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 05 1996 08 05 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 39 009 21.31 158.07 0.0 286.9 2.9 -1.6 0.9 64358 17 52 38 2.520 282.1 0.6 -0.6 0.3 5 65010 18 03 30 2.295 283.3 1.3 -0.7 0.3 5 65520 18 12 00 2.147 283.8 0.8 -0.6 0.3 5 66034 18 20 34 2.018 283.9 1.9 -0.3 0.5 5 67103 18 38 23 1.799 283.9 1.6 -0.6 0.2 5 67752 18 49 12 1.691 281.1 4.9 0.2 1.3 5 68261 18 57 41 1.617 286.3 1.3 -1.2 0.4 5 69454 19 17 34 1.472 286.5 2.1 -1.3 0.4 5 70389 19 33 09 1.381 288.4 2.8 -1.6 0.6 5 70911 19 41 51 1.337 286.6 1.5 -1.4 0.5 5 72105 20 01 45 1.252 286.6 1.5 -1.6 0.3 5 72311 20 05 11 1.239 286.9 1.6 -1.6 0.4 5 73356 20 22 36 1.182 286.3 1.8 -1.6 0.5 5 73863 20 31 03 1.157 286.6 1.5 -1.8 0.3 5 75101 20 51 41 1.107 288.3 1.0 -2.2 0.2 5 76149 21 09 09 1.074 291.1 0.9 -2.7 0.3 5 77846 21 37 26 1.035 290.3 2.6 -2.6 0.8 5 78052 21 40 52 1.031 290.0 1.2 -2.8 0.5 5 79098 21 58 18 1.016 293.5 0.4 -3.4 0.2 5 79604 22 06 44 1.011 291.3 1.8 -2.9 0.4 5 81117 22 31 57 1.003 286.8 1.5 -2.1 0.6 5 81327 22 35 27 1.003 284.3 2.0 -1.9 0.5 5 82400 22 53 20 1.005 290.2 2.2 -3.0 0.6 5 85230 23 40 30 1.037 291.1 1.9 -3.1 0.5 5 86421 24 00 21 1.063 289.3 0.5 -2.5 0.2 5 86631 00 03 51 1.069 289.3 1.7 -2.3 0.5 5 87678 00 21 18 1.100 287.3 1.8 -1.8 0.4 5 88185 00 29 45 1.118 287.8 1.3 -1.8 0.4 5 89372 00 49 32 1.169 286.8 1.0 -1.5 0.3 5 89578 00 52 58 1.179 286.3 2.6 -1.4 0.9 5 90623 01 10 23 1.236 286.4 1.8 -1.3 0.3 5 91135 01 18 55 1.269 285.2 3.2 -1.0 0.8 5 92331 01 38 51 1.359 287.6 1.9 -1.1 0.4 5 93270 01 54 30 1.446 288.0 1.1 -1.3 0.5 5 93780 02 03 00 1.501 285.9 0.6 -0.9 0.2 5 94854 02 20 54 1.637 284.0 1.1 -0.5 0.4 5 95793 02 36 33 1.786 282.8 0.7 -0.1 0.2 5 96304 02 45 04 1.881 281.6 0.7 0.1 0.2 5 100072 03 47 52 3.240 275.9 0.4 -0.5 0.2 5