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 NASA Ames ( 37.42, 122.58) STRAT 1 1 1996 07 24 1996 07 24 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. NASA Ames 43 009 37.42 122.58 0.0 294.3 4.3 -1.8 0.8 55831 15 30 31 2.234 281.9 1.6 -0.7 0.5 5 56340 15 39 00 2.114 281.4 2.1 -0.6 0.4 5 58034 16 07 14 1.799 287.4 0.6 -1.4 0.3 5 58686 16 18 06 1.705 289.1 1.9 -1.4 0.4 5 59197 16 26 37 1.640 289.0 1.0 -1.3 0.3 5 59848 16 37 28 1.565 288.5 2.9 -1.1 0.5 5 60919 16 55 19 1.461 289.8 1.0 -1.6 0.2 5 61857 17 10 57 1.385 291.6 1.1 -1.9 0.3 5 62367 17 19 27 1.348 293.1 2.2 -2.6 0.6 5 63015 17 30 15 1.306 293.2 1.3 -2.6 0.4 5 63798 17 43 18 1.261 294.2 1.3 -2.8 0.3 5 64005 17 46 45 1.251 291.4 0.9 -2.0 0.3 5 65050 18 04 10 1.201 291.5 1.8 -2.0 0.2 5 65558 18 12 38 1.181 291.6 1.9 -2.1 0.4 5 66746 18 32 26 1.140 291.9 2.0 -2.1 0.4 5 66953 18 35 53 1.133 292.7 1.6 -2.6 0.4 5 68553 19 02 33 1.094 298.0 1.2 -3.6 0.2 5 68760 19 06 00 1.089 297.5 2.3 -3.2 0.5 5 69808 19 23 28 1.072 293.5 0.5 -2.5 0.2 5 70318 19 31 58 1.065 294.1 1.7 -2.5 0.4 5 71506 19 51 46 1.054 293.9 2.1 -2.4 0.5 5 71713 19 55 13 1.053 294.5 1.0 -2.4 0.4 5 72760 20 12 40 1.050 295.1 1.5 -2.6 0.4 5 73701 20 28 21 1.050 297.5 2.2 -2.8 0.4 5 75552 20 59 12 1.063 298.1 2.5 -2.7 0.6 5 76731 21 18 51 1.080 296.8 1.3 -2.2 0.2 5 76938 21 22 18 1.083 299.7 3.0 -3.0 0.6 5 77985 21 39 45 1.105 296.5 1.1 -2.2 0.4 5 78492 21 48 12 1.118 295.1 1.0 -1.7 0.2 5 79681 22 08 01 1.153 298.0 1.7 -2.0 0.4 5 79888 22 11 28 1.160 298.1 1.3 -1.9 0.3 5 80934 22 28 54 1.200 297.1 1.0 -1.5 0.3 5 81445 22 37 25 1.223 297.6 1.8 -1.6 0.5 5 82631 22 57 11 1.284 296.7 1.2 -0.9 0.3 5 82838 23 00 38 1.296 297.7 2.8 -1.2 0.7 5 83671 23 14 31 1.350 297.5 1.9 -0.9 0.5 5 84611 23 30 11 1.420 298.4 0.4 -0.9 0.2 5 85121 23 38 41 1.463 298.8 1.4 -0.8 0.5 5 85770 23 49 30 1.525 299.2 2.2 -0.6 0.3 5 86948 00 09 08 1.657 298.3 1.1 -0.4 0.4 5 87888 00 24 48 1.786 297.9 0.9 -0.3 0.3 5 88403 00 33 23 1.869 297.9 0.3 -0.6 0.1 5 89056 00 44 16 1.987 298.0 0.3 -0.5 0.2 5