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 26 1995 10 26 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 25 009 37.25 122.03 0.0 258.8 4.0 -3.5 0.7 59730 16 35 30 2.592 253.9 0.6 -2.5 0.2 5 60474 16 47 54 2.403 255.5 1.0 -2.8 0.4 5 60989 16 56 29 2.293 256.1 0.5 -2.9 0.1 5 61504 17 05 04 2.195 256.5 0.8 -2.9 0.2 5 62721 17 25 21 2.007 259.4 0.3 -3.2 0.2 5 64273 17 51 13 1.833 256.5 1.2 -2.7 0.4 5 65001 18 03 21 1.770 259.9 0.9 -3.5 0.4 5 65518 18 11 58 1.731 260.2 1.6 -3.5 0.4 5 66249 18 24 09 1.683 261.0 1.3 -3.8 0.3 5 66977 18 36 17 1.645 263.3 2.1 -4.3 0.5 5 67491 18 44 51 1.621 262.8 2.3 -4.3 0.5 5 68222 18 57 02 1.593 262.8 0.9 -4.3 0.3 5 68949 19 09 09 1.572 262.5 1.3 -4.5 0.4 5 69463 19 17 43 1.560 263.5 0.7 -4.6 0.3 5 70194 19 29 54 1.548 260.2 0.9 -4.0 0.4 5 71673 19 54 33 1.540 258.8 1.2 -3.8 0.4 5 72694 20 11 34 1.546 262.9 1.5 -4.7 0.4 5 75548 20 59 08 1.622 260.6 2.1 -3.8 0.5 5 76569 21 16 09 1.672 259.7 0.7 -3.7 0.3 5 77084 21 24 44 1.702 259.5 0.8 -3.8 0.4 5 77814 21 36 54 1.754 257.8 1.5 -3.5 0.3 5 78836 21 53 56 1.841 257.7 2.3 -3.3 0.6 5 79352 22 02 32 1.893 257.5 0.5 -3.2 0.3 5 80083 22 14 43 1.979 256.2 0.7 -3.0 0.2 5 84932 23 35 32 3.178 244.5 0.8 -1.7 0.2 5