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 Moffet Field ( 37.25, 122.03) STRAT 1 1 1995 10 24 1995 10 24 0 12 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. Moffet Field 49 009 37.25 122.03 0.0 283.7 2.4 0.2 0.5 54826 15 13 46 5.907 252.2 2.7 -20.4 1.6 5 59378 16 29 38 2.641 278.7 0.6 0.0 0.1 5 59999 16 39 59 2.472 277.9 1.1 0.4 0.3 5 60206 16 43 26 2.421 278.6 0.7 0.2 0.3 5 60722 16 52 02 2.306 279.4 0.9 0.3 0.3 5 60940 16 55 40 2.262 280.4 0.6 0.2 0.2 5 61453 17 04 13 2.167 281.5 0.5 0.3 0.2 5 62180 17 16 20 2.050 283.6 0.7 -0.1 0.3 5 62693 17 24 53 1.979 284.4 1.1 -0.3 0.2 5 63322 17 35 22 1.902 284.9 1.0 0.1 0.4 5 63837 17 43 57 1.847 284.2 1.6 0.3 0.6 5 64564 17 56 04 1.779 286.3 0.9 -0.3 0.2 5 65079 18 04 39 1.738 285.4 1.8 -0.4 0.5 5 65703 18 15 03 1.693 284.8 1.2 -0.1 0.4 5 66219 18 23 39 1.661 285.8 1.7 -0.5 0.4 5 66946 18 35 46 1.623 285.5 1.3 -0.3 0.4 5 67459 18 44 19 1.600 284.2 0.7 -0.1 0.1 5 68085 18 54 45 1.576 281.5 1.9 0.1 0.3 5 68598 19 03 18 1.560 282.2 2.3 -0.1 0.5 5 69325 19 15 25 1.541 283.6 1.1 -0.3 0.4 5 69838 19 23 58 1.532 284.6 1.3 -0.4 0.4 5 70465 19 34 25 1.524 283.3 1.0 0.0 0.4 5 70978 19 42 58 1.520 284.6 1.4 -0.2 0.4 5 71705 19 55 05 1.519 284.4 1.3 -0.2 0.4 5 72218 20 03 38 1.521 286.2 0.7 -0.6 0.2 5 72935 20 15 35 1.528 280.7 1.6 1.0 0.4 5 73449 20 24 09 1.536 280.5 1.5 1.0 0.4 5 74177 20 36 17 1.552 281.3 1.3 1.0 0.4 5 74690 20 44 50 1.567 282.4 2.4 0.9 0.7 5 75591 20 59 51 1.600 287.7 1.5 -0.2 0.3 5 76104 21 08 24 1.623 286.6 1.9 0.1 0.5 5 76832 21 20 32 1.661 287.0 0.7 0.1 0.2 5 77346 21 29 06 1.693 286.5 1.1 0.2 0.4 5 78062 21 41 02 1.745 281.7 1.6 1.3 0.4 5 78577 21 49 37 1.787 282.7 1.8 1.4 0.5 5 79304 22 01 44 1.857 284.2 2.5 1.0 0.8 5 79822 22 10 22 1.913 284.9 1.8 0.6 0.5 5 80633 22 23 53 2.016 285.7 1.1 0.4 0.3 5 81148 22 32 28 2.092 285.9 0.3 0.4 0.1 5 81876 22 44 36 2.217 286.0 0.7 0.2 0.2 5 82391 22 53 11 2.319 285.8 1.4 0.5 0.4 5 83014 23 03 34 2.463 285.5 0.6 0.3 0.2 5 83529 23 12 09 2.600 285.4 0.9 0.4 0.3 5 84268 23 24 28 2.835 284.3 0.7 0.0 0.2 5 84786 23 33 06 3.033 283.2 1.2 -0.1 0.4 5 85306 23 41 46 3.267 281.4 0.4 -0.6 0.1 5 85824 23 50 24 3.544 280.2 1.6 -1.2 0.6 5 87075 00 11 15 4.480 276.9 0.8 -5.9 0.7 5 87593 00 19 53 5.034 272.9 2.5 -11.1 1.3 5