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 ( 21.31, 158.07) STRAT 1 1 1996 02 12 1996 02 12 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 21.31 158.07 0.0 268.4 4.5 -0.8 0.9 68355 18 59 15 2.329 267.7 1.0 -0.5 0.3 5 68866 19 07 46 2.189 269.1 0.8 -1.0 0.3 5 69380 19 16 20 2.066 268.9 1.8 -0.5 0.4 5 70737 19 38 57 1.812 268.3 1.6 -0.5 0.2 5 71462 19 51 02 1.708 269.7 2.0 -1.2 0.7 5 71945 19 59 05 1.647 267.6 2.1 -0.7 0.5 5 72670 20 11 10 1.567 267.9 4.5 -0.7 0.4 5 73693 20 28 13 1.474 267.1 3.2 -0.8 0.6 5 74708 20 45 08 1.400 271.1 0.7 -1.7 0.1 5 75217 20 53 37 1.369 271.4 1.9 -1.7 0.5 5 75942 21 05 42 1.329 272.8 1.0 -2.0 0.3 5 77590 21 33 10 1.262 271.3 2.2 -1.7 0.5 5 78102 21 41 42 1.246 270.3 2.7 -1.4 0.9 5 78614 21 50 14 1.233 272.6 1.0 -2.0 0.4 5 79125 21 58 45 1.221 269.1 3.4 -1.3 0.9 5 80035 22 13 55 1.206 269.6 1.6 -1.1 0.3 5 80546 22 22 26 1.200 262.7 4.0 -0.3 0.7 5 81055 22 30 55 1.196 270.2 0.8 -1.1 0.3 5 81563 22 39 23 1.193 271.8 2.1 -1.6 0.4 5 82988 23 03 08 1.196 266.1 1.5 -0.2 0.5 5 84256 23 24 16 1.211 269.2 0.8 -1.0 0.5 5 84767 23 32 47 1.220 268.6 1.2 -0.8 0.2 5 85276 23 41 16 1.230 267.8 1.0 -0.8 0.2 5 85785 23 49 45 1.244 267.5 1.1 -0.9 0.4 5 86935 00 08 55 1.282 257.8 1.0 0.7 0.3 5 87444 00 17 24 1.302 253.0 1.7 2.0 0.7 5 88407 00 33 27 1.349 247.3 2.6 3.7 0.4 5 89425 00 50 25 1.411 240.3 3.7 5.2 0.9 5 89934 00 58 54 1.448 236.3 2.8 6.2 0.6 5 90658 01 10 58 1.506 234.9 2.7 6.9 0.7 5 93492 01 58 12 1.855 270.3 1.2 -0.5 0.4 5 94004 02 06 44 1.946 270.8 0.9 -0.4 0.2 5 97631 03 07 11 3.276 257.1 0.5 -0.4 0.2 5