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 05 20 1997 05 20 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 31 007 64.84 147.56 0.0 351.3 2.2 2.9 1.2 58660 16 17 40 2.683 350.3 4.1 -0.4 2.1 5 62180 17 16 20 2.133 353.1 0.9 1.6 0.5 5 62716 17 25 16 2.070 355.2 1.4 1.7 0.5 5 63248 17 34 08 2.013 353.5 1.3 2.3 0.4 5 65209 18 06 49 1.836 354.9 1.2 1.5 0.4 5 65948 18 19 08 1.780 354.0 2.4 1.9 0.6 5 66485 18 28 05 1.743 352.1 1.6 2.4 0.6 5 67223 18 40 23 1.696 351.6 0.8 2.7 0.2 5 67961 18 52 41 1.654 350.1 0.7 3.6 0.3 5 68498 19 01 38 1.627 349.8 1.0 3.7 0.2 5 69230 19 13 50 1.592 350.4 2.0 4.4 0.3 5 69963 19 26 03 1.560 351.3 4.2 4.8 0.8 5 72203 20 03 23 1.485 355.2 1.0 2.7 0.2 5 73238 20 20 38 1.459 352.2 2.5 3.6 0.8 5 73770 20 29 30 1.447 351.7 3.1 4.2 1.0 5 74505 20 41 45 1.434 353.0 2.5 3.8 0.7 5 75539 20 58 59 1.419 352.9 2.1 4.3 0.6 5 80923 22 28 43 1.415 351.1 1.5 3.2 0.4 5 81959 22 45 59 1.428 351.5 1.7 3.1 0.4 5 82495 22 54 55 1.436 347.9 1.4 4.0 0.4 5 83226 23 07 06 1.451 349.7 0.8 4.0 0.1 5 84262 23 24 22 1.475 350.2 2.4 3.9 0.6 5 84792 23 33 12 1.489 348.7 1.2 4.0 0.4 5 85532 23 45 32 1.511 345.7 1.5 4.4 0.5 5 88257 00 30 57 1.621 346.9 1.7 2.8 0.4 5 89298 00 48 18 1.677 349.3 1.7 2.0 0.5 5 89835 00 57 15 1.709 349.7 3.9 2.0 1.1 5 90575 01 09 35 1.758 351.0 2.5 2.0 0.6 5 91617 01 26 57 1.834 353.0 2.3 1.7 0.6 5 92154 01 35 54 1.878 351.5 1.9 1.8 0.5 5 92896 01 48 16 1.944 351.4 1.5 1.5 0.4 5