WEBVTT Kind: captions Language: en 00:00:07.430 --> 00:00:08.430 Speaker walks to the podium. 00:00:08.430 --> 00:00:09.430 Thanks. 00:00:09.430 --> 00:00:10.570 So, you know when you are talking you see two or three experts in the field (points 00:00:10.570 --> 00:00:16.760 to the audience) you kind of get a little anxious, well, I got to work with 17 of them, 00:00:16.760 --> 00:00:18.670 and this represents our collective ideas and so I'll try to do it justice. 00:00:18.670 --> 00:00:19.940 Opening Slide: "Current Powell Center Work Groups" (shows list of groups and the tasks 00:00:19.940 --> 00:00:21.080 they are working on). 00:00:21.080 --> 00:00:28.280 We feel really fortunate to have been a part of the Powell Center, I mean the things that 00:00:28.280 --> 00:00:32.960 we were able to do in our 2 meetings and the interactions in between are things that we 00:00:32.960 --> 00:00:37.450 couldn't possibly have done any other way. 00:00:37.450 --> 00:00:41.670 So, that's not a plug for the Powell Center per se, although it sort of is, because our 00:00:41.670 --> 00:00:46.480 experience has been so positive, but there are a number of other working groups who are 00:00:46.480 --> 00:00:48.390 doing some pretty exciting things. 00:00:48.390 --> 00:00:55.880 I think we were maybe the first ones co-funded by NSF and so I think our focus on water and 00:00:55.880 --> 00:01:00.880 organic matter struck a nerve somewhere and I think there's a broader audience especially 00:01:00.880 --> 00:01:03.180 for focus on that topic. 00:01:03.180 --> 00:01:05.000 Title Slide: "The transport of dissolved organic matter by river networks from mountains to 00:01:05.000 --> 00:01:06.820 the sea: a re-examination of the role of flow across temporal and spatial scales". 00:01:06.820 --> 00:01:14.500 I should mention this title again, we proposed to look at dissolved organic matter by river 00:01:14.500 --> 00:01:18.420 networks from mountains to the sea, and the way we were thinking about this was re-examination 00:01:18.420 --> 00:01:21.420 of the role of flow across spatial and temporal scales. 00:01:21.420 --> 00:01:26.040 And it's kind of important that it's a re-examination because there's been a lot of work done on 00:01:26.040 --> 00:01:28.100 this topic but we collectively needed to put our heads together, look at some new data 00:01:28.100 --> 00:01:31.420 and think about new ways of explaining those relationships. 00:01:31.420 --> 00:01:33.210 Slide #1: List of people in work group and logos of their organizations 00:01:33.210 --> 00:01:36.530 So this is the list of people involved with the work group. 00:01:36.530 --> 00:01:45.650 We represent USGS but also a number of universities, both in the U.S. but also Canada and Sweden. 00:01:45.650 --> 00:01:50.979 Kevin McGuire left, he's the only one that gets a symbol that's an animal, everyone else 00:01:50.979 --> 00:01:53.340 I went with a classy logo, but he got the chicken or the turkey or whatever it is of 00:01:53.340 --> 00:01:54.340 Virginia Tech. 00:01:54.340 --> 00:01:59.390 Slide #2: List of questions next to pictures of the work group meeting. 00:01:59.390 --> 00:02:03.759 Our overarching questions were: how do the relationships between dissolved organic matter 00:02:03.759 --> 00:02:11.490 concentration and composition in stream discharge change as a function of time and as a function 00:02:11.490 --> 00:02:12.490 of space. 00:02:12.490 --> 00:02:16.629 And so, as probably any good Powell work group, we did a lot of this (demonstrates rubbing 00:02:16.629 --> 00:02:18.792 chin), you know, we rubbed our chins, you know like Hjalmar and Jamie were doing (points 00:02:18.792 --> 00:02:23.639 to a picture on the slide) - that wasn't posed, they were really doing that. 00:02:23.639 --> 00:02:29.450 We scribbled a lot on white boards and then at the end we write "all wrong" (points to 00:02:29.450 --> 00:02:30.450 another picture). 00:02:30.450 --> 00:02:32.489 And we drank a lot of your coffee, sorry about that. 00:02:32.489 --> 00:02:33.489 Slide #3: "The (Complex) Big Picture". 00:02:33.489 --> 00:02:34.489 Bullet points are described in speech. 00:02:34.489 --> 00:02:42.549 So the complex big picture (I got complex in every bullet) so the DOM is complex, and 00:02:42.549 --> 00:02:47.629 that complexity reflects the processes that produce, consume and change it. 00:02:47.629 --> 00:02:52.279 Unraveling those processes is key to understanding complex system behavior. 00:02:52.279 --> 00:02:57.419 And understanding complex system behavior is going to allow us to predict and understand 00:02:57.419 --> 00:03:01.530 a wide range of these issues, from contaminant transport to drinking water quality issues 00:03:01.530 --> 00:03:03.319 to carbon budgets. 00:03:03.319 --> 00:03:08.120 And the only way we've realized we're going to get there is with pretty big ideas, we 00:03:08.120 --> 00:03:11.879 need to look at these kind of broad patterns with large data sets, we need this cross-collaboration, 00:03:11.879 --> 00:03:17.569 we need ecologists and biogeochemists and soil scientists in the same room. 00:03:17.569 --> 00:03:23.700 We need new data analyses, like these CQ slopes, that's really important that we think of new 00:03:23.700 --> 00:03:29.290 ways, especially we said we're re-examining, and that's what we need to do, so we're thinking 00:03:29.290 --> 00:03:31.232 about data in new ways. 00:03:31.232 --> 00:03:33.909 And new analytical tools, you know that's certainly been a theme. 00:03:33.909 --> 00:03:36.819 We need to think of new ways to characterize organic matter. 00:03:36.819 --> 00:03:42.549 We have some now, we're using that data, SUBA is just one and it's pretty limited in what 00:03:42.549 --> 00:03:45.379 it can tell us, but it's the largest data set we have to work with. 00:03:45.379 --> 00:03:48.519 But there are a whole host of things that are either developed or are on the horizon 00:03:48.519 --> 00:03:49.519 that we should be using. 00:03:49.519 --> 00:03:50.519 Slide #4: Ongoing Activities. 00:03:50.519 --> 00:03:51.519 Slide is not shown on video. 00:03:51.519 --> 00:03:54.809 So our ongoing activities, you know we're thinking very carefully about what this data 00:03:54.809 --> 00:03:55.809 means. 00:03:55.809 --> 00:03:59.900 Anything across scales we have to be thinking about some spurious correlations and our data 00:03:59.900 --> 00:04:00.900 quality. 00:04:00.900 --> 00:04:02.920 But we're going to move forward on testing this bugle hypothesis. 00:04:02.920 --> 00:04:07.400 Do these patterns hold up, what are those means and the variability around those means 00:04:07.400 --> 00:04:11.790 and trends tell us about the dissolved organic matter discharge relationship? 00:04:11.790 --> 00:04:17.130 Those outliers, you know the sites that fall off of that trend, if we do see a general 00:04:17.130 --> 00:04:19.389 pattern, those are the places where we need to pay more attention. 00:04:19.389 --> 00:04:23.650 We might find a site like the Colorado River that looks really different, well it's also 00:04:23.650 --> 00:04:25.240 got an off-water reservoir, right? 00:04:25.240 --> 00:04:30.150 We see that in the SUBA relationship, right, it's way on the bottom relative to the other 00:04:30.150 --> 00:04:31.360 sites. 00:04:31.360 --> 00:04:35.139 And that's going to be particularly true for DOM composition, which can change quite a 00:04:35.139 --> 00:04:40.880 bit, so those outliers may be really important data points in our larger data set. 00:04:40.880 --> 00:04:46.220 We're continuing with the trend evaluations and the models, and Jill I put that one in 00:04:46.220 --> 00:04:47.220 for you (refers to slide). 00:04:47.220 --> 00:04:52.659 I think we expect in the ballpark of 4-6 publications in the next year (Jill is in the audience 00:04:52.659 --> 00:04:54.129 and says: "wonderful!") ok, good. 00:04:54.129 --> 00:04:55.599 Slide #5: Acknowledgements and Questions. 00:04:55.599 --> 00:04:59.990 So thanks again, I mean this has been really awesome for me, certainly, and I think the 00:04:59.990 --> 00:05:05.840 rest of our group really, really appreciated the opportunity to do this and have these 00:05:05.840 --> 00:05:06.850 face-to-face meetings. 00:05:06.850 --> 00:05:12.669 And, you know, I guess there's plenty of bad press for public and federal employees, and 00:05:12.669 --> 00:05:17.810 being given an opportunity to be here and do this, despite all of our travel restrictions, 00:05:17.810 --> 00:05:23.160 I think you argued very strongly for that, and thank you for doing that, because it's 00:05:23.160 --> 00:05:25.280 hard to do over the phone. 00:05:25.280 --> 00:05:28.330 So thanks, yeah, we will collectively answer any questions.