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 26 1996 07 26 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 36 009 37.42 122.58 0.0 315.9 2.2 -1.7 1.1 59782 16 36 22 1.580 308.0 4.7 -1.0 1.9 5 60857 16 54 17 1.473 306.0 3.6 -1.9 0.9 5 62307 17 18 27 1.357 312.7 3.2 -2.4 0.9 5 62955 17 29 15 1.315 314.9 2.7 -2.7 0.6 5 64029 17 47 09 1.254 314.9 1.3 -2.4 0.4 5 64235 17 50 35 1.244 314.7 1.5 -2.7 0.4 5 65465 18 11 05 1.188 313.3 1.6 -2.2 0.4 5 65975 18 19 35 1.169 314.0 0.4 -2.3 0.2 5 67163 18 39 23 1.130 317.6 1.9 -3.2 0.3 5 67370 18 42 50 1.125 315.7 2.0 -2.8 0.3 5 68603 19 03 23 1.095 313.2 1.5 -2.9 0.5 5 69112 19 11 52 1.086 313.7 4.8 -2.3 1.3 5 71564 19 52 44 1.056 307.9 4.8 -2.5 1.4 5 72072 20 01 12 1.054 313.6 1.0 -3.8 0.5 5 73555 20 25 55 1.053 318.4 0.7 -3.0 0.2 5 74737 20 45 37 1.058 319.3 2.8 -2.9 0.7 5 74944 20 49 04 1.060 319.3 1.7 -2.7 0.6 5 75988 21 06 28 1.071 316.8 1.8 -2.0 0.2 5 76495 21 14 55 1.079 315.5 0.8 -2.0 0.3 5 77683 21 34 43 1.101 315.9 1.5 -1.3 0.2 5 77890 21 38 10 1.105 317.3 1.7 -1.8 0.3 5 78937 21 55 37 1.133 316.7 1.4 -1.3 0.3 5 79444 22 04 04 1.149 318.2 1.1 -1.7 0.2 5 80632 22 23 52 1.192 318.4 1.6 -1.6 0.5 5 80839 22 27 19 1.200 319.3 2.3 -1.5 0.6 5 81886 22 44 46 1.249 317.7 3.0 -1.0 0.5 5 82393 22 53 13 1.276 317.9 3.5 -1.0 0.7 5 83593 23 13 13 1.350 315.8 1.3 -0.5 0.3 5 84535 23 28 55 1.420 316.4 0.9 -0.3 0.4 5 85051 23 37 31 1.464 309.4 3.6 0.4 0.9 5 85702 23 48 22 1.525 312.8 1.1 -0.2 0.3 5 86950 00 09 10 1.667 317.5 1.1 -0.6 0.3 5 87888 00 24 48 1.798 317.8 1.3 -0.5 0.4 5 88398 00 33 18 1.880 316.2 1.4 -0.1 0.3 5 89048 00 44 08 1.999 315.4 1.0 0.1 0.3 5 92682 01 44 42 3.179 309.9 2.4 -0.9 0.5 5