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 29 1997 04 29 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 24 007 64.84 147.56 0.0 365.1 35.8 6.4 12.9 61539 17 05 39 2.672 373.1 0.7 -1.4 0.4 5 62741 17 25 41 2.458 375.2 1.4 -0.9 0.3 5 63273 17 34 33 2.377 375.1 2.0 -0.4 0.5 5 63805 17 43 25 2.301 375.5 1.0 0.1 0.3 5 65019 18 03 39 2.151 375.6 1.8 0.7 0.6 5 65551 18 12 31 2.093 376.1 0.9 1.3 0.2 5 66082 18 21 22 2.040 377.0 1.3 1.6 0.2 5 68618 19 03 38 1.838 385.6 0.5 0.2 0.2 5 69356 19 15 56 1.792 386.0 4.9 0.7 0.9 5 69888 19 24 48 1.762 381.9 1.6 1.6 0.6 5 70620 19 37 00 1.725 382.0 2.3 1.5 0.6 5 71352 19 49 12 1.693 379.7 2.0 2.5 0.6 5 71884 19 58 04 1.671 380.5 2.1 2.0 0.7 5 72615 20 10 15 1.645 380.4 1.6 2.4 0.4 5 73347 20 22 27 1.623 379.2 2.0 2.7 0.6 5 73879 20 31 19 1.609 379.9 1.7 2.8 0.6 5 74611 20 43 31 1.592 378.6 1.9 3.3 0.5 5 75343 20 55 43 1.578 378.5 1.4 3.8 0.5 5 75875 21 04 35 1.570 379.8 1.7 3.0 0.6 5 83463 23 11 03 1.619 381.1 1.4 1.9 0.4 5 84434 23 27 14 1.648 378.1 0.6 3.0 0.1 5 86749 00 05 49 1.746 272.7 0.9 40.6 0.3 5 87781 00 23 01 1.803 274.5 0.9 38.6 0.3 5 88316 00 31 56 1.836 278.0 2.3 37.4 0.6 5