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 03 1997 08 03 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 28 007 64.84 147.56 0.0 257.0 4.5 3.8 1.1 60551 16 49 11 2.696 264.0 1.4 0.9 0.4 5 61811 17 10 11 2.465 261.8 0.6 1.8 0.1 5 62325 17 18 45 2.383 262.2 0.7 2.1 0.3 5 62838 17 27 18 2.307 262.6 0.9 2.4 0.2 5 63969 17 46 09 2.160 261.9 0.9 2.9 0.4 5 64483 17 54 43 2.101 263.6 1.4 2.5 0.5 5 64997 18 03 17 2.046 262.7 1.6 3.0 0.5 5 67390 18 43 10 1.837 261.5 1.5 2.6 0.4 5 68075 18 54 35 1.789 260.1 0.6 3.4 0.2 5 68595 19 03 15 1.756 257.7 0.8 3.8 0.2 5 69282 19 14 42 1.716 261.0 1.1 3.3 0.3 5 69969 19 26 09 1.680 256.3 1.7 4.3 0.4 5 70488 19 34 48 1.655 257.5 0.6 3.9 0.3 5 71174 19 46 14 1.625 255.7 1.3 4.5 0.3 5 71861 19 57 41 1.598 257.3 1.9 4.3 0.5 5 72379 20 06 19 1.580 257.4 1.7 4.5 0.5 5 73071 20 17 51 1.558 256.7 2.5 4.6 1.0 5 76680 21 18 00 1.487 255.9 0.3 3.6 0.2 5 77658 21 34 18 1.479 254.4 1.3 4.1 0.6 5 78176 21 42 56 1.476 255.4 3.5 4.0 0.9 5 78862 21 54 22 1.475 248.6 4.2 5.4 1.0 5 79380 22 03 00 1.475 253.3 0.8 4.4 0.4 5 80359 22 19 19 1.479 252.6 1.1 4.9 0.2 5 80877 22 27 57 1.483 251.7 1.0 5.0 0.4 5 81563 22 39 23 1.490 251.1 1.3 5.0 0.4 5 82541 22 55 41 1.505 251.1 0.4 4.8 0.3 5 83060 23 04 20 1.514 249.4 3.2 5.0 0.7 5 83746 23 15 46 1.528 252.6 1.0 4.6 0.3 5