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 ( 37.25, 122.03) STRAT 1 1 1995 10 25 1995 10 25 0 12 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 17 009 37.25 122.03 0.0 287.3 8.4 -3.4 0.7 64130 17 48 50 1.832 292.4 1.2 -3.8 0.3 5 64857 18 00 57 1.768 292.4 1.3 -3.5 0.3 5 66832 18 33 52 1.640 295.5 1.8 -4.0 0.5 5 67347 18 42 27 1.616 295.5 1.4 -4.1 0.3 5 68077 18 54 37 1.587 295.6 2.0 -4.0 0.4 5 68804 19 06 44 1.565 297.4 0.9 -4.0 0.3 5 69317 19 15 17 1.552 297.3 0.9 -4.0 0.3 5 71681 19 54 41 1.529 286.8 1.5 -3.8 0.5 5 72699 20 11 39 1.535 288.2 0.8 -4.2 0.3 5 73212 20 20 12 1.543 288.2 0.4 -3.9 0.2 5 75979 21 06 19 1.628 283.4 1.1 -3.1 0.4 5 76998 21 23 18 1.684 282.8 1.3 -3.0 0.4 5 77512 21 31 52 1.718 281.6 1.2 -2.8 0.3 5 78241 21 44 01 1.773 280.6 2.2 -2.6 0.5 5 79260 22 01 00 1.868 280.6 1.8 -2.8 0.5 5 79776 22 09 36 1.924 280.2 2.0 -2.6 0.5 5 85029 23 37 09 3.180 265.8 0.6 -1.8 0.2 5