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 12 09 1996 12 09 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 26 009 21.31 158.07 0.0 289.6 4.6 -2.0 0.7 68101 18 55 01 2.571 281.0 0.8 -1.2 0.2 5 68758 19 05 58 2.380 282.1 0.9 -1.2 0.2 5 69270 19 14 30 2.255 283.1 0.5 -1.4 0.2 5 69784 19 23 04 2.145 283.3 1.7 -0.9 0.5 5 71752 19 55 52 1.832 285.5 0.7 -1.4 0.1 5 73183 20 19 43 1.679 288.8 1.5 -2.0 0.3 5 73835 20 30 35 1.624 289.6 1.7 -2.0 0.4 5 74347 20 39 07 1.587 290.2 1.6 -2.2 0.3 5 74999 20 49 59 1.545 291.5 2.0 -2.4 0.4 5 76210 21 10 10 1.483 292.2 1.5 -2.5 0.5 5 77153 21 25 53 1.447 292.5 1.7 -2.6 0.4 5 77664 21 34 24 1.432 293.1 0.5 -2.8 0.2 5 78316 21 45 16 1.416 293.3 0.9 -2.6 0.2 5 79257 22 00 57 1.399 294.2 0.4 -2.5 0.2 5 79767 22 09 27 1.394 293.4 0.4 -2.7 0.2 5 80419 22 20 19 1.391 292.8 1.0 -2.7 0.3 5 80934 22 28 54 1.391 293.4 1.3 -2.7 0.3 5 81876 22 44 36 1.396 294.8 1.5 -2.8 0.6 5 85046 23 37 26 1.477 293.6 2.1 -2.3 0.5 5 85988 23 53 08 1.522 293.3 1.8 -2.1 0.3 5 86518 00 01 58 1.552 291.1 1.7 -1.9 0.4 5 87564 00 19 24 1.625 292.0 1.0 -1.8 0.3 5 88863 00 41 03 1.742 287.5 1.4 -1.0 0.3 5 89516 00 51 56 1.816 288.9 1.4 -1.2 0.4 5 90461 01 07 41 1.944 288.8 2.2 -1.1 0.4 5 94772 02 19 32 3.172 278.6 1.5 -0.8 0.4 5