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 23 1995 10 23 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 48 009 37.25 122.03 0.0 283.4 4.4 0.0 0.4 57935 16 05 35 3.139 286.3 0.5 -0.7 0.2 5 58957 16 22 37 2.746 286.7 1.1 0.1 0.2 5 59576 16 32 56 2.559 288.1 1.1 0.2 0.3 5 59784 16 36 24 2.503 287.7 1.2 0.2 0.4 5 60298 16 44 58 2.377 288.9 1.1 0.1 0.3 5 60820 16 53 40 2.266 287.6 1.1 0.3 0.3 5 61334 17 02 14 2.168 289.2 1.3 -0.1 0.4 5 62061 17 14 21 2.050 288.6 1.0 -0.1 0.3 5 62573 17 22 53 1.979 288.6 1.8 -0.2 0.4 5 63200 17 33 20 1.901 288.4 1.4 0.1 0.3 5 63714 17 41 54 1.846 287.7 0.8 0.3 0.1 5 64444 17 54 04 1.776 289.8 0.8 -0.8 0.1 5 64958 18 02 38 1.734 289.0 1.4 -0.5 0.5 5 65582 18 13 02 1.689 285.8 1.2 0.2 0.3 5 66096 18 21 36 1.657 285.3 1.5 0.3 0.5 5 66821 18 33 41 1.618 286.8 1.1 -0.2 0.5 5 67335 18 42 15 1.594 286.1 1.9 -0.2 0.4 5 68052 18 54 12 1.566 282.0 2.0 0.6 0.4 5 68566 19 02 46 1.550 279.8 1.0 1.2 0.3 5 69294 19 14 54 1.532 282.0 0.9 0.6 0.3 5 69807 19 23 27 1.522 282.1 1.4 0.7 0.4 5 70707 19 38 27 1.511 285.3 1.3 -0.2 0.4 5 71220 19 47 00 1.508 284.0 0.5 0.2 0.2 5 71949 19 59 09 1.509 286.3 1.6 -0.7 0.5 5 72462 20 07 42 1.512 284.6 1.8 -0.3 0.4 5 73272 20 21 12 1.522 282.7 1.8 0.0 0.4 5 73786 20 29 46 1.532 282.3 1.5 0.1 0.5 5 74513 20 41 53 1.550 281.8 0.7 0.0 0.2 5 75026 20 50 26 1.567 281.5 1.3 0.1 0.2 5 75651 21 00 51 1.590 282.7 1.9 0.0 0.5 5 76164 21 09 24 1.613 283.8 3.0 -0.3 0.7 5 76892 21 21 32 1.652 283.8 1.4 -0.4 0.2 5 77406 21 30 06 1.684 284.1 0.7 -0.4 0.2 5 78214 21 43 34 1.743 281.3 1.4 0.3 0.3 5 78729 21 52 09 1.786 280.9 2.2 0.5 0.7 5 79455 22 04 15 1.856 279.8 1.9 0.4 0.6 5 79971 22 12 51 1.914 278.7 1.9 0.6 0.3 5 80598 22 23 18 1.993 280.0 1.0 -0.2 0.3 5 81116 22 31 56 2.068 279.6 1.5 -0.2 0.3 5 81848 22 44 08 2.190 278.4 1.1 0.1 0.4 5 82362 22 52 42 2.289 278.1 1.0 0.1 0.2 5 83260 23 07 40 2.498 277.1 0.7 0.0 0.2 5 83775 23 16 15 2.641 275.0 1.1 0.3 0.3 5 84508 23 28 28 2.886 273.5 1.1 0.0 0.4 5 85026 23 37 06 3.093 272.4 0.8 -0.2 0.3 5 85545 23 45 45 3.340 271.1 1.1 -0.5 0.2 5 87161 00 12 41 4.480 265.8 0.9 -4.7 0.4 5 87678 00 21 18 5.035 262.4 1.9 -9.5 1.1 5