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 21 1997 06 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 20 007 64.84 147.56 0.0 334.7 3.1 1.1 2.6 82199 22 49 59 1.351 338.5 2.2 -0.8 0.8 5 83778 23 16 18 1.376 336.6 2.8 -0.2 0.7 5 84515 23 28 35 1.392 336.8 1.5 -0.3 0.5 5 85555 23 45 55 1.417 337.3 0.6 -0.1 0.2 5 86091 23 54 51 1.432 337.2 1.4 0.2 0.4 5 86864 00 07 44 1.456 339.8 1.4 -0.6 0.4 5 87904 00 25 04 1.494 337.0 1.7 0.2 0.6 5 88442 00 34 02 1.515 338.3 2.5 0.1 0.6 5 89180 00 46 20 1.548 337.8 1.4 0.4 0.4 5 90644 01 10 44 1.623 334.5 1.2 4.6 0.5 5 91684 01 28 04 1.685 335.4 0.8 4.0 0.2 5 92221 01 37 01 1.721 333.1 1.4 4.8 0.5 5 92962 01 49 22 1.775 331.9 2.4 4.6 0.6 5 94009 02 06 49 1.860 331.2 0.9 4.4 0.3 5 94551 02 15 51 1.908 331.8 1.9 4.1 0.4 5 95297 02 28 17 1.981 331.5 0.7 3.8 0.3 5 101784 04 16 24 3.045 333.2 1.5 -0.4 0.8 5 102321 04 25 21 3.186 334.1 1.4 -1.3 0.5 5 103685 04 48 05 3.603 330.1 0.9 -2.9 0.9 5 104222 04 57 02 3.794 328.5 3.1 -3.5 1.2 5