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 22 1996 07 22 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 0.0 308.2 2.9 -1.5 1.1 56247 15 37 27 2.119 291.6 3.4 0.6 0.7 5 57850 16 04 10 1.817 302.0 1.6 -1.1 0.4 5 58499 16 14 59 1.721 303.5 0.5 -1.4 0.3 5 59008 16 23 28 1.655 302.8 1.4 -1.2 0.3 5 59661 16 34 21 1.578 305.4 1.2 -1.0 0.3 5 60735 16 52 15 1.471 306.8 1.0 -1.4 0.4 5 61675 17 07 55 1.393 308.7 1.6 -1.5 0.4 5 62184 17 16 24 1.355 308.8 1.2 -1.5 0.2 5 62833 17 27 13 1.312 309.6 1.9 -1.6 0.5 5 63909 17 45 09 1.252 311.1 1.2 -2.9 0.3 5 64117 17 48 37 1.241 310.4 0.5 -2.1 0.2 5 65166 18 06 06 1.193 310.3 1.5 -2.7 0.4 5 65676 18 14 36 1.173 308.6 1.9 -1.8 0.5 5 66864 18 34 24 1.133 307.7 2.4 -1.3 0.8 5 67074 18 37 54 1.126 308.4 1.6 -2.6 0.5 5 68124 18 55 24 1.100 311.3 1.3 -3.0 0.3 5 68633 19 03 53 1.089 310.0 0.4 -3.0 0.2 5 69827 19 23 47 1.069 311.0 1.4 -2.2 0.4 5 70034 19 27 14 1.066 309.5 1.7 -1.9 0.5 5 71085 19 44 45 1.054 310.6 1.2 -2.9 0.3 5 71593 19 53 13 1.051 307.7 3.2 -1.3 0.9 5 72783 20 13 03 1.047 309.4 4.1 -1.6 0.8 5 72993 20 16 33 1.047 310.8 1.4 -2.6 0.1 5 73648 20 27 28 1.048 312.4 1.2 -3.0 0.3 5 74830 20 47 10 1.054 313.0 1.8 -2.3 0.3 5 75037 20 50 37 1.056 312.7 2.1 -2.2 0.5 5 76085 21 08 05 1.067 310.8 2.1 -2.1 0.8 5 76595 21 16 35 1.075 310.6 1.8 -2.7 0.5 5 77781 21 36 21 1.098 307.5 1.4 -1.9 0.4 5 77990 21 39 50 1.103 308.1 2.5 -1.1 0.5 5 79039 21 57 19 1.130 308.0 1.1 -1.8 0.4 5 79545 22 05 45 1.145 308.2 2.1 -1.7 0.8 5 80732 22 25 32 1.189 307.3 2.1 -1.3 0.6 5 80942 22 29 02 1.197 308.3 0.6 -0.6 0.2 5 81988 22 46 28 1.246 307.3 1.6 -0.2 0.4 5 82495 22 54 55 1.273 308.4 1.8 -0.3 0.5 5 84691 23 31 31 1.421 308.0 2.1 -0.6 0.4 5 85203 23 40 03 1.465 308.2 3.2 -0.2 0.7 5 85852 23 50 52 1.527 306.5 1.3 0.5 0.6 5 86950 00 09 10 1.649 307.3 2.5 0.3 0.8 5 87895 00 24 55 1.777 303.4 0.5 0.4 0.3 5 88408 00 33 28 1.858 302.2 1.4 0.4 0.4 5 89062 00 44 22 1.975 303.8 1.6 0.4 0.8 5