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 08 21 1997 08 21 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 27 007 64.84 147.56 0.0 304.6 4.2 4.5 2.0 65519 18 11 59 2.324 307.7 3.3 0.8 1.9 5 66645 18 30 45 2.189 308.6 3.7 1.7 0.6 5 67159 18 39 19 2.135 310.2 1.4 1.4 0.4 5 67672 18 47 52 2.085 309.3 2.9 2.0 0.9 5 68804 19 06 44 1.989 306.1 2.5 3.0 0.7 5 71095 19 44 55 1.839 307.8 1.0 2.8 0.4 5 71783 19 56 23 1.805 306.9 1.6 3.3 0.5 5 72302 20 05 02 1.781 305.5 1.5 3.6 0.5 5 72989 20 16 29 1.754 303.7 1.8 3.9 0.4 5 73676 20 27 56 1.730 303.5 1.8 4.4 0.3 5 74195 20 36 35 1.714 303.7 1.5 4.6 0.5 5 74877 20 47 57 1.696 305.6 2.2 4.8 0.7 5 75570 20 59 30 1.681 290.3 3.8 7.9 0.9 5 76776 21 19 36 1.662 301.8 3.4 5.4 0.8 5 77462 21 31 02 1.655 304.0 2.8 5.5 0.5 5 77981 21 39 41 1.652 304.0 1.9 5.6 0.5 5 78925 21 55 25 1.651 302.9 1.7 6.0 0.4 5 79903 22 11 43 1.654 303.9 0.8 6.2 0.3 5 80423 22 20 23 1.658 301.3 1.2 6.5 0.4 5 81110 22 31 50 1.667 301.3 1.4 6.5 0.5 5 82089 22 48 09 1.683 302.6 0.8 6.5 0.1 5 82608 22 56 48 1.695 302.8 2.3 6.5 0.8 5 83295 23 08 15 1.713 305.1 3.4 6.0 1.2 5 84274 23 24 34 1.744 304.5 2.0 5.9 0.7 5 84793 23 33 13 1.763 304.2 3.0 5.7 1.2 5 86462 24 01 02 1.840 302.2 1.8 6.1 0.3 5 95818 02 36 58 3.026 315.6 3.5 -0.3 1.1 5