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 09 1996 02 09 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 28 009 19.50 158.00 0.0 273.7 6.4 -2.1 1.2 68441 19 00 41 2.344 275.8 2.2 -1.2 0.6 5 68953 19 09 13 2.203 275.9 1.4 -1.5 0.3 5 69463 19 17 43 2.081 276.0 1.3 -1.5 0.5 5 71559 19 52 39 1.719 279.0 3.5 -3.7 0.7 5 72073 20 01 13 1.654 284.0 2.3 -4.5 0.8 5 72761 20 12 41 1.579 272.3 2.8 -2.1 0.6 5 75005 20 50 05 1.398 274.7 2.0 -2.1 0.5 5 75515 20 58 35 1.368 276.6 0.8 -2.7 0.2 5 76239 21 10 39 1.331 277.7 1.6 -3.2 0.4 5 77886 21 38 06 1.267 279.2 1.1 -3.5 0.3 5 78396 21 46 36 1.253 277.6 3.3 -3.0 0.6 5 78905 21 55 05 1.240 279.3 0.6 -3.2 0.3 5 79416 22 03 36 1.230 276.8 1.9 -2.5 0.5 5 80327 22 18 47 1.216 277.9 1.2 -3.2 0.5 5 80835 22 27 15 1.211 274.6 3.8 -2.8 0.7 5 84130 23 22 10 1.222 273.5 1.2 -2.0 0.5 5 84638 23 30 38 1.231 272.9 1.8 -1.8 0.4 5 85146 23 39 06 1.242 270.9 1.6 -1.7 0.7 5 85654 23 47 34 1.255 269.9 1.3 -1.1 0.5 5 86599 00 03 19 1.284 267.1 1.3 -1.0 0.4 5 87110 00 11 50 1.304 261.7 3.6 -1.2 1.1 5 88090 00 28 10 1.349 254.0 2.0 1.1 0.4 5 89111 00 45 11 1.408 247.0 2.6 2.5 0.7 5 89621 00 53 41 1.443 241.0 2.9 4.3 0.7 5 90345 01 05 45 1.499 238.6 4.0 4.9 1.1 5 92998 01 49 58 1.803 269.9 2.1 -2.1 0.5 5 94017 02 06 57 1.980 267.6 0.9 -2.0 0.3 5 97691 03 08 11 3.280 260.6 0.4 -1.4 0.1 5