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 20 1997 04 20 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 32 007 37.42 122.58 0.0 300.1 1.9 2.5 1.2 55667 15 27 47 2.550 298.7 1.0 0.0 0.3 5 56403 15 40 03 2.325 297.5 0.6 1.0 0.2 5 56934 15 48 54 2.189 298.8 1.9 0.8 0.5 5 57464 15 57 44 2.068 299.7 1.8 1.0 0.4 5 59575 16 32 55 1.713 299.4 1.8 1.4 0.6 5 60112 16 41 52 1.646 297.6 3.0 2.1 0.5 5 60846 16 54 06 1.565 298.4 0.9 2.0 0.2 5 62071 17 14 31 1.452 300.1 2.0 2.8 0.6 5 63110 17 31 50 1.375 296.6 2.3 3.3 0.5 5 63645 17 40 45 1.341 299.2 2.4 3.4 0.5 5 64381 17 53 01 1.299 297.9 1.4 3.7 0.3 5 65258 18 07 38 1.256 303.5 3.8 1.8 0.8 5 65793 18 16 33 1.233 297.1 2.8 3.0 0.6 5 66326 18 25 26 1.213 298.7 1.2 3.0 0.3 5 66860 18 34 20 1.195 302.7 1.3 2.2 0.5 5 68044 18 54 04 1.162 300.4 3.0 2.7 0.6 5 68577 19 02 57 1.149 301.9 1.4 2.6 0.5 5 69105 19 11 45 1.139 303.0 2.2 2.8 0.8 5 69639 19 20 39 1.130 299.5 1.0 3.4 0.2 5 70824 19 40 24 1.116 298.1 4.9 2.9 1.0 5 71351 19 49 11 1.112 304.0 2.6 2.1 0.8 5 71879 19 57 59 1.110 302.1 2.2 2.5 0.5 5 72408 20 06 48 1.109 302.7 2.4 2.8 0.8 5 73445 20 24 05 1.110 300.8 0.6 4.5 0.2 5 74728 20 45 28 1.120 301.6 0.6 3.8 0.3 5 75257 20 54 17 1.127 304.3 2.7 3.5 0.5 5 75786 21 03 06 1.135 302.4 0.9 3.9 0.4 5 76315 21 11 55 1.145 302.7 2.9 4.0 0.8 5 77495 21 31 35 1.172 302.5 2.6 4.0 0.6 5 78558 21 49 18 1.205 306.0 3.4 3.3 0.6 5 79093 21 58 13 1.224 305.7 4.2 2.9 1.5 5 91030 01 17 10 3.232 302.4 3.6 0.5 1.0 5