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 18 1997 05 18 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 0.0 388.0 10.8 2.4 1.5 60644 16 50 44 2.370 400.7 1.8 -0.1 0.6 5 61177 16 59 37 2.291 401.1 1.3 0.1 0.4 5 62394 17 19 54 2.132 400.7 1.4 0.6 0.3 5 62926 17 28 46 2.071 401.1 2.7 0.4 0.6 5 63463 17 37 43 2.014 395.7 4.9 1.9 0.9 5 66724 18 32 04 1.744 399.5 2.4 1.5 0.8 5 67462 18 44 22 1.697 401.3 1.3 1.9 0.2 5 68737 19 05 37 1.628 402.7 1.2 2.1 0.7 5 69475 19 17 55 1.594 404.4 3.0 2.3 0.5 5 72618 20 10 18 1.485 402.4 2.1 1.8 1.1 5 73653 20 27 33 1.461 394.7 3.4 3.6 2.5 5 77244 21 27 24 1.415 388.6 3.7 2.9 2.0 5 79857 22 10 57 1.416 387.5 2.9 3.4 0.6 5 80394 22 19 54 1.420 385.3 1.3 3.2 0.4 5 82083 22 48 03 1.441 383.5 1.9 3.7 0.5 5 82615 22 56 55 1.450 380.9 2.6 4.2 0.8 5 83348 23 09 08 1.464 382.9 1.0 3.8 0.5 5 84381 23 26 21 1.489 380.7 1.7 4.2 0.3 5 84912 23 35 12 1.504 378.4 2.5 4.6 0.7 5 85647 23 47 27 1.528 379.0 0.2 4.7 0.2 5 87958 00 25 58 1.621 381.9 3.8 2.2 0.8 5 88997 00 43 17 1.676 378.5 1.8 3.2 0.4 5 89535 00 52 15 1.707 379.6 0.8 2.7 0.3 5 90274 01 04 34 1.754 378.6 1.1 2.8 0.3 5 91315 01 21 55 1.830 377.0 2.0 2.7 0.4 5 91853 01 30 53 1.873 375.9 0.8 3.0 0.4 5 92592 01 43 12 1.937 375.7 1.1 2.6 0.3 5 99573 03 39 33 3.048 366.8 1.3 -1.8 0.8 5