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 11 1996 02 11 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 22 009 19.50 158.00 0.0 296.5 18.9 -2.9 3.7 68386 18 59 46 2.334 305.5 1.4 -4.3 0.4 5 69847 19 24 07 1.979 299.5 1.2 -2.5 0.3 5 70729 19 38 49 1.823 295.6 4.4 -2.4 1.1 5 71457 19 50 57 1.716 295.0 1.7 -1.4 1.0 5 74936 20 48 56 1.391 301.8 1.8 -3.7 0.6 5 75447 20 57 27 1.361 302.8 0.5 -3.8 0.3 5 76170 21 09 30 1.324 304.4 1.9 -4.2 0.4 5 79859 22 10 59 1.213 306.1 2.1 -4.8 0.5 5 80369 22 19 29 1.206 305.1 0.4 -4.5 0.1 5 80878 22 27 58 1.201 304.9 1.2 -4.7 0.4 5 81387 22 36 27 1.199 304.0 2.1 -4.5 0.5 5 82813 23 00 13 1.200 302.3 1.2 -4.4 0.3 5 84076 23 21 16 1.212 300.1 1.9 -4.0 0.4 5 84585 23 29 45 1.221 299.9 1.4 -4.0 0.4 5 85095 23 38 15 1.231 298.9 0.9 -3.7 0.4 5 85604 23 46 44 1.244 297.3 0.9 -3.3 0.2 5 86548 00 02 28 1.278 293.2 3.1 -2.8 0.6 5 87059 00 10 59 1.292 286.7 1.6 -1.9 0.5 5 88303 00 31 43 1.349 283.0 2.7 -1.5 0.7 5 89319 00 48 39 1.410 266.4 3.9 2.6 1.1 5 90552 01 09 12 1.504 232.8 3.3 10.5 1.0 5 92072 01 34 32 1.660 225.6 2.0 11.2 0.3 5