Okay. So today we will be talking about why the different levels or concentrations of gas is at, you know, different desk depths in the ocean. Okay, so particularly the two gas is of concern are oxygen 02 and carbon dioxide co two. Okay, so a Z could tell I made a graph. Hi. I like to do visual type of learning s. Oh, here we go. So, at the top of this graph, I made a blue line representing the surface of the ocean. Okay. And at the surface of the ocean was look at co two levels and how they change as we go down deeper into the ocean. So starting off at the surface, co two levels are at its lowest. If we go down to the bread axes, which is also for co two is for the scales for co two, um, co two starts out at its lowest, which is 90 parts per million. Okay, um, so let's go back up to the surface and let's scuba dive down down deeper into the ocean. We come around here to back to the red access and it is around, I don't know, maybe 108 parts per million. And so, from surface to, you know, deeper into the ocean, the concentration of seal to goes up. Okay, so I like to write things out. As you know, you go down as you go down into the ocean. So down into the ocean, scuba diving. Okay. What happens? Like we just said for co two, what happens is that co two concentrations go up, and we will explain why that iss I just wanted to How kind of guide. Everybody, um you know how to read the graph and all that start to finish type of thing. Okay. Now we need to look at oxygen levels oxygen starting at the surface of the ocean at the blue line, where it's a 0 m death, we look, and at the surface, oxidants starts at a 7.5 parts per million. And as we scuba dive down into deeper parts of the ocean, oxygen is now at a 1.5 parts per million, which means from surface to deeper ocean, we go from 7.5 to 1.5. Which means that oxygen concentrations as we descend deeper into the ocean Well, uh, oxygen levels decrease. So as you go deeper into the ocean, we lose oxygen. Oxygen is not as prevalent as the surface. Okay? Why is that? So now we're explained. Why not that we see the trend. Now we're gonna explain. Well, why is that? What's going on in the ocean that is causing this, you know, changing concentrations of gas. Okay, so at thes sunlit layer, which I'm going to write as s for sun l for lit l for layer, sunlit layer so sunlit layer I have denoted with the dash line. Okay, this is the sunlit layer. And in the sunlit layer is where the's beams of rays of sun What the's black squiggly marks indicate sun comes down into the ocean. You know, these beams of sun traveled, you know, through the water and in the sunlit layer of the ocean. You know, we have phytoplankton. We have like seaweed, and we have photosynthetic plants and organisms. So in the sunlit layer, with all these photos with photosynthesis occurring in with these photosynthetic organisms, we have photosynthesis occurring like I just said, eso photosynthesis consists of what? Well, if you remember to do photosynthesis carbon dioxide is needed. Um, plus plus what? We just said it the sun. Okay. They need that lights and which will in turn turn into oxygen. They produce oxygen and all the oxygen being produced. Kids put into the water because the plants don't want it, they don't need it. So the water, the water's oxygen concentration goes up and the waters carbon dioxide concentration will go down because the plants are taking it in and the phytoplankton are taking it in, taking it out of the water into their cells, coupled with some sunlight. Okay, and they produce oxygen, says I don't want it. Here you go. Now it's in the water, which is great. It's great for other living organisms. Okay, so that's why that's why at the surface of the ocean in the sun, like I said in the sunlit layer, CO two is gonna be less. It's it's getting used up. 02 is going to be at its most. As you could see, the graph 02 is at its most okay. C 02 is at its least all right because of the photosynthetic organisms now passed the sunlit layer on what's going to call this deep deeper than the sunlit layer you can see in the graph that they start to the two lines. We'll start to go towards one another and crisscross and then go into the opposite direction of what they started. So oh, two starts high, crisscross. Now it's low co two starts high, crisscross. Uh, And when co two starts Lowe. Sorry. So to start slow at 90 Crisscross and higher than when it started. All right, why is that? Well, when we don't have photosynthesis going on because we're no longer in the sunlit layer. Um, other organisms that don't do photosynthesis. Rather they do aerobic respiration. They What do they do? Well, they will take like us. They will take oxygen. Okay. Like oxygen, fish. How? User Gilles To obtain oxygen. Okay, Plus well, we don't use sun. Those organisms don't use son, but they do You They do need some type of food. That's their energy source, some type of food. Whatever that food is, they will couple. It's with some oxygen. And what do they produce as a waste product? Well, you guessed it. It iss seek out to carbon dioxide. They don't want that stuff just like we don't want that stuff in our bodies. So they spit it out into the water. Great. So since these organisms that are not photosynthetic at all, they take whatever oxygen is in the ocean, they take it out of the water into their bodies. So that's why oxygen is going down as we go deeper past that sunlit layer. Okay? And as a result, after eating so food, all that good stuff, now they're saying, I don't want this co two. It's not good for my body. I'm gonna spit it out into the water that is aerobic respiration. So that's why CO two increases because, you know, you have more sea life that does aerobic respiration, more organisms that air spitting out the CO two. I don't want it. It's not good for me. Here you go. I'll take that oxygen, though, So that's why oxygen gal's oxygen concentration of the ocean will go to, um, because all the organisms past the sunlit layer they're using at all. So oxygen starts high, go deeper. Many, many organisms, many money organisms using it, using it, using it, it goes, it just keeps dropping. With the co two uh, there's no photosynthetic organisms past the sunlight layer. So many organisms air saying as they're using up all this 02 the spitting out CO two, spitting it out, spitting it out, spinning out. No photosynthetic organisms, removing it from the water so it just accumulates more and more organism. Spit it out. They don't need it more and more organisms spit it out. One more organisms e use of oxygen, More organisms Spit out that co two and so increases as you go deeper into the ocean. All right, I hope that was good enough and not too long.