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 08 1996 02 08 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 33 009 19.50 158.00 0.0 273.7 3.8 -3.7 0.8 68466 19 01 06 2.350 265.5 0.8 -2.3 0.2 5 68977 19 09 37 2.208 266.5 0.9 -2.5 0.3 5 69488 19 18 08 2.086 267.3 0.8 -2.7 0.3 5 70889 19 41 29 1.824 268.4 0.6 -2.5 0.2 5 71614 19 53 34 1.719 272.4 1.9 -3.3 0.5 5 72125 20 02 05 1.655 272.3 0.9 -3.4 0.2 5 72854 20 14 14 1.577 273.7 1.2 -4.2 0.2 5 74079 20 34 39 1.469 275.5 1.5 -4.2 0.4 5 75094 20 51 34 1.398 277.8 0.8 -4.5 0.2 5 75605 21 00 05 1.369 277.4 1.9 -4.5 0.6 5 76329 21 12 09 1.332 279.2 1.3 -4.7 0.5 5 77977 21 39 37 1.269 277.2 1.2 -4.3 0.4 5 78487 21 48 07 1.255 276.7 2.4 -4.0 0.6 5 78996 21 56 36 1.243 275.7 1.4 -3.8 0.4 5 79505 22 05 05 1.233 277.5 1.6 -4.4 0.4 5 80416 22 20 16 1.219 275.5 1.1 -4.0 0.4 5 80927 22 28 47 1.215 276.4 0.9 -4.2 0.3 5 81435 22 37 15 1.212 275.5 1.5 -4.0 0.2 5 81943 22 45 43 1.211 273.4 0.5 -3.6 0.1 5 82671 22 57 51 1.212 275.7 1.5 -3.9 0.2 5 84717 23 31 57 1.237 278.4 1.7 -4.7 0.4 5 85981 23 53 01 1.269 277.0 1.6 -4.3 0.3 5 86522 00 02 02 1.292 277.5 1.3 -4.8 0.2 5 87036 00 10 36 1.306 275.2 1.1 -4.2 0.4 5 87976 00 26 16 1.349 272.9 0.8 -3.7 0.1 5 88991 00 43 11 1.406 274.8 1.5 -3.7 0.3 5 89501 00 51 41 1.440 274.0 1.8 -3.6 0.4 5 90227 01 03 47 1.496 273.2 0.5 -3.4 0.1 5 91742 01 29 02 1.644 271.0 1.0 -2.8 0.2 5 92758 01 45 58 1.776 269.9 1.1 -2.5 0.1 5 93269 01 54 29 1.855 268.3 0.9 -1.9 0.2 5 94000 02 06 40 1.987 267.9 0.4 -2.3 0.2 5 97650 03 07 30 3.280 260.5 1.1 -1.8 0.2 5