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 27 1996 07 27 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 33 009 37.42 122.58 0.0 313.0 3.5 -2.1 0.7 54826 15 13 46 2.560 297.6 2.8 0.0 0.5 5 55479 15 24 39 2.358 304.8 0.6 -1.1 0.2 5 55991 15 33 11 2.222 305.5 1.6 -0.9 0.5 5 56505 15 41 45 2.101 306.0 1.3 -0.5 0.3 5 57986 16 06 26 1.824 309.2 1.2 -1.3 0.5 5 58634 16 17 14 1.727 311.0 1.0 -1.5 0.4 5 59144 16 25 44 1.659 312.2 0.7 -1.9 0.2 5 59791 16 36 31 1.584 314.0 1.2 -2.4 0.5 5 60861 16 54 21 1.476 315.7 2.0 -2.7 0.6 5 61799 17 09 59 1.398 315.5 4.0 -2.5 0.8 5 62311 17 18 31 1.360 316.6 1.2 -3.4 0.2 5 62958 17 29 18 1.317 316.8 2.7 -2.7 0.5 5 64035 17 47 15 1.255 315.7 1.8 -2.1 0.5 5 64241 17 50 41 1.245 316.2 2.7 -2.4 0.4 5 65379 18 09 39 1.194 315.3 1.7 -2.4 0.4 5 65886 18 18 06 1.174 315.8 1.5 -2.4 0.3 5 67073 18 37 53 1.135 313.9 2.0 -1.9 0.5 5 67280 18 41 20 1.129 314.1 1.8 -2.1 0.5 5 68327 18 58 47 1.103 316.9 0.6 -2.5 0.2 5 68833 19 07 13 1.092 316.4 1.7 -2.6 0.5 5 70020 19 27 00 1.073 314.1 2.4 -1.9 0.6 5 70227 19 30 27 1.070 314.4 2.2 -2.0 0.5 5 71278 19 47 58 1.060 316.6 1.7 -3.2 0.5 5 71786 19 56 26 1.056 314.3 2.5 -2.9 0.6 5 72980 20 16 20 1.054 313.3 1.8 -2.4 0.4 5 73635 20 27 15 1.054 312.0 4.0 -2.0 1.3 5 74821 20 47 01 1.060 312.9 1.5 -2.7 0.9 5 75032 20 50 32 1.062 314.4 1.8 -3.2 0.5 5 76083 21 08 03 1.074 317.0 3.6 -2.2 0.9 5 76596 21 16 36 1.082 314.4 1.4 -2.4 0.4 5 78001 21 40 01 1.110 312.6 2.9 -0.7 1.3 5 79051 21 57 31 1.138 311.6 1.5 -1.8 0.3 5 79561 22 06 01 1.154 309.2 2.3 -1.1 0.5 5