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 15 1997 04 15 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 28 007 37.42 122.58 0.0 345.2 2.1 3.7 1.2 56070 15 34 30 2.542 341.1 1.2 -0.8 0.4 5 61074 16 57 54 1.585 340.8 1.8 3.0 0.5 5 67325 18 42 05 1.202 347.4 2.1 2.3 0.6 5 67853 18 50 53 1.187 346.7 2.2 2.8 0.5 5 68381 18 59 41 1.174 346.9 3.4 2.8 0.7 5 68908 19 08 28 1.162 346.1 2.3 3.4 0.5 5 70076 19 27 56 1.142 345.2 2.4 3.9 0.7 5 70603 19 36 43 1.136 346.0 2.1 3.8 0.6 5 71131 19 45 31 1.131 344.5 2.1 4.2 0.4 5 71658 19 54 18 1.127 346.3 2.8 3.9 0.8 5 73330 20 22 10 1.126 343.7 4.4 4.1 0.9 5 74601 20 43 21 1.135 343.6 0.9 5.0 0.3 5 75128 20 52 08 1.142 342.8 2.4 4.9 0.5 5 75655 21 00 55 1.149 341.3 1.1 5.1 0.4 5 76182 21 09 42 1.159 343.6 1.4 5.3 0.3 5 77351 21 29 11 1.185 345.0 1.5 4.1 0.6 5 77879 21 37 59 1.201 347.0 1.5 3.6 0.7 5 78406 21 46 46 1.218 346.3 0.8 3.7 0.2 5 78934 21 55 34 1.237 345.2 1.7 4.1 0.4 5 80102 22 15 02 1.288 346.1 1.9 4.3 0.4 5 81273 22 34 33 1.351 347.1 2.5 4.6 0.6 5 82296 22 51 36 1.419 345.8 2.6 4.9 0.4 5 82825 23 00 25 1.460 346.7 1.6 4.4 0.3 5 83549 23 12 29 1.523 348.7 2.2 3.9 0.7 5 84725 23 32 05 1.646 345.9 1.9 3.2 0.4 5 85756 23 49 16 1.781 346.8 2.5 3.3 0.6 5 86292 23 58 12 1.863 345.7 1.6 3.1 0.6 5 90785 01 13 05 3.231 342.5 1.7 -1.4 0.8 5