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 18 1996 07 18 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 32 009 37.42 122.58 0.0 315.6 2.3 -1.9 1.1 65678 18 14 38 1.166 311.6 1.1 -2.9 0.2 5 65885 18 18 05 1.159 309.6 1.0 -2.4 0.3 5 66938 18 35 38 1.125 312.9 0.9 -3.0 0.2 5 67448 18 44 08 1.111 311.3 1.5 -2.3 0.4 5 68652 19 04 12 1.084 314.8 1.1 -3.1 0.3 5 68859 19 07 39 1.080 315.5 1.8 -3.4 0.5 5 69914 19 25 14 1.063 316.2 1.7 -3.3 0.6 5 70421 19 33 41 1.057 315.6 2.3 -2.8 0.5 5 71626 19 53 46 1.046 315.7 2.4 -2.6 0.5 5 71834 19 57 14 1.045 316.3 2.1 -2.7 0.5 5 72891 20 14 51 1.043 315.8 0.6 -2.6 0.3 5 73841 20 30 41 1.044 315.5 1.8 -2.4 0.3 5 75032 20 50 32 1.051 317.4 1.5 -2.8 0.3 5 75239 20 53 59 1.053 318.7 2.5 -3.1 0.7 5 76293 21 11 33 1.066 317.7 0.7 -2.7 0.2 5 76801 21 20 01 1.074 318.0 1.3 -2.6 0.2 5 78006 21 40 06 1.098 316.5 3.5 -2.3 1.0 5 78213 21 43 33 1.103 316.1 1.0 -2.0 0.3 5 79268 22 01 08 1.132 316.5 1.6 -1.9 0.3 5 79776 22 09 36 1.148 314.8 0.8 -1.4 0.2 5 80979 22 29 39 1.193 319.3 1.7 -2.3 0.6 5 81186 22 33 06 1.202 317.2 1.6 -1.6 0.3 5 82241 22 50 41 1.252 317.0 2.7 -1.2 0.6 5 82753 22 59 13 1.280 319.8 1.3 -1.4 0.3 5 83967 23 19 27 1.357 316.9 2.7 -0.9 0.7 5 84914 23 35 14 1.430 315.8 2.0 -0.5 0.5 5 85425 23 43 45 1.475 315.0 1.0 -0.4 0.2 5 86083 23 54 43 1.538 315.5 1.0 -0.2 0.4 5 86961 00 09 21 1.637 314.6 1.5 0.0 0.4 5 87909 00 25 09 1.763 315.8 1.8 -0.1 0.4 5 88421 00 33 41 1.842 313.9 2.0 0.3 0.3 5 89084 00 44 44 1.957 314.7 1.3 -0.3 0.3 5