1 00:00:00,000 --> 00:00:01,310 2 00:00:01,330 --> 00:00:03,300 Every one of the instruments on here 3 00:00:03,320 --> 00:00:06,320 has had to be spec'd to work 4 00:00:06,340 --> 00:00:08,540 at phenomenal levels. 5 00:00:08,560 --> 00:00:11,210 So we're going to be flying in the background atmosphere. 6 00:00:11,230 --> 00:00:13,450 That usually means there's very little 7 00:00:13,470 --> 00:00:15,450 of whatever you're trying to measure. 8 00:00:15,470 --> 00:00:16,980 For something like CO2 9 00:00:17,000 --> 00:00:18,450 we need such high sensitivity - 10 00:00:18,470 --> 00:00:20,630 there's lots of CO2 there, 11 00:00:20,650 --> 00:00:23,690 so every tiny change in it makes a difference. 12 00:00:23,710 --> 00:00:25,220 For something like ozone, 13 00:00:25,240 --> 00:00:27,470 we're going to be looking at very small numbers 14 00:00:27,490 --> 00:00:29,000 in the background atmosphere. 15 00:00:29,020 --> 00:00:32,000 For something like NOx, NO and NO2, 16 00:00:32,020 --> 00:00:34,810 the numbers are the lowest, even today, 17 00:00:34,830 --> 00:00:36,810 the lowest that instrument has ever measured 18 00:00:36,830 --> 00:00:38,490 was earlier on in the flight today. 19 00:00:38,510 --> 00:00:41,470 So the instrument is a cavity enhanced system, 20 00:00:41,490 --> 00:00:43,370 so we take light from the laser 21 00:00:43,390 --> 00:00:45,570 and put it through a sampling cell. 22 00:00:45,590 --> 00:00:48,850 And then we look and see how much light disappears 23 00:00:48,870 --> 00:00:50,590 when we have a certain amount 24 00:00:50,610 --> 00:00:53,380 of any of the four gases that we measure. 25 00:00:53,400 --> 00:00:55,250 For a given amount of CO2 26 00:00:55,270 --> 00:00:56,720 that's in the atmosphere, 27 00:00:56,740 --> 00:00:58,380 a certain amount will be absorbed 28 00:00:58,400 --> 00:00:59,620 of the laser light 29 00:00:59,640 --> 00:01:01,130 and then we can tell from that 30 00:01:01,150 --> 00:01:02,990 how much CO2 there is. 31 00:01:03,010 --> 00:01:05,630 We do a lot of profiles over TCCON sites, 32 00:01:05,650 --> 00:01:08,440 which are sites that look up at the sun 33 00:01:08,460 --> 00:01:11,780 and give us a total column of CO2 and methane 34 00:01:11,800 --> 00:01:14,540 between that site and the sun. 35 00:01:14,560 --> 00:01:18,040 But we also fly underneath some of the satellites. 36 00:01:18,060 --> 00:01:20,320 So today we've been doing an underpass 37 00:01:20,340 --> 00:01:22,580 under the OCO-2 satellite, 38 00:01:22,600 --> 00:01:25,460 where they measure CO2 columns. 39 00:01:25,480 --> 00:01:27,630 So we'll be sending all of the CO2 profiles 40 00:01:27,650 --> 00:01:28,900 that we measure 41 00:01:28,920 --> 00:01:31,170 to the OCO2 team 42 00:01:31,190 --> 00:01:33,880 to help with the validation of their instrument. 43 00:01:33,900 --> 00:01:35,930 A project like ATom 44 00:01:35,950 --> 00:01:38,580 is ideally suited for that, 45 00:01:38,600 --> 00:01:40,830 so it just takes a little extra coordination 46 00:01:40,850 --> 00:01:43,110 to try and get the most out of that. 47 00:01:43,130 --> 00:01:44,340 Looking at the real time data 48 00:01:44,360 --> 00:01:46,030 does give us ideas about 49 00:01:46,050 --> 00:01:47,780 what we should be interested in 50 00:01:47,800 --> 00:01:49,480 when it comes to looking at the data. 51 00:01:49,500 --> 00:01:51,680 Because there is a huge amount of data 52 00:01:51,700 --> 00:01:54,350 that's going to be produced from ATom, 53 00:01:54,370 --> 00:01:56,310 so I think there'll be a lot 54 00:01:56,330 --> 00:01:58,370 of the wider science community 55 00:01:58,390 --> 00:02:00,210 who end up using this data set, 56 00:02:00,230 --> 00:02:02,230 and I can see it being invaluable 57 00:02:02,250 --> 00:02:05,230 to all the modeling community. 58 00:02:05,250 --> 00:02:06,440 From what I've heard from them, 59 00:02:06,460 --> 00:02:08,870 they are very excited about the whole project. 60 00:02:08,890 --> 00:02:15,716