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 1995 11 07 1995 11 07 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 23 009 21.31 158.07 0.0 312.8 6.7 -4.3 1.2 67081 18 38 01 2.357 300.6 0.8 -2.8 0.2 5 67592 18 46 32 2.220 302.3 0.7 -3.0 0.2 5 68107 18 55 07 2.101 303.8 1.5 -2.9 0.2 5 69703 19 21 43 1.817 307.5 1.6 -3.2 0.3 5 74041 20 34 01 1.413 313.3 1.3 -4.4 0.4 5 75978 21 06 18 1.328 313.3 4.2 -4.5 0.7 5 76488 21 14 48 1.312 317.4 0.9 -5.2 0.4 5 78619 21 50 19 1.269 316.7 0.9 -5.0 0.3 5 79128 21 58 48 1.264 317.3 1.4 -5.1 0.5 5 79640 22 07 20 1.261 316.0 1.4 -4.9 0.2 5 81249 22 34 09 1.265 322.7 1.1 -6.1 0.3 5 82514 22 55 14 1.281 321.5 1.2 -5.8 0.4 5 83026 23 03 46 1.292 320.5 1.5 -5.7 0.4 5 83536 23 12 16 1.304 320.4 1.4 -5.6 0.3 5 84849 23 34 09 1.347 317.7 1.9 -5.3 0.4 5 85865 23 51 05 1.393 315.2 0.9 -4.4 0.2 5 86751 00 05 51 1.417 316.1 1.9 -4.7 0.5 5 87129 00 12 09 1.467 315.1 4.7 -5.0 1.3 5 88144 00 29 04 1.543 311.2 0.9 -3.7 0.4 5 89072 00 44 32 1.629 308.9 1.4 -3.1 0.2 5 90088 01 01 28 1.747 307.6 1.5 -3.1 0.4 5 90599 01 09 59 1.817 305.8 1.8 -2.6 0.5 5 91325 01 22 05 1.933 306.6 1.2 -2.9 0.4 5