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) POLARIS 1 1 1997 04 17 1997 04 17 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 40 007 37.42 122.58 0.0 329.8 1.5 3.5 1.4 55838 15 30 38 2.568 326.3 1.1 -0.5 0.1 5 57764 16 02 44 2.053 329.8 1.2 1.0 0.3 5 59031 16 23 51 1.826 330.7 0.8 1.4 0.2 5 59760 16 36 00 1.720 331.0 2.6 2.4 0.5 5 60295 16 44 55 1.653 328.8 1.9 2.9 0.6 5 61019 16 56 59 1.572 330.1 1.0 3.8 0.5 5 63253 17 34 13 1.384 329.8 1.5 5.5 0.5 5 63783 17 43 03 1.350 328.7 2.3 6.1 0.5 5 64506 17 55 06 1.309 326.9 1.6 7.0 0.4 5 65769 18 16 09 1.249 332.6 2.5 3.3 0.7 5 66297 18 24 57 1.228 331.2 3.8 3.6 0.8 5 66825 18 33 45 1.209 332.9 2.0 3.3 0.5 5 67353 18 42 33 1.192 330.0 1.3 4.0 0.5 5 68521 19 02 01 1.162 331.2 1.2 3.3 0.4 5 69048 19 10 48 1.151 328.8 1.8 4.2 0.4 5 69576 19 19 36 1.142 329.0 2.7 4.2 0.7 5 70104 19 28 24 1.134 330.0 2.6 4.0 0.8 5 71272 19 47 52 1.123 329.2 1.5 3.3 0.6 5 71800 19 56 40 1.120 331.4 2.2 2.7 0.5 5 72327 20 05 27 1.119 329.3 1.7 3.4 0.3 5 73353 20 22 33 1.120 329.8 2.4 4.0 0.7 5 74625 20 43 45 1.129 328.0 2.4 4.0 0.7 5 75153 20 52 33 1.135 329.2 1.5 3.8 0.3 5 75681 21 01 21 1.143 330.0 2.1 3.9 0.6 5 76209 21 10 09 1.152 330.6 1.8 3.7 0.5 5 77377 21 29 37 1.179 330.0 2.1 3.9 0.4 5 77905 21 38 25 1.194 328.9 2.3 4.4 0.5 5 78433 21 47 13 1.211 331.1 3.0 3.9 0.7 5 78961 21 56 01 1.230 330.9 1.8 3.7 0.5 5 80129 22 15 29 1.280 330.8 3.6 3.9 0.9 5 80657 22 24 17 1.307 330.0 3.1 4.3 0.7 5 81527 22 38 47 1.357 332.1 1.3 2.9 0.3 5 82550 22 55 50 1.428 330.7 2.3 3.6 0.6 5 83079 23 04 39 1.470 329.7 0.8 3.5 0.4 5 83803 23 16 43 1.536 329.8 1.8 2.9 0.7 5 84837 23 33 57 1.646 330.6 3.0 2.9 0.6 5 85866 23 51 06 1.781 329.1 1.8 2.6 0.5 5 86413 24 00 13 1.865 329.0 1.5 2.5 0.3 5 87151 00 12 31 1.997 332.1 3.3 1.6 0.7 5 90883 01 14 43 3.231 326.4 2.0 -0.3 0.5 5