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 19 1997 05 19 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 21 007 64.84 147.56 0.0 350.7 4.5 2.9 2.4 58827 16 20 27 2.670 352.3 2.0 -1.3 0.5 5 66059 18 20 59 1.781 351.5 0.8 0.9 0.3 5 66595 18 29 55 1.744 352.9 2.7 -0.1 1.1 5 68071 18 54 31 1.656 353.0 4.1 1.6 1.6 5 68608 19 03 28 1.628 354.0 2.8 1.8 0.6 5 69347 19 15 47 1.593 351.1 2.5 2.2 0.6 5 70084 19 28 04 1.562 354.2 2.3 1.9 0.7 5 74724 20 45 24 1.436 346.0 3.4 3.0 1.6 5 77031 21 23 51 1.411 344.1 1.6 5.3 0.5 5 81957 22 45 57 1.433 343.9 2.7 6.9 0.6 5 82493 22 54 53 1.442 345.4 1.1 6.4 0.3 5 83232 23 07 12 1.456 339.6 4.0 7.6 1.1 5 84807 23 33 27 1.495 348.4 2.0 6.5 0.5 5 88109 00 28 29 1.621 350.9 1.7 3.2 0.6 5 89152 00 45 52 1.677 351.4 3.3 3.1 0.8 5 89689 00 54 49 1.708 351.5 0.9 2.9 0.3 5 90429 01 07 09 1.756 352.1 1.1 2.8 0.9 5 91470 01 24 30 1.832 353.4 2.0 2.6 0.7 5 92007 01 33 27 1.875 353.2 1.5 2.9 0.4 5 92746 01 45 46 1.941 356.5 1.7 2.4 1.1 5 99675 03 41 15 3.046 359.1 1.2 -1.4 0.6 5