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 16 1999 09 16 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 0.0 293.9 2.2 1.3 0.5 50002 13 53 22 2.566 291.5 1.0 0.8 0.4 5 50571 14 02 51 2.373 291.9 0.8 0.8 0.3 5 51055 14 10 55 2.233 292.5 1.2 0.7 0.4 5 51539 14 18 59 2.111 293.0 1.0 0.6 0.3 5 52961 14 42 41 1.827 293.4 1.3 0.9 0.4 5 53529 14 52 09 1.739 291.4 1.5 1.5 0.4 5 54015 15 00 15 1.672 292.2 2.7 0.9 0.8 5 54583 15 09 43 1.601 292.7 1.3 1.1 0.4 5 55151 15 19 11 1.540 292.7 0.6 0.9 0.3 5 55952 15 32 32 1.463 291.5 1.6 1.2 0.4 5 57100 15 51 40 1.374 294.2 2.8 0.8 0.7 5 57584 15 59 44 1.342 290.4 1.5 1.4 0.6 5 58151 16 09 11 1.308 291.7 1.8 1.3 0.5 5 59378 16 29 38 1.247 289.9 1.8 1.8 0.5 5 59862 16 37 42 1.227 289.9 0.9 1.7 0.2 5 60345 16 45 45 1.209 288.9 4.4 1.7 0.9 5 60829 16 53 49 1.193 290.0 1.0 1.6 0.3 5 61779 17 09 39 1.167 293.9 2.6 1.2 0.8 5 62264 17 17 44 1.156 293.8 1.1 1.1 0.2 5 62749 17 25 49 1.147 294.0 0.6 1.0 0.2 5 63233 17 33 53 1.139 295.2 2.1 1.1 0.7 5 64183 17 49 43 1.128 294.1 2.2 0.9 0.5 5 64668 17 57 48 1.124 291.6 2.9 1.9 0.7 5 65152 18 05 52 1.122 293.8 1.7 1.2 0.4 5 65636 18 13 56 1.121 296.2 2.9 1.0 0.9 5 66482 18 28 02 1.123 295.9 1.8 0.9 0.4 5 67543 18 45 43 1.130 296.5 1.2 0.7 0.5 5 68027 18 53 47 1.136 294.1 2.0 1.4 0.5 5 68512 19 01 52 1.144 295.8 2.3 1.1 0.7 5 68997 19 09 57 1.152 293.0 2.5 1.3 0.7 5 69946 19 25 46 1.174 296.0 2.7 0.9 0.5 5 70431 19 33 51 1.188 293.3 2.6 1.0 0.6 5 70915 19 41 55 1.203 294.7 2.1 1.5 0.4 5 71400 19 50 00 1.220 293.3 1.9 1.6 0.4 5 72348 20 05 48 1.259 295.1 1.3 1.6 0.7 5 72834 20 13 54 1.283 293.8 2.8 2.3 0.6 5 73983 20 33 03 1.349 294.9 1.6 2.1 0.5 5 74547 20 42 27 1.387 298.0 2.7 1.5 0.5 5 75698 21 01 38 1.481 296.1 1.9 1.8 0.5 5 76184 21 09 44 1.527 296.7 0.9 1.6 0.2 5 77204 21 26 44 1.642 296.3 1.0 2.0 0.3 5 78049 21 40 49 1.758 296.8 2.3 2.1 0.7 5 78536 21 48 56 1.835 296.9 1.6 2.1 0.3 5 79107 21 58 27 1.938 295.8 0.7 1.8 0.2 5 80632 22 23 52 2.299 295.4 1.2 1.5 0.5 5 81117 22 31 57 2.449 296.7 0.9 0.9 0.4 5 81602 22 40 02 2.624 295.6 1.5 1.0 0.4 5 82279 22 51 19 2.917 295.1 0.6 0.2 0.3 5