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 Fairbanks ( 64.84, 147.56) POLARIS 1 1 1997 08 24 1997 08 24 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. Fairbanks 19 007 64.84 147.56 0.0 287.6 2.3 3.5 1.7 63639 17 40 39 2.708 285.2 1.2 0.9 0.2 5 65015 18 03 35 2.473 283.2 2.2 1.6 0.3 5 65529 18 12 09 2.398 284.6 1.9 1.1 0.4 5 66042 18 20 42 2.329 288.4 4.9 0.0 1.5 5 71989 19 59 49 1.840 293.1 4.2 0.6 0.9 5 75089 20 51 29 1.732 283.3 3.9 4.5 1.3 5 77669 21 34 29 1.693 286.5 1.4 3.4 0.7 5 78357 21 45 57 1.690 288.0 1.9 3.3 0.4 5 78876 21 54 36 1.690 287.3 3.5 3.6 0.9 5 79855 22 10 55 1.694 289.2 2.2 3.6 0.7 5 80368 22 19 28 1.698 287.9 1.2 4.5 0.1 5 81050 22 30 50 1.707 286.8 1.0 5.0 0.6 5 82025 22 47 05 1.724 287.8 1.6 5.2 0.5 5 82540 22 55 40 1.736 289.5 2.3 4.5 0.5 5 83228 23 07 08 1.755 287.4 2.1 5.2 0.5 5 84207 23 23 27 1.787 288.9 4.1 5.5 0.8 5 85420 23 43 40 1.839 288.8 3.4 5.0 0.7 5 86412 24 00 12 1.890 288.4 2.2 5.0 0.6 5 86940 00 09 00 1.921 289.6 3.1 4.8 0.5 5