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 07 31 1996 07 31 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 16 009 21.31 158.07 0.0 276.3 2.6 -1.5 1.0 83951 23 19 11 1.015 277.6 1.8 -2.5 0.5 5 84757 23 32 37 1.026 275.2 2.8 -1.9 0.6 5 86800 24 06 40 1.070 279.7 0.9 -2.9 0.4 5 87968 00 26 08 1.107 277.3 3.2 -2.0 0.9 5 88174 00 29 34 1.114 277.8 2.4 -2.2 0.5 5 89212 00 46 52 1.157 277.6 2.4 -2.0 0.7 5 89719 00 55 19 1.180 279.6 2.0 -2.4 0.4 5 90889 01 14 49 1.247 276.6 1.3 -1.7 0.4 5 91095 01 18 15 1.260 274.7 2.6 -1.0 0.7 5 92570 01 42 50 1.371 275.8 2.0 -1.2 0.4 5 94009 02 06 49 1.515 275.2 2.2 -0.6 0.6 5 95071 02 24 31 1.652 274.0 1.7 -0.5 0.5 5 96002 02 40 02 1.803 273.5 1.0 -0.5 0.3 5 96511 02 48 31 1.900 271.4 1.2 0.0 0.4 5 100193 03 49 53 3.234 266.5 1.1 -0.5 0.5 5 101265 04 07 45 4.089 262.6 0.7 -2.3 0.3 5