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 20 1997 07 20 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 26 007 64.84 147.56 0.0 319.7 5.1 3.7 1.7 65544 18 12 24 1.836 317.2 0.9 1.3 0.1 5 66231 18 23 51 1.784 314.7 3.9 1.8 0.5 5 66751 18 32 31 1.747 317.4 1.7 1.1 0.4 5 67437 18 43 57 1.703 313.1 2.2 2.7 1.3 5 68643 19 04 03 1.635 321.7 3.3 1.6 2.3 5 72392 20 06 32 1.485 316.4 4.1 3.7 1.4 5 73370 20 22 50 1.459 311.4 0.9 5.2 0.3 5 73888 20 31 28 1.447 315.2 1.6 4.4 0.5 5 74575 20 42 55 1.433 312.4 3.4 5.1 1.0 5 75548 20 59 08 1.417 314.8 1.1 5.7 0.4 5 76061 21 07 41 1.410 314.3 2.0 6.2 0.5 5 76747 21 19 07 1.403 313.7 2.0 6.4 0.3 5 80124 22 15 24 1.395 322.4 2.5 3.8 0.6 5 82822 23 00 22 1.423 318.2 2.4 5.5 0.5 5 83508 23 11 48 1.435 318.3 2.0 5.4 0.4 5 84487 23 28 07 1.455 320.4 3.4 4.9 0.9 5 85611 23 46 51 1.486 323.3 2.4 4.6 0.7 5 86621 24 03 41 1.518 320.3 2.7 5.5 0.4 5 87140 00 12 20 1.537 320.5 1.0 5.7 0.2 5 89074 00 44 34 1.621 327.1 2.0 2.4 0.6 5 90053 01 00 53 1.675 329.2 2.1 2.0 0.9 5 90572 01 09 32 1.706 327.7 2.8 2.1 0.6 5 91259 01 20 59 1.750 325.2 2.2 2.7 0.7 5 92244 01 37 24 1.823 325.1 1.9 2.3 0.6 5 92764 01 46 04 1.864 325.0 1.5 2.3 0.6 5 93451 01 57 31 1.925 326.0 3.3 2.6 0.8 5