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 Moffett Field ( 37.42, 122.58) STRAT 1 1 1996 01 28 1996 01 28 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. Moffett Field 22 009 37.42 122.58 0.0 327.4 2.6 -2.6 0.3 63767 17 42 47 2.537 321.7 0.5 -2.0 0.2 5 64497 17 54 57 2.389 323.5 0.6 -2.2 0.2 5 65008 18 03 28 2.300 324.7 1.3 -2.3 0.3 5 65519 18 11 59 2.222 325.5 1.3 -2.3 0.4 5 66732 18 32 12 2.071 327.8 2.1 -2.3 0.5 5 67244 18 40 44 2.019 328.2 1.4 -2.4 0.4 5 67759 18 49 19 1.973 329.3 0.9 -3.1 0.3 5 69824 19 23 44 1.840 328.6 0.9 -2.1 0.4 5 70548 19 35 48 1.809 329.7 1.6 -2.6 0.5 5 71060 19 44 20 1.792 331.2 1.9 -2.8 0.5 5 71786 19 56 26 1.774 331.1 1.5 -2.9 0.3 5 72511 20 08 31 1.763 330.6 1.7 -2.9 0.5 5 73023 20 17 03 1.759 330.0 0.5 -2.7 0.1 5 73753 20 29 13 1.759 329.0 1.6 -2.7 0.3 5 74769 20 46 09 1.770 327.6 1.2 -2.6 0.2 5 75280 20 54 40 1.780 326.8 0.7 -2.6 0.2 5 76007 21 06 47 1.800 327.1 1.7 -2.7 0.4 5 77023 21 23 43 1.841 326.1 2.4 -2.6 0.6 5 77534 21 32 14 1.867 326.7 1.9 -2.9 0.6 5 78262 21 44 22 1.912 326.3 1.6 -3.0 0.3 5 79276 22 01 16 1.992 323.9 0.8 -2.7 0.3 5 85063 23 37 43 3.132 309.5 3.4 -1.7 0.8 5