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 04 1996 08 04 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 20 009 21.31 158.07 0.0 285.9 3.8 -1.4 0.8 64798 17 59 58 2.359 279.4 0.8 -0.4 0.2 5 65309 18 08 29 2.202 280.7 0.7 -0.7 0.2 5 65823 18 17 03 2.066 279.2 2.7 0.1 1.0 5 67030 18 37 10 1.810 282.2 0.4 -1.0 0.2 5 67685 18 48 05 1.700 268.9 4.3 3.7 3.2 5 68689 19 04 49 1.560 285.3 0.9 -1.0 0.3 5 69477 19 17 57 1.469 282.3 4.4 -0.7 1.1 5 70417 19 33 37 1.378 285.3 1.0 -1.3 0.1 5 86247 23 57 27 1.058 286.9 1.8 -2.0 0.6 5 87660 00 21 00 1.099 289.4 2.0 -2.5 0.3 5 88824 00 40 24 1.143 291.9 2.1 -2.6 0.5 5 89030 00 43 50 1.152 291.6 1.6 -2.5 0.4 5 90064 01 01 04 1.203 287.2 2.7 -1.6 0.7 5 90569 01 09 29 1.232 288.5 2.4 -1.8 0.8 5 91734 01 28 54 1.310 288.6 0.9 -1.6 0.2 5 92381 01 39 41 1.362 286.2 2.1 -0.9 0.6 5 93662 02 01 02 1.485 284.0 1.6 -0.6 0.3 5 94300 02 11 40 1.560 280.9 3.7 0.1 0.8 5 94947 02 22 27 1.647 283.3 1.6 -0.4 0.4 5 100089 03 48 09 3.233 275.7 0.5 -0.7 0.1 5