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 15 1997 08 15 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 20 007 64.84 147.56 0.0 283.2 3.3 4.8 1.0 66696 18 31 36 2.068 280.4 2.0 3.4 0.5 5 69618 19 20 18 1.838 282.2 1.4 3.1 0.4 5 70301 19 31 41 1.798 284.4 1.7 3.5 0.4 5 70815 19 40 15 1.771 283.3 1.2 3.9 0.6 5 71504 19 51 44 1.737 278.9 1.3 4.8 0.4 5 72191 20 03 11 1.708 280.7 2.7 4.4 0.8 5 73397 20 23 17 1.664 281.1 3.9 4.7 1.0 5 75270 20 54 30 1.616 276.8 4.2 6.6 1.9 5 75976 21 06 16 1.604 281.7 2.1 6.1 0.6 5 76494 21 14 54 1.596 277.6 0.8 7.3 0.3 5 82518 22 55 18 1.618 288.1 2.0 4.3 0.4 5 83497 23 11 37 1.641 283.7 2.2 5.5 0.7 5 84016 23 20 16 1.655 286.3 2.3 4.8 0.7 5 84704 23 31 44 1.677 282.5 4.4 5.4 0.9 5 85683 23 48 03 1.715 286.5 1.0 4.6 0.2 5 86202 23 56 42 1.737 286.0 2.6 4.9 0.6 5 86921 00 08 41 1.772 287.9 4.2 4.4 0.9 5 87902 00 25 02 1.827 282.9 2.2 5.3 0.5 5 88421 00 33 41 1.860 287.8 3.8 4.1 1.0 5 89108 00 45 08 1.908 286.0 1.3 4.7 0.3 5