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 17 1999 09 17 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 0.0 289.7 1.5 2.1 0.8 49952 13 52 32 2.597 288.4 1.1 0.8 0.3 5 50520 14 02 00 2.400 288.9 0.6 0.8 0.2 5 51005 14 10 05 2.256 289.1 0.8 1.0 0.3 5 51490 14 18 10 2.131 289.2 1.5 0.9 0.4 5 53004 14 43 24 1.827 287.5 1.4 1.2 0.2 5 53574 14 52 54 1.739 287.8 0.6 1.1 0.2 5 54061 15 01 01 1.672 288.4 1.6 1.2 0.3 5 54629 15 10 29 1.602 289.1 2.0 1.0 0.5 5 55197 15 19 57 1.540 287.7 1.7 1.6 0.3 5 55874 15 31 14 1.475 288.9 2.0 1.5 0.5 5 57021 15 50 21 1.384 286.6 3.1 2.0 0.5 5 57506 15 58 26 1.351 286.2 0.5 2.0 0.2 5 58073 16 07 53 1.317 286.9 1.8 1.8 0.1 5 59300 16 28 20 1.254 289.5 1.1 1.9 0.4 5 59784 16 36 24 1.234 288.2 1.6 2.1 0.6 5 60267 16 44 27 1.216 288.3 1.3 2.1 0.4 5 60751 16 52 31 1.200 288.1 1.7 2.1 0.5 5 61699 17 08 19 1.173 287.4 2.1 2.4 0.6 5 62183 17 16 23 1.162 287.8 1.6 2.3 0.4 5 62667 17 24 27 1.152 289.8 1.3 1.8 0.3 5 63150 17 32 30 1.144 289.2 1.5 2.2 0.5 5 64098 17 48 18 1.132 291.4 0.6 1.6 0.3 5 64582 17 56 22 1.128 289.8 1.0 2.0 0.2 5 65065 18 04 25 1.126 290.6 1.9 1.9 0.4 5 65549 18 12 29 1.125 289.5 3.8 1.7 0.7 5 66393 18 26 33 1.126 289.2 0.9 2.2 0.2 5 67453 18 44 13 1.134 290.4 1.7 2.4 0.5 5 67936 18 52 16 1.139 289.4 1.5 2.5 0.3 5 68420 19 00 20 1.146 291.3 0.7 2.1 0.2 5 68903 19 08 23 1.155 290.6 2.2 2.7 0.7 5 69851 19 24 11 1.176 291.6 1.0 2.3 0.3 5 70335 19 32 15 1.190 292.5 1.8 2.3 0.4 5 70819 19 40 19 1.205 291.1 1.4 3.0 0.4 5 71302 19 48 22 1.222 291.8 1.3 3.7 0.7 5 72248 20 04 08 1.261 291.0 1.3 3.8 0.3 5 72732 20 12 12 1.284 291.7 1.8 4.5 0.8 5 73872 20 31 12 1.349 291.1 2.3 4.4 0.8 5 75019 20 50 19 1.431 291.2 1.6 2.6 0.8 5 75504 20 58 24 1.472 290.9 1.8 1.9 0.3 5 76072 21 07 52 1.525 290.4 2.0 2.1 0.5 5 77119 21 25 19 1.642 291.7 2.2 2.5 0.5 5 77967 21 39 27 1.758 290.9 0.6 2.3 0.4 5 78456 21 47 36 1.836 290.8 1.0 2.1 0.4 5 79027 21 57 07 1.938 289.7 1.1 2.2 0.6 5 80551 22 22 31 2.298 290.5 1.3 2.2 0.2 5 81039 22 30 39 2.449 290.2 0.7 1.9 0.2 5 81523 22 38 43 2.623 290.5 1.3 1.4 0.4 5 82196 22 49 56 2.914 290.5 0.5 1.0 0.2 5