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 23 1996 07 23 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 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 41 009 37.42 122.58 0.0 302.9 2.6 -1.5 0.9 56267 15 37 47 2.122 270.2 4.8 4.7 2.3 5 60762 16 52 42 1.472 298.7 2.5 -1.4 0.5 5 61702 17 08 22 1.394 298.9 0.9 -1.4 0.5 5 62212 17 16 52 1.356 301.6 2.2 -1.9 0.5 5 62859 17 27 39 1.313 300.9 0.8 -1.8 0.1 5 63935 17 45 35 1.252 296.6 1.1 -1.6 0.2 5 64125 17 48 45 1.243 300.1 1.6 -1.7 0.3 5 65388 18 09 48 1.186 300.4 1.7 -1.8 0.3 5 65594 18 13 14 1.178 302.2 0.8 -2.2 0.2 5 66640 18 30 40 1.141 305.1 1.5 -2.7 0.4 5 67151 18 39 11 1.126 305.9 1.4 -2.8 0.2 5 68340 18 59 00 1.097 303.6 1.6 -2.2 0.5 5 68547 19 02 27 1.092 301.9 1.7 -1.9 0.5 5 69593 19 19 53 1.074 300.3 1.6 -1.6 0.4 5 70099 19 28 19 1.066 301.5 2.5 -2.0 0.6 5 71289 19 48 09 1.054 303.6 1.5 -2.2 0.4 5 71497 19 51 37 1.053 303.1 1.4 -2.1 0.2 5 72544 20 09 04 1.049 302.6 1.4 -2.0 0.3 5 73051 20 17 31 1.048 304.0 2.1 -2.5 0.5 5 73702 20 28 22 1.049 302.4 2.9 -1.9 0.8 5 74884 20 48 04 1.056 304.4 3.3 -2.2 0.8 5 75091 20 51 31 1.057 304.1 1.1 -2.0 0.2 5 76138 21 08 58 1.069 305.7 1.5 -2.2 0.5 5 76644 21 17 24 1.077 306.6 2.2 -2.5 0.6 5 77832 21 37 12 1.100 306.9 1.7 -1.9 0.4 5 78039 21 40 39 1.105 307.6 1.7 -2.2 0.3 5 79085 21 58 05 1.133 306.7 1.2 -1.8 0.4 5 79592 22 06 32 1.148 307.4 1.0 -1.8 0.3 5 80777 22 26 17 1.192 307.2 2.9 -1.7 0.7 5 80984 22 29 44 1.201 304.2 1.1 -1.1 0.2 5 82028 22 47 08 1.250 303.2 3.1 -0.8 0.6 5 82539 22 55 39 1.277 301.9 0.6 -0.3 0.1 5 83740 23 15 40 1.352 304.0 2.2 -0.6 0.5 5 84679 23 31 19 1.423 303.4 1.9 -0.2 0.4 5 85190 23 39 50 1.466 303.7 2.4 -0.3 0.8 5 85840 23 50 40 1.528 302.9 0.7 -0.1 0.2 5 86950 00 09 10 1.652 301.8 1.1 0.1 0.4 5 87894 00 24 54 1.782 301.7 1.6 -0.2 0.3 5 88408 00 33 28 1.864 300.6 1.1 -0.1 0.3 5 89058 00 44 18 1.980 300.5 0.7 0.0 0.2 5 92976 01 49 36 3.277 297.5 0.0 -1.2 0.1 5