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 22 1995 10 22 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 54 009 37.25 122.03 0.0 277.1 2.5 -0.1 0.4 54702 15 11 42 5.895 253.7 2.2 -20.4 1.1 5 57861 16 04 21 3.137 275.8 0.3 -0.7 0.1 5 59280 16 27 60 2.618 277.4 0.3 -0.1 0.2 5 59902 16 38 22 2.450 278.4 0.9 -0.4 0.3 5 60109 16 41 49 2.399 278.5 0.6 -0.4 0.2 5 60632 16 50 32 2.284 278.5 0.7 -0.4 0.2 5 61146 16 59 06 2.184 278.6 0.7 -0.3 0.2 5 61876 17 11 16 2.062 280.3 1.0 -0.4 0.4 5 62394 17 19 54 1.987 281.4 0.9 -1.0 0.2 5 63019 17 30 19 1.908 278.4 1.6 0.1 0.4 5 63534 17 38 54 1.850 279.6 1.0 -0.2 0.3 5 64262 17 51 02 1.779 279.3 2.3 -0.2 0.6 5 64776 17 59 36 1.736 279.4 0.8 -0.1 0.3 5 65402 18 10 02 1.689 276.1 3.3 0.6 0.7 5 65917 18 18 37 1.656 277.5 0.8 0.3 0.4 5 66644 18 30 44 1.615 277.0 0.9 0.3 0.2 5 67158 18 39 18 1.590 278.8 2.6 -0.2 0.6 5 67785 18 49 45 1.565 278.6 2.2 -0.2 0.6 5 68298 18 58 18 1.547 278.5 1.6 -0.1 0.4 5 69026 19 10 26 1.528 277.7 1.4 -0.1 0.5 5 69540 19 19 00 1.516 279.1 1.0 -0.2 0.3 5 70350 19 32 30 1.504 277.8 0.9 0.0 0.2 5 70863 19 41 03 1.500 277.4 2.1 0.0 0.6 5 71591 19 53 11 1.498 281.0 1.4 -0.8 0.3 5 72104 20 01 44 1.499 280.0 0.4 -0.5 0.2 5 72914 20 15 14 1.506 277.8 1.3 0.0 0.2 5 73429 20 23 49 1.514 278.8 1.9 -0.1 0.5 5 74158 20 35 58 1.530 279.9 1.1 -0.7 0.3 5 74672 20 44 32 1.544 278.9 2.5 -0.3 0.6 5 75484 20 58 04 1.572 277.7 0.8 -0.2 0.3 5 75997 21 06 37 1.594 277.9 1.9 -0.2 0.6 5 76725 21 18 45 1.630 278.6 1.6 -0.3 0.4 5 77239 21 27 19 1.660 277.8 0.8 -0.2 0.4 5 77866 21 37 46 1.702 279.0 1.4 -0.3 0.3 5 80327 22 18 47 1.940 277.9 1.1 0.0 0.4 5 80534 22 22 14 1.966 279.1 2.0 -0.3 0.7 5 80742 22 25 42 1.994 278.0 1.6 0.1 0.6 5 81453 22 37 33 2.101 274.7 0.5 0.3 0.2 5 81664 22 41 04 2.136 274.6 0.3 0.3 0.0 5 81872 22 44 32 2.173 274.2 0.7 0.4 0.2 5 82080 22 48 00 2.211 273.8 0.3 0.6 0.1 5 82288 22 51 28 2.251 273.9 0.3 0.5 0.2 5 82496 22 54 56 2.293 274.7 0.8 0.4 0.2 5 83204 23 06 44 2.456 274.3 0.8 0.2 0.2 5 83413 23 10 13 2.509 274.4 0.6 0.2 0.2 5 83621 23 13 41 2.566 273.7 0.4 0.3 0.1 5 83828 23 17 08 2.626 273.9 0.7 0.1 0.2 5 84037 23 20 37 2.690 272.6 0.7 0.5 0.3 5 84245 23 24 05 2.757 273.1 0.7 0.2 0.3 5 85134 23 38 54 3.098 271.7 0.4 -0.2 0.1 5 85346 23 42 26 3.195 271.4 0.8 -0.5 0.2 5 85558 23 45 58 3.298 270.1 0.5 -0.4 0.2 5 87471 00 17 51 4.705 261.3 1.4 -5.8 0.7 5 87987 00 26 27 5.319 257.8 1.9 -11.4 0.7 5