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 16 1997 04 16 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 37 007 37.42 122.58 0.0 329.5 1.0 3.0 1.3 55985 15 33 05 2.544 329.7 0.8 -0.5 0.3 5 56726 15 45 26 2.320 330.2 1.4 0.3 0.3 5 57257 15 54 17 2.184 330.7 1.1 0.4 0.2 5 57789 16 03 09 2.065 329.2 2.5 1.1 0.7 5 59158 16 25 58 1.818 329.4 1.2 0.9 0.4 5 59890 16 38 10 1.714 327.4 4.0 2.3 1.1 5 60422 16 47 02 1.648 329.8 2.8 2.2 0.7 5 61154 16 59 14 1.567 329.8 2.2 2.6 0.7 5 62383 17 19 43 1.455 330.4 1.8 3.3 0.6 5 63416 17 36 56 1.380 327.9 2.2 4.2 0.6 5 63946 17 45 46 1.346 329.4 1.2 4.3 0.5 5 64678 17 57 58 1.305 327.7 2.6 5.2 0.5 5 65555 18 12 35 1.263 331.4 2.0 2.7 0.6 5 66084 18 21 24 1.241 329.2 0.8 3.4 0.3 5 66612 18 30 12 1.221 329.1 2.6 3.7 0.7 5 67141 18 39 01 1.203 328.5 1.3 4.1 0.4 5 68320 18 58 40 1.171 329.1 3.0 3.2 0.9 5 68848 19 07 28 1.159 329.4 1.0 3.6 0.4 5 69377 19 16 17 1.149 329.9 1.0 3.2 0.4 5 69904 19 25 04 1.141 327.4 1.6 4.0 0.6 5 71083 19 44 43 1.128 329.1 0.8 3.0 0.3 5 71611 19 53 31 1.124 328.6 2.2 2.9 0.6 5 72139 20 02 19 1.122 328.1 2.2 3.3 0.7 5 72668 20 11 08 1.121 329.2 2.5 3.3 0.3 5 73403 20 23 23 1.123 327.0 1.8 4.2 0.3 5 75214 20 53 34 1.139 329.9 1.5 4.0 0.4 5 75742 21 02 22 1.147 329.9 2.9 4.2 0.6 5 76270 21 11 10 1.157 329.2 1.2 4.2 0.3 5 77450 21 30 50 1.185 329.4 1.3 4.0 0.4 5 77979 21 39 39 1.200 331.1 1.3 3.9 0.4 5 78508 21 48 28 1.217 330.4 1.6 3.8 0.2 5 79746 22 09 06 1.267 329.4 2.3 4.3 0.6 5 84761 23 32 41 1.643 330.1 0.8 3.5 0.4 5 85798 23 49 58 1.779 330.6 1.2 2.9 0.3 5 86336 23 58 56 1.861 330.1 1.3 2.9 0.3 5 87081 00 11 21 1.994 330.4 1.7 2.6 0.4 5 90843 01 14 03 3.236 332.5 1.9 -1.1 0.6 5