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 Barber's Point ( 19.50, 158.00) STRAT 1 1 1996 02 10 1996 02 10 0 14 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. Barber's Point 21 009 19.50 158.00 0.0 295.3 5.5 -5.7 0.9 68566 19 02 46 2.295 287.2 1.5 -4.5 0.4 5 69593 19 19 53 2.042 284.6 1.4 -4.2 0.4 5 72058 20 00 58 1.649 290.8 3.0 -5.3 1.1 5 72785 20 13 05 1.570 291.2 3.6 -5.3 0.6 5 75030 20 50 30 1.391 296.3 3.4 -6.5 0.9 5 75544 20 59 04 1.361 298.2 3.9 -7.3 1.1 5 76270 21 11 10 1.325 295.6 2.7 -6.7 0.6 5 77915 21 38 35 1.261 301.2 1.4 -5.6 0.4 5 78422 21 47 02 1.247 299.4 2.3 -5.7 0.7 5 78932 21 55 32 1.235 296.3 4.6 -6.1 0.9 5 79441 22 04 01 1.224 299.4 1.2 -6.7 0.3 5 80353 22 19 13 1.211 297.5 2.0 -6.7 0.4 5 80862 22 27 42 1.206 296.1 3.1 -6.0 1.0 5 81371 22 36 11 1.203 296.2 1.4 -6.1 0.5 5 81881 22 44 41 1.202 298.5 1.4 -7.1 0.1 5 82900 23 01 40 1.205 292.4 3.6 -4.1 1.6 5 84165 23 22 45 1.218 293.2 2.0 -5.7 0.7 5 85185 23 39 45 1.238 295.8 1.7 -5.2 0.5 5 87148 00 12 28 1.300 287.6 3.4 -1.6 1.7 5 89726 00 55 26 1.444 283.4 4.7 -2.9 0.7 5 97735 03 08 55 3.282 273.3 3.1 -1.2 0.8 5