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 14 1999 09 14 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 41 007 29.61 95.17 0.0 285.9 1.4 1.6 0.7 49857 13 50 57 2.594 285.5 0.7 0.4 0.4 5 50425 14 00 25 2.397 286.7 0.6 0.2 0.4 5 50908 14 08 28 2.253 284.9 1.3 0.8 0.4 5 51391 14 16 31 2.128 285.9 1.4 0.5 0.3 5 52883 14 41 23 1.827 286.9 2.1 0.9 0.5 5 53453 14 50 53 1.738 286.2 1.7 0.8 0.5 5 53940 14 59 00 1.670 285.1 1.4 1.2 0.3 5 54510 15 08 30 1.599 285.1 1.8 0.9 0.5 5 55079 15 17 59 1.537 284.7 1.1 1.1 0.4 5 55700 15 28 20 1.477 286.0 0.4 0.7 0.4 5 55971 15 32 51 1.452 284.5 1.0 1.1 0.2 5 57119 15 51 59 1.364 285.5 1.8 1.4 0.2 5 57604 16 00 04 1.332 286.2 2.9 1.5 0.7 5 58171 16 09 31 1.299 282.7 2.1 2.3 0.3 5 59120 16 25 20 1.251 284.6 1.2 1.9 0.4 5 59604 16 33 24 1.230 283.8 1.2 2.0 0.3 5 60088 16 41 28 1.211 285.9 1.5 1.6 0.3 5 60572 16 49 32 1.194 285.7 1.6 1.9 0.5 5 61520 17 05 20 1.167 286.1 2.6 1.7 0.8 5 62004 17 13 24 1.155 284.8 3.7 2.3 0.8 5 62487 17 21 27 1.145 286.8 1.0 1.7 0.5 5 62971 17 29 31 1.136 286.7 2.2 1.9 0.6 5 63920 17 45 20 1.123 288.9 1.7 1.4 0.4 5 64403 17 53 23 1.119 287.5 1.6 1.8 0.4 5 64887 18 01 27 1.116 286.1 1.7 1.6 0.6 5 65370 18 09 30 1.114 286.9 1.4 1.4 0.4 5 66553 18 29 13 1.115 285.8 1.4 2.0 0.4 5 67614 18 46 54 1.123 286.7 1.7 2.4 0.5 5 68097 18 54 57 1.129 285.5 2.8 2.8 0.5 5 69064 19 11 04 1.145 285.7 2.3 2.5 0.9 5 70987 19 43 07 1.195 286.2 2.0 2.5 0.7 5 71471 19 51 11 1.212 286.2 0.4 2.4 0.3 5 72906 20 15 06 1.275 281.1 2.4 3.3 0.9 5 73393 20 23 13 1.300 285.7 1.9 1.7 0.2 5 74200 20 36 40 1.349 287.3 0.8 1.7 0.2 5 74724 20 45 24 1.386 287.9 1.0 1.8 0.2 5 76365 21 12 45 1.527 288.0 2.4 1.9 0.6 5 78726 21 52 06 1.839 286.0 2.6 1.6 0.7 5 80822 22 27 02 2.308 286.7 4.3 1.6 1.6 5 81789 22 43 09 2.637 287.6 3.4 0.3 1.1 5 82462 22 54 22 2.933 286.3 2.2 0.1 0.8 5