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 07 07 1997 07 07 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 0.0 340.6 5.3 4.3 1.9 57981 16 06 21 2.674 333.5 2.5 0.4 1.0 5 59129 16 25 29 2.464 333.5 1.1 1.5 0.5 5 59643 16 34 03 2.381 334.2 0.9 1.6 0.4 5 60157 16 42 37 2.303 333.3 1.9 2.2 0.5 5 61282 17 01 22 2.152 331.3 0.9 2.6 0.2 5 61796 17 09 56 2.091 329.9 1.3 3.1 0.3 5 62309 17 18 29 2.033 331.1 4.7 2.7 0.7 5 66286 18 24 46 1.697 333.0 2.4 3.5 0.9 5 75038 20 50 38 1.377 343.6 1.9 3.2 0.8 5 76012 21 06 52 1.364 344.0 2.8 3.3 0.6 5 76526 21 15 26 1.359 345.5 2.0 3.4 0.6 5 77208 21 26 48 1.354 344.3 0.8 3.6 0.3 5 78358 21 45 58 1.349 346.7 2.8 3.8 0.6 5 79332 22 02 12 1.349 346.7 0.6 4.6 0.2 5 80305 22 18 25 1.352 344.3 4.7 5.5 1.0 5 80818 22 26 58 1.355 346.0 1.8 5.3 0.3 5 81498 22 38 18 1.361 346.3 1.5 5.6 0.3 5 82470 22 54 30 1.373 346.2 2.4 5.8 0.2 5 82983 23 03 03 1.380 346.4 1.7 6.0 0.5 5 83665 23 14 25 1.392 344.7 1.8 6.2 0.7 5 84640 23 30 40 1.412 341.3 1.7 6.8 0.6 5 85153 23 39 13 1.425 341.8 0.9 7.0 0.4 5 85836 23 50 36 1.442 341.4 0.9 7.2 0.4 5 86842 24 07 22 1.474 339.5 1.8 7.4 0.5 5 87356 00 15 56 1.492 339.7 2.9 7.4 0.8 5 90254 01 04 14 1.622 341.8 0.8 4.9 0.2 5 91234 01 20 34 1.679 340.7 0.6 5.3 0.3 5 93421 01 57 01 1.837 344.0 3.0 4.4 0.6 5 93941 02 05 41 1.881 343.2 1.5 4.8 0.3 5 94634 02 17 14 1.945 339.5 0.7 5.1 0.3 5 101395 04 09 55 3.027 339.8 2.2 0.4 0.4 5