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 06 25 1997 06 25 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 22 007 64.84 147.56 0.0 283.3 1.9 5.9 1.3 64564 17 56 04 1.775 283.1 1.8 3.5 0.6 5 65103 18 05 03 1.736 282.7 2.3 3.8 0.4 5 65850 18 17 30 1.686 283.1 1.8 4.1 0.5 5 66594 18 29 54 1.640 281.1 1.3 5.1 0.4 5 67133 18 38 53 1.610 282.9 1.5 4.9 0.4 5 67879 18 51 19 1.571 280.7 1.5 5.8 0.4 5 69923 19 25 23 1.483 282.8 1.6 4.6 0.4 5 71647 19 54 07 1.427 281.2 1.1 6.0 0.2 5 72698 20 11 38 1.400 282.2 1.5 6.4 0.5 5 73235 20 20 35 1.388 283.8 1.6 6.4 0.5 5 73981 20 33 01 1.373 283.6 2.5 6.5 0.5 5 75030 20 50 30 1.356 282.2 1.5 7.3 0.5 5 75568 20 59 28 1.349 281.2 2.6 7.4 0.6 5 76314 21 11 54 1.342 282.9 1.5 7.3 0.2 5 77363 21 29 23 1.334 282.6 1.1 7.9 0.4 5 77900 21 38 20 1.332 281.6 1.9 8.1 0.7 5 78646 21 50 46 1.330 283.6 3.4 7.7 0.7 5 81380 22 36 20 1.343 287.2 2.0 4.9 0.7 5 82429 22 53 49 1.355 285.6 2.9 5.8 0.7 5 82967 23 02 47 1.363 287.7 1.2 5.2 0.4 5 83716 23 15 16 1.376 285.2 1.3 5.9 0.2 5 84764 23 32 44 1.398 286.6 1.6 5.5 0.4 5