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 ( 37.42, 122.58) STRAT 1 1 1996 07 17 1996 07 17 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. Moffet Field 43 009 37.42 122.58 0.0 311.2 3.6 -2.0 1.9 56699 15 44 59 1.989 296.8 4.4 2.3 0.9 5 58725 16 18 45 1.669 306.4 0.9 2.1 0.1 5 59232 16 27 12 1.607 309.7 1.9 1.3 0.4 5 59874 16 37 54 1.537 308.2 1.7 1.9 0.5 5 60523 16 48 43 1.474 311.3 1.9 1.7 0.5 5 61452 17 04 12 1.396 314.3 0.9 1.2 0.2 5 61959 17 12 39 1.359 316.0 1.6 1.0 0.5 5 62447 17 20 47 1.326 315.3 2.6 1.4 0.6 5 63961 17 46 01 1.239 308.8 1.5 -3.0 0.4 5 64168 17 49 28 1.229 310.0 2.1 -3.2 0.5 5 65390 18 09 50 1.176 310.7 0.9 -3.3 0.3 5 65898 18 18 18 1.157 309.4 1.6 -3.1 0.5 5 67078 18 37 58 1.120 311.5 2.0 -3.5 0.5 5 67285 18 41 25 1.114 311.7 1.4 -3.3 0.3 5 68326 18 58 46 1.089 309.0 1.6 -2.7 0.5 5 68835 19 07 15 1.079 310.0 1.6 -2.8 0.5 5 70020 19 27 00 1.060 317.1 1.8 -4.1 0.6 5 70227 19 30 27 1.058 314.3 1.0 -3.3 0.3 5 71270 19 47 50 1.048 315.4 1.4 -3.6 0.3 5 71777 19 56 17 1.045 315.7 1.4 -3.7 0.5 5 72962 20 16 02 1.042 315.8 1.6 -3.9 0.4 5 73610 20 26 50 1.043 316.9 2.6 -4.1 0.6 5 74788 20 46 28 1.048 315.4 0.3 -3.9 0.3 5 74996 20 49 56 1.050 315.0 1.9 -3.8 0.5 5 76039 21 07 19 1.061 312.8 2.2 -3.4 0.6 5 76545 21 15 45 1.069 313.1 1.2 -3.4 0.3 5 77728 21 35 28 1.091 313.3 2.8 -3.0 0.6 5 77934 21 38 54 1.096 312.2 1.4 -2.6 0.7 5 79159 21 59 19 1.127 314.6 1.6 -3.0 0.5 5 79666 22 07 46 1.143 314.9 1.9 -3.2 0.5 5 80848 22 27 28 1.186 311.4 2.4 -2.3 0.7 5 81054 22 30 54 1.195 311.2 1.4 -2.6 0.4 5 82097 22 48 17 1.244 311.9 0.7 -2.2 0.3 5 82609 22 56 49 1.270 310.0 3.9 -1.8 0.9 5 84082 23 21 22 1.363 309.9 1.2 -1.3 0.3 5 85018 23 36 58 1.436 312.7 3.5 -1.8 0.9 5 85528 23 45 28 1.482 310.6 1.3 -1.4 0.5 5 86179 23 56 19 1.545 308.4 2.0 -1.0 0.5 5 86950 00 09 10 1.632 307.9 1.4 -0.8 0.5 5 87886 00 24 46 1.756 307.2 0.7 -0.7 0.3 5 88395 00 33 15 1.834 304.6 1.9 -0.3 0.5 5 89042 00 44 02 1.945 304.9 1.9 -0.4 0.5 5 92969 01 49 29 3.174 301.6 1.2 -1.5 0.5 5