295.2 0.6 -0.2 0.2 5 54704 15 11 44 1.562 294.7 3.0 -0.1 0.9 5 56353 15 39 13 1.408 292.9 1.0 0.3 0.4 5 56838 15 47 18 1.372 292.4 2.4 0.7 0.6 5 57431 15 57 11 1.332 292.8 1.5 0.4 0.3 5 62079 17 14 39 1.143 291.8 1.5 0.5 0.4 5 63282 17 34 42 1.121 290.5 1.6 0.8 0.4 5 63767 17 42 47 1.115 273.8 3.4 4.3 0.9 5 64332 17 52 12 1.109 290.4 0.5 0.8 0.2 5 64815 18 00 15 1.106 291.1 1.9 0.6 0.4 5 65410 18 10 10 1.104 291.1 1.2 0.7 0.4 5 65893 18 18 13 1.103 292.5 0.4 0.8 0.2 5 66459 18 27 39 1.104 291.9 1.4 0.8 0.4 5 66942 18 35 42 1.106 290.9 1.8 0.8 0.6 5 67536 18 45 36 1.111 289.6 1.9 1.1 0.4 5 68019 18 53 39 1.116 292.6 1.3 1.0 0.4 5 68585 19 03 05 1.124 291.3 1.7 1.4 0.6 5 69068 19 11 08 1.132 291.7 1.4 0.9 0.3 5 70146 19 29 06 1.157 293.0 1.4 0.8 0.4 5 70711 19 38 31 1.172 292.1 2.5 1.4 0.4 5 71195 19 46 35 1.188 291.5 3.9 1.3 0.8 5 71788 19 56 28 1.209 292.2 4.0 1.7 1.1 5 72838 20 13 58 1.254 294.1 3.5 1.2 1.0 5 73322 20 22 02 1.279 294.5 1.3 0.9 0.2 5 73915 20 31 55 1.312 294.2 2.2 1.2 0.7 5 74402 20 40 02 1.342 292.6 0.8 1.2 0.3 5 74968 20 49 28 1.382 292.5 3.6 1.6 1.1 5 75455 20 57 35 1.419 294.9 1.8 0.7 0.3 5 76050 21 07 30 1.470 294.6 1.1 0.8 0.2 5 76538 21 15 38 1.518 294.7 1.3 0.7 0.4 5 77108 21 25 08 1.578 296.0 1.6 0.6 0.5 5 77724 21 35 24 1.654 295.4 1.4 0.9 0.4 5 78214 21 43 34 1.720 295.9 1.6 0.7 0.3 5 78784 21 53 04 1.808 295.8 1.2 0.7 0.4 5 79274 22 01 14 1.893 296.4 1.7 0.8 0.5 5 79868 22 11 08 2.011 297.2 2.2 0.4 0.5 5 80351 22 19 11 2.121 296.8 1.2 0.3 0.2 5 80919 22 28 39 2.270 296.7 1.3 0.4 0.4 5 81402 22 36 42 2.417 297.1 0.8 0.1 0.1 5 81991 22 46 31 2.627 296.2 1.0 0.0 0.6 5 83767 23 16 07 3.590 294.0 2.1 -2.4 1.9 5