 Hi everybody. So this is the model that we're going to use in the first part of the lab And I want you to really familiarize yourself with the controls before you really get started Okay, I think it's really important And it can be a lot of fun to experiment with this and really get used to to playing with it before you start The lab and I think if you do that then the lab will be very straightforward So basically what we have here is a carbon cycle very complicated This is the stellar version of the carbon cycle here and you can basically see all the all the knobs and bells and whistles with these stellar connections And over on this side is the ocean model that we already used in module three lab So you really don't need to understand this of course, but it it shows you how complicated it is and we'll see later on why it's such such a good model Okay, so the the bottom line is we have three different emission scenarios that are controlled down here by these switches Okay, we have a business as usual switch Which is basically the worst case scenario scenario emission scenario a2 and you can see that is here It goes all the way up and actually then it drops off But still it goes all the way up through 2100 we continue fossil fuel burning through 2100 without stopping Okay, that's this switch So that's with this on and you can read about this down here So if I turn this switch off and I leave this switch off and I'll explain this switch in a minute Then what we do is we level off Fossil fuel burning around 2010 we just level it off Okay, which obviously didn't happen because we've gone through 2010 But it just shows you what happens if we slow down fossil fuel burning don't completely stop it Okay, and then the third switch is what we what we do is if we all of a sudden drastically stop fossil fuel burning FFP holds and what that shows is around 20 2010 we stop see if I can move this up But anyway, it's down here. You you can see we stop fossil fuel burning at 2010 it goes down to zero Okay, so that's basically what you what happens with that third switch So the three switches are three scenarios are business as usual with this switch on this switch off Both switches off is leveling off at 2010 and Then with this switch on we halt Fossil fuel burning at 2010. Okay, don't worry about the land use switch for this part of the lab All right now the critical thing is we can run. Let's run business as usual I want to show you one other thing You run this model here and let's say you want to then run another model Let's say we'll turn it off and run the second one You can see these two curves side by side so you can see business as usual and then you can see the leveling off of Fossil fuel burning and then if you want to run the third one But excuse me. Sorry about that. We're just going to turn this on and then you see you see the third switch The third scenario here three So one Business as usual to leveling off three fossil fuel burning But what I wanted to show you also is that if you want to then start over again and do something different You restore everything. Okay in general It's a good idea between experiments to restore everything to get everything back to back to usual back to normal And then one other one other tip that I just thought about is if for some reason the model isn't working for you And you aren't using Google Google Chrome switch to Chrome because it's the most stable It's the most stable browser for style models All right, so let me show you the output that we can get so let's have business as usual This is global temperature change and as I said the emissions the fossil fuel burning stops at 2150 or so And so you'll see this temperature decrease, which isn't really important for the lab CO2 you can see it rises steadily here and then drops here pH Goes down and then rises a little bit but you can see it's going down This is ocean pH and then one other thing I wanted to show you is make sure you can read the values here So I'm gonna click on the curve and you can see it running along the curve It shows you the values down the bottom run one 8.14 987 and then moving down the curve you can see the values you can see both the year and the value so now I'm 2040 and I'm now at 2083 my value is seven point eight four four and now I'm down at 2040 Excuse me 2153 at the bottom and my value is seven point five five Okay, so make sure that you can run the the cursor Along the curve and read the values not only the year, but the values of pH temperatures CO2 Etc all of these different curves you can do this which is really really helpful and very important for the lab All right, so then we also have How much of this CO2 is absorbed by the air how much is absorbed by the ocean? How much is absorbed by the biosphere in the the purple curve number three? Moving along page five shows you fossil fuel burning which shuts off as I said earlier by 2050 or so This is both CO2 and fossil fuel burning fossil fuel burning in red CO2 atmospheric CO2 total in Blue Comparing those two curves this here shows you what happens in the biosphere. It's the atmosphere in one The land biota in two how much CO2 is absorbed by land how much is absorbed by soil? How much is absorbed by permafrost and? Then this here shows how much is absorbed by surface ocean and deep ocean This here shows you the Gigatons of carbon from fossil fuel burning And then finally comparison of the modeling observations. So this shows you in in blue the Model run. This is the model run that we have established with this carbon cycle and in red We show the observed Atmospheric CO2 this is measured in the atmosphere through 2010 and you can see how close they are together It shows that this model works really well All right, so that's a good summary of what this model does This is for the first part of the lab step one and I will be producing another video for step two