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 NASA Ames ( 37.42, 122.58) STRAT 1 1 1996 07 25 1996 07 25 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. NASA Ames 37 009 37.42 122.58 0.0 316.5 3.5 -1.4 1.1 61827 17 10 27 1.390 308.9 1.4 -1.9 0.4 5 62336 17 18 56 1.353 308.0 2.6 -1.6 0.6 5 62985 17 29 45 1.310 310.7 2.1 -2.1 0.6 5 64065 17 47 45 1.250 312.2 1.1 -2.4 0.4 5 64271 17 51 11 1.240 314.1 1.0 -2.8 0.2 5 65500 18 11 40 1.185 314.5 1.5 -2.9 0.3 5 66009 18 20 09 1.166 314.1 3.1 -2.8 0.7 5 67195 18 39 55 1.128 311.8 2.4 -2.2 0.5 5 67402 18 43 22 1.123 312.2 1.9 -2.3 0.5 5 68449 19 00 49 1.097 316.5 2.5 -3.2 0.7 5 68959 19 09 19 1.087 315.3 0.9 -3.0 0.3 5 70147 19 29 07 1.068 312.4 2.8 -2.2 0.6 5 70354 19 32 34 1.066 311.6 2.9 -2.1 0.6 5 71401 19 50 01 1.056 310.8 2.1 -1.6 0.6 5 71907 19 58 27 1.053 310.4 1.9 -1.4 0.5 5 73625 20 27 05 1.051 319.9 1.3 -3.0 0.4 5 74807 20 46 47 1.058 316.4 1.6 -1.9 0.5 5 75014 20 50 14 1.059 316.9 1.3 -2.1 0.4 5 76061 21 07 41 1.071 317.9 0.3 -1.8 0.1 5 76567 21 16 07 1.079 317.9 2.7 -1.6 0.6 5 77754 21 35 54 1.101 316.9 2.5 -1.1 0.6 5 77961 21 39 21 1.106 317.0 1.6 -1.1 0.2 5 79006 21 56 46 1.133 318.5 2.0 -1.0 0.6 5 79513 22 05 13 1.149 320.2 1.9 -1.2 0.6 5 80701 22 25 01 1.193 320.7 1.1 -1.3 0.3 5 80908 22 28 28 1.201 321.9 1.8 -1.5 0.5 5 81954 22 45 54 1.250 319.5 1.6 -0.7 0.5 5 82465 22 54 25 1.277 320.1 1.2 -0.7 0.5 5 83663 23 14 23 1.352 318.2 1.2 -0.2 0.3 5 84602 23 30 02 1.422 317.9 1.8 0.0 0.4 5 85112 23 38 32 1.466 319.2 1.9 -0.3 0.6 5 85763 23 49 23 1.528 318.1 0.9 0.1 0.3 5 86950 00 09 10 1.661 318.9 1.9 0.1 0.6 5 87894 00 24 54 1.793 318.2 1.3 -0.1 0.3 5 88408 00 33 28 1.875 318.4 1.6 0.0 0.4 5 89059 00 44 19 1.994 317.6 0.4 0.2 0.2 5 92719 01 45 19 3.178 313.2 2.6 -0.8 1.2 5