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 19 1996 07 19 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 0.0 307.2 5.2 -1.8 1.0 55172 15 19 32 2.364 294.2 0.8 -1.0 0.2 5 56042 15 34 02 2.142 297.7 0.5 -1.4 0.1 5 56552 15 42 32 2.031 297.7 0.5 -1.4 0.1 5 57685 16 01 25 1.827 297.4 2.0 -1.1 0.5 5 58336 16 12 16 1.730 297.7 2.0 -1.3 0.6 5 58847 16 20 47 1.662 299.5 2.1 -1.5 0.5 5 59496 16 31 36 1.585 299.7 1.7 -1.5 0.6 5 60568 16 49 28 1.477 302.4 1.3 -2.3 0.3 5 61504 17 05 04 1.398 301.1 2.5 -2.0 0.5 5 62013 17 13 33 1.360 302.6 1.9 -2.2 0.4 5 62659 17 24 19 1.316 303.5 1.7 -2.7 0.5 5 63730 17 42 10 1.255 304.9 1.9 -2.7 0.5 5 63937 17 45 37 1.244 306.2 2.2 -3.1 0.6 5 64982 18 03 02 1.195 302.2 2.0 -2.2 0.5 5 65490 18 11 30 1.175 303.5 1.5 -2.3 0.3 5 66677 18 31 17 1.134 304.9 2.2 -2.5 0.5 5 66884 18 34 44 1.128 306.1 0.8 -2.7 0.2 5 67930 18 52 10 1.100 305.9 1.3 -2.5 0.4 5 68440 19 00 40 1.089 306.6 1.3 -2.5 0.4 5 69627 19 20 27 1.068 310.3 2.3 -3.2 0.5 5 69834 19 23 54 1.065 309.8 0.6 -3.2 0.3 5 70881 19 41 21 1.053 308.2 1.0 -2.9 0.1 5 71387 19 49 47 1.049 307.5 2.5 -2.6 0.7 5 72576 20 09 36 1.044 308.4 2.4 -2.8 0.4 5 72784 20 13 04 1.044 308.7 1.8 -2.7 0.4 5 73849 20 30 49 1.045 313.8 1.8 -3.4 0.3 5 75030 20 50 30 1.052 309.9 1.1 -2.4 0.3 5 75237 20 53 57 1.054 311.7 1.7 -2.9 0.4 5 76285 21 11 25 1.067 311.1 1.3 -2.5 0.3 5 76791 21 19 51 1.075 312.5 1.3 -2.4 0.1 5 77979 21 39 39 1.099 312.1 2.1 -2.3 0.7 5 78187 21 43 07 1.104 313.0 1.3 -2.5 0.5 5 79232 22 00 32 1.132 312.7 1.8 -1.9 0.4 5 79738 22 08 58 1.148 311.6 1.5 -1.6 0.6 5 80924 22 28 44 1.192 313.2 1.5 -1.6 0.3 5 81131 22 32 11 1.201 311.8 1.0 -1.2 0.3 5 82177 22 49 37 1.251 312.7 2.0 -1.3 0.4 5 82653 22 57 33 1.276 311.0 1.8 -0.6 0.5 5 83853 23 17 33 1.351 311.8 0.6 -0.4 0.4 5 84792 23 33 12 1.422 311.0 0.4 -0.4 0.4 5 85301 23 41 41 1.466 310.9 0.8 -0.2 0.4 5 85952 23 52 32 1.528 310.9 0.9 -0.2 0.4 5 86950 00 09 10 1.638 309.7 1.1 0.4 0.3 5 87890 00 24 50 1.764 310.6 1.6 0.3 0.6 5 88405 00 33 25 1.843 310.7 1.7 -0.1 0.4 5 89060 00 44 20 1.958 309.8 1.1 0.0 0.3 5 92921 01 48 41 3.177 302.8 4.1 -0.3 1.6 5