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 04 30 1997 04 30 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 16 007 64.84 147.56 0.0 376.9 7.5 0.6 1.3 64852 18 00 52 2.149 367.0 1.5 -0.1 0.7 5 65383 18 09 43 2.091 365.9 1.6 0.6 0.4 5 65915 18 18 35 2.038 366.9 1.3 0.5 0.6 5 68400 19 00 00 1.837 368.1 4.1 0.7 1.7 5 69675 19 21 15 1.760 370.6 2.1 0.4 0.6 5 72428 20 07 08 1.640 370.9 1.2 0.8 0.4 5 75654 21 00 54 1.563 364.8 3.7 2.9 1.0 5 78573 21 49 33 1.543 377.4 2.3 0.8 0.5 5 79615 22 06 55 1.546 378.3 2.9 0.4 0.7 5 83844 23 17 24 1.619 387.7 2.4 -0.9 1.3 5 87200 00 13 20 1.757 382.1 2.0 1.4 0.7 5 87737 00 22 17 1.788 382.2 1.6 1.7 0.5 5 88476 00 34 36 1.834 382.6 1.2 1.6 0.4 5 89517 00 51 57 1.908 381.7 1.0 2.0 0.3 5 90055 01 00 55 1.951 381.9 1.1 1.9 0.5 5 97233 03 00 33 3.048 382.7 1.4 -2.9 0.4 5