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 04 1997 05 04 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 25 007 64.84 147.56 0.0 390.7 4.4 1.5 1.3 60719 16 51 59 2.676 394.2 0.5 -2.0 0.3 5 61930 17 12 10 2.457 390.2 0.8 -0.1 0.2 5 62467 17 21 07 2.373 391.5 0.9 0.2 0.3 5 62998 17 29 58 2.297 393.2 1.2 0.5 0.4 5 64217 17 50 17 2.143 391.3 0.7 1.1 0.2 5 64749 17 59 09 2.084 390.1 1.7 2.0 0.4 5 65281 18 08 01 2.030 390.4 1.3 1.9 0.3 5 67588 18 46 28 1.837 390.2 1.0 1.2 0.4 5 68326 18 58 46 1.788 387.8 1.7 2.7 0.5 5 68863 19 07 43 1.755 388.9 1.3 2.7 0.4 5 69601 19 20 01 1.715 387.0 2.0 3.1 0.4 5 70341 19 32 21 1.679 387.0 1.5 3.4 0.4 5 70877 19 41 17 1.655 386.4 1.7 3.5 0.4 5 74369 20 39 29 1.548 393.5 4.8 1.1 1.1 5 78558 21 49 18 1.507 384.0 3.5 0.3 1.1 5 79598 22 06 38 1.510 383.1 1.2 1.1 0.3 5 80133 22 15 33 1.514 384.3 1.9 1.0 0.5 5 80871 22 27 51 1.521 386.7 2.7 1.0 0.9 5 81912 22 45 12 1.537 386.8 2.8 0.0 0.7 5 85096 23 38 16 1.620 387.8 2.6 1.6 0.7 5 87433 00 17 13 1.723 395.1 1.2 1.3 0.3 5 88473 00 34 33 1.783 395.9 0.5 2.1 0.2 5 89010 00 43 30 1.817 399.2 1.9 1.4 0.5 5 90792 01 13 12 1.954 397.9 1.9 1.2 0.7 5 97802 03 10 02 3.047 392.7 2.9 -3.3 1.0 5