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 06 23 1997 06 23 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 23 007 64.84 147.56 0.0 310.2 4.2 5.2 1.5 63770 17 42 50 1.835 308.0 1.5 3.4 0.4 5 64517 17 55 17 1.775 305.9 0.4 4.4 0.2 5 65059 18 04 19 1.736 304.9 1.5 5.0 0.2 5 65805 18 16 45 1.685 307.5 2.1 5.2 0.4 5 66547 18 29 07 1.640 306.6 1.1 5.4 0.3 5 67084 18 38 04 1.609 305.2 1.9 6.3 0.4 5 67830 18 50 30 1.571 304.1 1.9 7.1 0.6 5 69865 19 24 25 1.483 308.8 1.0 4.6 0.5 5 70912 19 41 52 1.447 308.3 1.2 5.7 0.1 5 71448 19 50 48 1.431 309.4 1.6 5.6 0.5 5 72194 20 03 14 1.411 307.4 2.6 6.4 0.6 5 73241 20 20 41 1.386 307.9 0.9 7.0 0.5 5 73778 20 29 38 1.375 309.0 2.4 6.8 0.5 5 74523 20 42 03 1.362 309.3 1.9 7.3 0.6 5 75569 20 59 29 1.348 311.1 1.9 7.1 0.6 5 76105 21 08 25 1.342 310.0 3.6 7.0 1.3 5 87245 00 14 05 1.469 314.9 1.3 4.7 0.5 5 87787 00 23 07 1.489 314.1 2.7 4.6 0.7 5 88537 00 35 37 1.519 316.1 2.1 4.1 0.3 5 90662 01 11 02 1.623 315.3 1.3 3.4 0.3 5 91716 01 28 36 1.687 315.9 1.6 3.4 0.5 5 92259 01 37 39 1.723 316.3 0.8 3.1 0.5 5 93012 01 50 12 1.778 318.9 3.5 2.3 0.8 5