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 28 1997 07 28 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 15 007 64.84 147.56 0.0 269.3 4.7 2.4 0.8 62097 17 14 57 2.305 265.8 1.9 0.7 0.8 5 63223 17 33 43 2.157 263.2 0.8 2.1 0.2 5 63742 17 42 22 2.096 264.3 0.8 2.4 0.3 5 64261 17 51 01 2.039 262.7 2.5 2.8 0.6 5 66516 18 28 36 1.837 265.3 1.1 2.9 0.3 5 67203 18 40 03 1.786 266.3 1.0 3.1 0.3 5 67722 18 48 42 1.752 265.9 1.7 3.1 0.6 5 80529 22 22 09 1.440 274.8 3.4 1.5 1.3 5 81734 22 42 14 1.451 272.3 3.2 2.4 0.7 5 84894 23 34 54 1.513 269.6 1.4 3.8 0.3 5 86099 23 54 59 1.551 274.9 4.3 3.1 0.3 5 90053 01 00 53 1.739 275.6 3.4 1.5 0.8 5 91032 01 17 12 1.806 275.1 4.8 1.6 1.6 5 92238 01 37 18 1.900 274.7 1.7 1.4 0.5 5 93218 01 53 38 1.991 268.4 2.5 3.0 0.7 5