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 27 1995 10 27 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 0.0 260.3 5.9 -3.0 0.8 59789 16 36 29 2.601 247.6 0.6 -1.6 0.3 5 60566 16 49 26 2.405 249.2 0.7 -1.7 0.3 5 61081 16 58 01 2.295 250.5 0.7 -2.0 0.3 5 61595 17 06 35 2.198 251.7 0.6 -2.1 0.2 5 62815 17 26 55 2.011 253.0 1.3 -1.8 0.3 5 64420 17 53 40 1.833 258.2 1.5 -2.7 0.4 5 65149 18 05 49 1.771 259.6 0.7 -3.0 0.2 5 65664 18 14 24 1.733 261.0 1.7 -3.2 0.6 5 66394 18 26 34 1.687 262.6 1.6 -3.8 0.4 5 67122 18 38 42 1.649 262.3 0.9 -3.3 0.2 5 67637 18 47 17 1.626 263.1 1.0 -3.6 0.4 5 68367 18 59 27 1.599 263.9 1.6 -3.7 0.2 5 69095 19 11 35 1.579 264.2 1.9 -3.8 0.4 5 69610 19 20 10 1.568 265.7 1.6 -4.0 0.6 5 70340 19 32 20 1.557 264.3 1.8 -3.7 0.5 5 71067 19 44 27 1.551 265.2 1.2 -3.9 0.4 5 71581 19 53 01 1.551 266.3 1.6 -4.2 0.5 5 75245 20 54 05 1.621 262.8 1.6 -3.1 0.4 5 76264 21 11 04 1.668 266.5 1.1 -3.6 0.3 5 76780 21 19 40 1.697 265.9 2.1 -3.5 0.7 5 77511 21 31 51 1.745 264.9 2.6 -3.1 0.6 5 78532 21 48 52 1.828 262.8 2.2 -2.7 0.5 5 79052 21 57 32 1.877 263.8 0.6 -3.5 0.2 5 79783 22 09 43 1.959 262.3 1.7 -2.5 0.2 5 84833 23 33 53 3.176 254.0 0.5 -1.5 0.1 5