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 10 1997 05 10 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 0.0 382.1 2.6 1.8 2.1 59835 16 37 15 2.682 385.4 0.6 -1.7 0.2 5 61069 16 57 49 2.456 385.8 1.1 -0.8 0.2 5 61601 17 06 41 2.372 384.1 1.1 -0.3 0.5 5 62132 17 15 32 2.294 383.4 0.9 0.0 0.4 5 63345 17 35 45 2.138 382.4 1.2 0.4 0.4 5 63876 17 44 36 2.078 380.6 1.0 0.9 0.3 5 66547 18 29 07 1.837 379.8 0.9 1.1 0.2 5 67284 18 41 24 1.784 378.9 1.9 1.5 0.5 5 67821 18 50 21 1.750 381.0 0.6 1.2 0.4 5 68560 19 02 40 1.706 382.3 3.2 1.5 0.7 5 69297 19 14 57 1.668 382.6 1.3 1.8 0.6 5 69834 19 23 54 1.642 380.9 3.5 2.1 1.3 5 70571 19 36 11 1.610 379.8 1.9 2.6 0.4 5 71308 19 48 28 1.582 381.4 2.8 2.3 0.5 5 71844 19 57 24 1.563 377.9 1.6 3.6 0.6 5 75087 20 51 27 1.486 386.8 2.1 2.5 0.5 5 76123 21 08 43 1.473 383.2 1.3 4.4 0.5 5 76618 21 16 58 1.468 383.5 3.0 4.7 0.7 5 77351 21 29 11 1.463 383.8 2.0 4.7 0.8 5 78385 21 46 25 1.461 380.1 1.5 4.7 0.3 5 78608 21 50 08 1.461 380.3 1.8 4.9 0.6 5 89889 00 58 09 1.808 389.3 4.0 -2.2 1.5 5