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 Barbers Point ( 21.31, 158.07) STRAT 1 1 1996 08 02 1996 08 02 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. Barbers Point 30 009 21.31 158.07 0.0 274.3 2.7 -1.3 0.8 64302 17 51 42 2.525 271.0 0.6 -0.5 0.3 5 64959 18 02 39 2.299 271.5 0.3 -0.5 0.2 5 65469 18 11 09 2.151 272.2 0.5 -0.7 0.2 5 65983 18 19 43 2.021 272.1 1.1 -0.4 0.4 5 67061 18 37 41 1.800 275.9 1.5 -1.3 0.3 5 67713 18 48 33 1.692 274.4 1.0 -0.8 0.4 5 68224 18 57 04 1.618 275.2 1.5 -1.0 0.4 5 68876 19 07 56 1.534 276.2 0.6 -1.2 0.2 5 69535 19 18 55 1.461 275.7 0.3 -1.3 0.1 5 70872 19 41 12 1.338 277.7 1.3 -1.9 0.3 5 72075 20 01 15 1.252 276.7 4.8 -2.2 0.8 5 72281 20 04 41 1.239 278.0 2.0 -2.5 0.3 5 73329 20 22 09 1.181 274.3 3.9 -1.6 1.0 5 76105 21 08 25 1.074 275.5 1.3 -1.7 0.2 5 76615 21 16 55 1.061 272.2 2.4 -1.2 0.6 5 77809 21 36 49 1.035 275.8 2.6 -2.1 0.8 5 78016 21 40 16 1.031 274.6 2.7 -1.9 0.8 5 79067 21 57 47 1.016 279.0 1.7 -2.9 0.6 5 79573 22 06 13 1.011 278.1 2.4 -2.8 0.6 5 83488 23 11 28 1.011 276.4 3.9 -2.2 1.2 5 86246 23 57 26 1.057 273.3 4.3 -1.4 1.1 5 87513 00 18 33 1.093 273.6 1.5 -1.5 0.4 5 88019 00 26 59 1.110 274.8 2.1 -1.8 0.5 5 89382 00 49 42 1.167 276.6 0.7 -1.9 0.2 5 90431 01 07 11 1.221 272.5 1.3 -1.1 0.4 5 90943 01 15 43 1.252 266.0 4.9 0.4 1.1 5 93828 02 03 48 1.499 272.3 1.1 -0.4 0.2 5 96139 02 42 19 1.835 271.4 1.0 -0.1 0.4 5 96654 02 50 54 1.938 269.3 1.8 -0.1 0.4 5 100155 03 49 15 3.240 266.2 0.7 -0.1 0.3 5