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 21 1996 07 21 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 49 009 37.42 122.58 0.0 309.6 5.3 -0.9 0.8 54534 15 08 54 2.585 294.5 1.2 -0.3 0.2 5 55187 15 19 47 2.379 296.7 0.7 -0.5 0.2 5 55698 15 28 18 2.241 296.9 0.8 -0.2 0.1 5 56209 15 36 49 2.119 298.3 0.8 -0.5 0.2 5 57816 16 03 36 1.817 301.9 1.9 -0.4 0.5 5 58467 16 14 27 1.721 304.7 1.7 -0.9 0.4 5 58977 16 22 57 1.654 304.4 2.0 -0.8 0.3 5 59627 16 33 47 1.578 302.5 2.1 -0.3 0.4 5 60700 16 51 40 1.471 304.1 1.5 -0.3 0.6 5 61637 17 07 17 1.393 307.7 1.3 -1.1 0.4 5 62146 17 15 46 1.355 309.0 2.1 -1.3 0.5 5 62794 17 26 34 1.312 306.6 1.9 -0.7 0.3 5 63867 17 44 27 1.252 310.8 1.3 -1.9 0.4 5 64074 17 47 54 1.241 311.8 1.9 -2.0 0.4 5 65120 18 05 20 1.193 310.8 1.9 -1.9 0.5 5 65628 18 13 48 1.173 309.5 1.4 -1.7 0.3 5 66815 18 33 35 1.133 309.7 1.3 -1.5 0.6 5 67021 18 37 01 1.126 310.6 2.3 -1.6 0.4 5 68067 18 54 27 1.100 310.5 1.5 -1.9 0.3 5 68577 19 02 57 1.089 312.1 1.3 -2.1 0.3 5 69767 19 22 47 1.068 312.4 1.7 -2.1 0.6 5 69974 19 26 14 1.065 313.8 2.1 -2.4 0.4 5 71022 19 43 42 1.054 311.4 1.0 -1.9 0.2 5 71528 19 52 08 1.050 312.6 2.9 -2.0 0.8 5 72719 20 11 59 1.046 312.2 0.7 -1.6 0.2 5 72926 20 15 26 1.046 314.1 1.4 -2.0 0.4 5 73576 20 26 16 1.047 313.8 1.5 -1.6 0.3 5 74759 20 45 59 1.052 312.5 1.9 -1.0 0.4 5 74966 20 49 26 1.054 315.2 1.5 -1.5 0.4 5 76013 21 06 53 1.065 315.1 1.7 -1.3 0.5 5 76518 21 15 18 1.073 313.6 2.5 -1.1 0.5 5 77708 21 35 08 1.095 315.5 1.8 -1.3 0.3 5 77915 21 38 35 1.100 313.9 2.1 -0.8 0.4 5 78770 21 52 50 1.121 315.3 1.2 -1.2 0.3 5 79946 22 12 26 1.157 312.6 1.7 -0.4 0.5 5 80153 22 15 53 1.165 312.6 1.5 -0.5 0.6 5 81198 22 33 18 1.207 310.9 2.0 0.1 0.3 5 81709 22 41 49 1.230 310.2 1.6 0.2 0.4 5 82895 23 01 35 1.294 311.9 2.7 0.0 0.6 5 83102 23 05 02 1.306 311.9 1.9 0.0 0.1 5 83887 23 18 07 1.358 311.8 0.4 0.0 0.1 5 84826 23 33 46 1.429 312.6 1.5 0.1 0.3 5 85336 23 42 16 1.474 312.9 2.9 0.0 0.7 5 85985 23 53 05 1.537 311.3 1.7 0.3 0.4 5 86957 00 09 17 1.646 312.9 0.5 0.4 0.4 5 87900 00 25 00 1.774 311.6 1.3 0.2 0.3 5 88415 00 33 35 1.854 311.9 1.3 0.2 0.4 5 89066 00 44 26 1.970 311.1 2.0 0.7 0.5 5 92860 01 47 40 3.178 305.7 2.6 -0.6 1.4 5