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 20 1996 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. Moffet Field 47 009 37.42 122.58 0.0 304.8 5.6 -1.2 0.8 54667 15 11 07 2.529 292.6 1.5 -0.9 0.4 5 55320 15 22 00 2.332 293.4 0.4 -0.7 0.2 5 55831 15 30 31 2.199 295.2 0.8 -1.0 0.3 5 56342 15 39 02 2.082 295.8 0.7 -1.1 0.3 5 57719 16 01 59 1.827 295.5 1.2 -0.6 0.3 5 58369 16 12 49 1.730 296.1 1.5 -0.5 0.3 5 58879 16 21 19 1.662 297.4 1.1 -0.9 0.3 5 59529 16 32 09 1.585 298.1 1.4 -1.2 0.4 5 60601 16 50 01 1.477 298.2 1.6 -1.3 0.4 5 61540 17 05 40 1.398 299.3 0.8 -1.5 0.3 5 62049 17 14 09 1.360 299.5 1.0 -1.5 0.4 5 62699 17 24 59 1.316 299.4 1.6 -1.4 0.4 5 63771 17 42 51 1.255 304.2 1.9 -2.5 0.3 5 63978 17 46 18 1.244 302.1 1.7 -1.9 0.3 5 65115 18 05 15 1.192 301.5 0.8 -1.9 0.3 5 65623 18 13 43 1.171 302.3 0.9 -2.0 0.2 5 66809 18 33 29 1.132 303.7 1.7 -2.0 0.5 5 67016 18 36 56 1.126 304.6 0.8 -2.3 0.3 5 68062 18 54 22 1.099 304.9 1.3 -2.2 0.4 5 68573 19 02 53 1.088 305.9 1.9 -2.4 0.4 5 69761 19 22 41 1.067 305.5 0.9 -2.1 0.2 5 69968 19 26 08 1.064 306.1 2.2 -2.2 0.4 5 71016 19 43 36 1.053 308.2 2.3 -2.5 0.5 5 71522 19 52 02 1.049 307.8 1.1 -2.3 0.4 5 72712 20 11 52 1.045 305.7 0.5 -1.5 0.3 5 72920 20 15 20 1.045 304.6 1.7 -1.4 0.4 5 73550 20 25 50 1.045 306.2 1.6 -1.5 0.4 5 74987 20 49 47 1.053 308.5 1.6 -1.9 0.4 5 76167 21 09 27 1.066 308.7 2.6 -1.5 0.6 5 76374 21 12 54 1.069 310.0 1.8 -1.8 0.4 5 77419 21 30 19 1.088 309.8 1.9 -1.5 0.4 5 77926 21 38 46 1.099 311.0 1.8 -1.5 0.3 5 79114 21 58 34 1.129 310.3 1.5 -1.3 0.3 5 79321 22 02 01 1.136 310.6 0.8 -1.2 0.1 5 80366 22 19 26 1.171 310.3 1.0 -0.5 0.2 5 80876 22 27 56 1.191 310.3 0.8 -0.4 0.4 5 82064 22 47 44 1.246 311.2 2.3 -0.4 0.4 5 82271 22 51 11 1.257 310.5 1.5 -0.4 0.4 5 83888 23 18 08 1.356 310.4 1.7 -0.2 0.4 5 84828 23 33 48 1.427 310.1 1.5 0.0 0.3 5 85337 23 42 17 1.471 310.8 1.9 0.0 0.4 5 85986 23 53 06 1.534 310.2 1.7 0.1 0.5 5 86957 00 09 17 1.643 310.9 1.0 0.1 0.3 5 87898 00 24 58 1.769 309.7 2.2 0.4 0.6 5 88413 00 33 33 1.849 309.0 0.6 0.1 0.3 5 89068 00 44 28 1.965 309.0 0.7 0.2 0.3 5 92891 01 48 11 3.178 303.7 2.3 -0.6 1.0 5