53 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 22 1999 09 22 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 *** 14 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 52 007 29.61 95.17 0.0 305.8 3.1 1.5 0.7 50113 13 55 13 2.604 311.2 0.9 0.3 0.5 5 50882 14 08 02 2.346 310.3 1.0 0.5 0.3 5 51307 14 15 07 2.227 310.7 0.7 0.4 0.3 5 51792 14 23 12 2.107 309.7 0.6 0.7 0.1 5 52216 14 30 16 2.013 310.4 1.0 0.7 0.4 5 53219 14 46 59 1.828 309.0 0.5 1.3 0.2 5 53642 14 54 02 1.762 311.1 1.8 0.9 0.4 5 54211 15 03 31 1.683 310.0 1.2 1.1 0.4 5 54634 15 10 34 1.630 311.3 2.9 0.7 0.7 5 55120 15 18 40 1.575 308.7 1.8 1.1 0.4 5 56127 15 35 27 1.478 306.8 2.0 1.3 0.6 5 56549 15 42 29 1.443 307.1 1.4 1.0 0.4 5 57697 16 01 37 1.361 303.0 1.9 2.1 0.7 5 58118 16 08 38 1.336 301.4 0.8 2.5 0.3 5 58603 16 16 43 1.310 302.6 0.8 2.2 0.2 5 59751 16 35 51 1.256 304.0 2.2 1.9 0.5 5 60235 16 43 55 1.237 304.5 1.9 1.6 0.6 5 60718 16 51 58 1.221 302.0 1.1 2.2 0.3 5 61202 17 00 02 1.206 302.7 0.9 2.5 0.2 5 62150 17 15 50 1.182 302.2 1.4 2.1 0.3 5 62634 17 23 54 1.172 303.7 2.6 2.1 0.7 5 63118 17 31 58 1.164 303.5 1.8 2.3 0.4 5 63602 17 40 02 1.157 303.2 1.2 2.2 0.4 5 64550 17 55 50 1.149 302.7 1.4 2.5 0.4 5 65034 18 03 54 1.146 304.8 1.5 1.9 0.5 5 65520 18 12 00 1.146 305.9 3.0 2.0 0.7 5 66088 18 21 28 1.146 306.7 1.4 2.0 0.4 5 66508 18 28 28 1.148 302.2 1.9 2.4 0.4 5 67568 18 46 08 1.157 304.8 3.8 1.4 0.8 5 68051 18 54 11 1.163 304.3 1.3 2.0 0.4 5 68535 19 02 15 1.172 303.0 2.3 2.4 0.4 5 69019 19 10 19 1.181 300.7 0.7 2.7 0.2 5 69967 19 26 07 1.205 302.7 2.1 1.8 0.5 5 70451 19 34 11 1.220 301.3 2.1 1.9 0.6 5 70935 19 42 15 1.236 302.5 2.2 1.5 0.6 5 71418 19 50 18 1.255 301.1 1.6 1.7 0.5 5 72365 20 06 05 1.298 303.3 0.8 1.4 0.1 5 73290 20 21 30 1.349 302.1 0.9 2.1 0.2 5 73712 20 28 32 1.375 304.2 1.6 1.9 0.5 5 74859 20 47 39 1.460 305.6 2.6 1.7 0.6 5 75281 20 54 41 1.497 306.7 0.5 1.4 0.2 5 75767 21 02 47 1.544 306.0 1.9 1.7 0.5 5 76546 21 15 46 1.629 308.3 1.3 1.4 0.3 5 76969 21 22 49 1.681 307.3 1.9 1.7 0.4 5 77814 21 36 54 1.802 308.0 1.1 1.6 0.6 5 78238 21 43 58 1.872 307.7 2.8 1.5 0.6 5 78727 21 52 07 1.962 307.2 0.8 1.5 0.2 5 79974 22 12 54 2.249 309.6 1.5 1.0 0.5 5 80459 22 20 59 2.391 308.7 0.8 0.8 0.4 5 80944 22 29 04 2.553 308.4 1.1 0.7 0.3 5 81895 22 44 55 2.956 307.4 0.5 0.2 0.1 5 82317 22 51 57 3.182 306.7 0.7 -0.7 0.1 5