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 21 1999 09 21 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 0.0 287.9 2.2 1.8 0.7 50079 13 54 39 2.603 287.3 1.5 2.2 0.6 5 50650 14 04 10 2.406 286.8 1.5 2.1 0.7 5 51133 14 12 13 2.263 288.6 1.5 1.8 0.7 5 51616 14 20 16 2.138 287.0 0.9 2.2 0.2 5 52590 14 36 30 1.931 289.0 0.6 1.5 0.2 5 53013 14 43 33 1.855 287.1 0.4 1.7 0.2 5 56249 15 37 29 1.463 288.1 1.0 1.2 0.3 5 56673 15 44 33 1.429 288.2 2.1 1.2 0.3 5 57821 16 03 41 1.349 284.8 3.2 2.4 1.2 5 58243 16 10 43 1.324 285.2 3.2 2.4 1.1 5 58727 16 18 47 1.299 287.8 1.6 1.7 0.4 5 59677 16 34 37 1.255 288.0 1.5 1.6 0.3 5 60645 16 50 45 1.219 286.8 1.5 1.8 0.3 5 61128 16 58 48 1.204 286.9 1.3 1.9 0.3 5 62076 17 14 36 1.179 282.9 1.2 2.7 0.1 5 62560 17 22 40 1.169 285.1 2.1 2.2 0.6 5 63044 17 30 44 1.161 284.4 1.5 2.3 0.5 5 63528 17 38 48 1.154 285.9 1.2 1.9 0.6 5 64477 17 54 37 1.145 286.5 3.3 1.8 0.7 5 64961 18 02 41 1.143 288.1 1.8 1.5 0.5 5 65444 18 10 44 1.142 286.5 1.7 2.1 0.6 5 66288 18 24 48 1.143 286.5 2.6 2.1 0.8 5 66708 18 31 48 1.145 284.4 2.0 2.5 0.7 5 67767 18 49 27 1.155 287.7 2.3 1.8 0.5 5 68251 18 57 31 1.162 288.1 2.0 1.7 0.6 5 68735 19 05 35 1.171 286.1 3.0 2.4 0.8 5 69219 19 13 39 1.181 286.0 0.9 2.6 0.4 5 70167 19 29 27 1.205 289.1 1.7 1.6 0.3 5 70651 19 37 31 1.221 287.1 2.7 2.2 0.7 5 71134 19 45 34 1.238 289.0 0.4 1.7 0.2 5 71618 19 53 38 1.257 287.8 2.1 2.1 0.5 5 72565 20 09 25 1.302 285.5 1.6 2.5 0.5 5 73410 20 23 30 1.349 287.1 1.4 2.6 0.4 5 73832 20 30 32 1.375 287.8 0.9 2.3 0.3 5 74980 20 49 40 1.462 288.1 1.0 2.1 0.7 5 75402 20 56 42 1.499 287.9 3.0 2.2 0.8 5 75890 21 04 50 1.546 288.6 1.4 1.7 0.4 5 76643 21 17 23 1.629 289.1 0.8 1.6 0.2 5 77068 21 24 28 1.682 289.8 1.1 1.4 0.3 5 77916 21 38 36 1.804 291.7 1.2 1.1 0.5 5 78342 21 45 42 1.875 291.5 1.7 1.4 0.6 5 78832 21 53 52 1.966 291.9 0.9 1.1 0.4 5 80081 22 14 41 2.256 291.2 0.7 1.0 0.3 5 80564 22 22 44 2.399 291.6 1.3 0.8 0.4 5 81048 22 30 48 2.563 291.9 0.8 0.5 0.3 5 81997 22 46 37 2.968 292.1 1.3 -0.4 0.5 5 82418 22 53 38 3.196 290.8 1.1 -0.5 0.3 5