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 19 1997 04 19 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 23 007 37.42 122.58 0.0 309.7 1.4 1.6 0.8 56929 15 48 49 2.208 309.1 1.9 0.4 0.6 5 57458 15 57 38 2.086 309.3 2.5 0.4 0.9 5 57987 16 06 27 1.978 309.3 3.3 0.7 0.7 5 58874 16 21 14 1.825 310.8 2.6 0.3 1.0 5 59603 16 33 23 1.720 310.4 1.5 2.2 1.2 5 60333 16 45 33 1.629 311.3 1.0 1.9 0.4 5 61062 16 57 42 1.551 308.0 0.8 2.9 0.3 5 61936 17 12 16 1.470 311.7 1.6 0.9 0.4 5 62965 17 29 25 1.391 307.6 1.5 2.3 0.3 5 63493 17 38 13 1.356 310.2 1.8 2.0 0.7 5 64216 17 50 16 1.313 309.3 2.3 2.6 0.6 5 65751 18 15 51 1.240 307.9 4.3 1.1 0.9 5 66278 18 24 38 1.219 311.2 1.3 1.3 0.4 5 66805 18 33 25 1.201 309.8 2.9 1.3 0.6 5 67339 18 42 19 1.184 308.6 2.0 1.2 0.4 5 71821 19 57 01 1.113 311.4 4.8 1.9 1.4 5 77431 21 30 31 1.174 310.5 2.7 1.5 0.6 5 77965 21 39 25 1.189 310.9 4.8 1.4 1.0 5 79030 21 57 10 1.225 312.4 3.6 1.0 1.0 5 83903 23 18 23 1.534 315.0 2.9 0.5 0.6 5 85973 23 52 53 1.781 308.1 2.4 1.9 0.6 5 86529 00 02 09 1.867 309.5 2.6 1.5 0.6 5 87259 00 14 19 1.999 310.6 1.5 0.9 0.9 5