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 23 1997 07 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 30 007 64.84 147.56 0.0 303.4 2.4 4.8 1.4 63180 17 33 00 2.093 305.5 3.0 1.8 0.3 5 66571 18 29 31 1.785 305.2 2.0 3.5 0.5 5 67090 18 38 10 1.749 305.2 0.8 3.5 0.4 5 67779 18 49 39 1.705 298.5 2.8 4.8 0.8 5 68984 19 09 44 1.638 301.8 0.8 4.9 0.3 5 69669 19 21 09 1.604 300.8 1.5 5.6 0.3 5 70356 19 32 36 1.574 302.7 1.4 5.5 0.7 5 70875 19 41 15 1.553 302.9 2.2 5.5 0.5 5 72978 20 16 18 1.485 304.7 1.9 4.0 0.6 5 73958 20 32 38 1.461 302.7 3.3 4.4 0.7 5 74475 20 41 15 1.450 304.3 1.2 4.3 0.4 5 75161 20 52 41 1.438 303.5 1.9 4.7 0.6 5 76139 21 08 59 1.424 305.4 3.0 4.8 0.4 5 76656 21 17 36 1.418 305.4 1.2 4.7 0.2 5 77342 21 29 02 1.413 302.8 2.1 5.5 0.5 5 78320 21 45 20 1.408 302.8 0.9 5.7 0.3 5 78838 21 53 58 1.407 301.1 0.5 6.0 0.2 5 79524 22 05 24 1.408 303.1 4.0 5.5 0.8 5 81705 22 41 45 1.422 302.0 2.4 6.5 0.5 5 83201 23 06 41 1.444 302.0 2.3 6.8 0.5 5 83882 23 18 02 1.458 307.0 2.1 6.0 1.0 5 84861 23 34 21 1.481 303.7 1.1 6.3 0.2 5 85379 23 42 59 1.495 303.7 1.7 6.4 0.6 5 86065 23 54 25 1.516 305.1 0.9 6.1 0.3 5 90168 01 02 48 1.703 306.5 0.7 3.9 0.3 5 90856 01 14 16 1.747 305.4 0.9 3.9 0.4 5 91815 01 30 15 1.815 294.5 1.5 6.1 0.2 5 92319 01 38 39 1.855 303.5 1.9 4.1 0.3 5 93004 01 50 04 1.913 304.9 0.7 3.6 0.3 5 100165 03 49 25 3.031 304.8 0.7 0.5 0.3 5