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 01 1996 08 01 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 27 009 21.31 158.07 0.0 274.6 2.7 -1.5 0.9 65196 18 06 36 2.223 271.0 0.7 -0.8 0.2 5 65710 18 15 10 2.084 272.3 0.9 -0.7 0.2 5 66917 18 35 17 1.824 271.2 1.8 -0.2 0.5 5 67569 18 46 09 1.713 271.9 2.7 -0.7 1.0 5 68079 18 54 39 1.636 273.2 2.4 -1.0 0.4 5 70331 19 32 11 1.383 275.9 1.5 -1.5 0.3 5 70840 19 40 40 1.340 276.3 1.0 -1.8 0.3 5 76330 21 12 10 1.067 277.3 2.6 -2.3 0.6 5 77523 21 32 03 1.040 278.0 1.6 -2.7 0.4 5 77730 21 35 30 1.036 276.6 1.5 -2.5 0.3 5 78779 21 52 59 1.019 275.4 4.3 -2.2 0.9 5 80822 22 27 02 1.003 277.5 3.0 -2.5 0.8 5 81031 22 30 31 1.002 278.4 2.0 -2.6 0.4 5 82114 22 48 34 1.003 277.8 1.8 -2.7 0.3 5 84803 23 33 23 1.027 277.4 1.7 -2.6 0.4 5 85996 23 53 16 1.051 276.4 0.7 -2.3 0.4 5 87639 00 20 39 1.096 275.9 2.7 -2.1 0.7 5 88832 00 40 32 1.141 275.2 1.2 -1.5 0.3 5 89041 00 44 01 1.150 272.8 4.1 -0.8 0.9 5 90094 01 01 34 1.201 274.7 1.7 -1.4 0.4 5 90607 01 10 07 1.230 274.5 2.5 -1.4 0.7 5 91800 01 30 00 1.311 275.9 3.0 -1.5 0.7 5 92460 01 41 00 1.363 273.7 1.5 -1.1 0.5 5 93402 01 56 42 1.450 271.3 1.2 -0.4 0.2 5 93913 02 05 13 1.506 274.2 1.4 -1.0 0.3 5 95937 02 38 57 1.795 269.1 1.9 0.3 0.7 5 100176 03 49 36 3.238 262.7 1.9 0.0 0.7 5