 So what we're at here is this is the Duke Hardwood Ameriflux tower. This is part of a network of research sites across the United States that are measuring carbon and water exchange above forest canopies, or above a number of different types of agitated canopies. But this one is looking at a forest. This particular forest is an old hardwood stand, a mixture of deciduous species, mainly oak and hickory with some sweet gum and tulip poplar. It's probably about 80 to 100 years old, the stand of trees, and we're trying to measure a couple of different things here. We're looking at flexes of carbon dioxide starting from the forest floor up through the tree trunks and out to the leaves. We're also looking at the water inputs, including the precipitation that comes in and then water evaporation that leaves again to the forest floor and is transpired through trees. So we have a number of different measurements. Some are located on the ground or at the tree level, so we can then scale those up to the canopy. There's also measurements, equipment that are set up along at the top of the canopy that can then measure the flux of water, the exchange of water vapor and carbon dioxide across the canopy level. So it provides sort of a large-scale footprint of what's happening at the landscape scale. So this tower is 45 meters tall. It needs to be this high so it can extend above the top of the canopy. Most of the trees here are about 35 meters tall, but they extend a little bit higher than that. We want to have the top of the canopy, excuse me, at the top of the tower above the canopy so we can measure the amount of rainfall that's coming in above the canopy as well as the exchange of gases, carbon dioxide gas and water vapor above the entire canopy level. So we'll go up now and have a look. We're up near the top of the Duke Ameriflex tower here. You can see Blackwood Mountain off in the distance there. And this is one of our measurement devices here. This is a sonic anemometer and this is a setup for an eddy flex system. What this can do is measure wind speed and direction at very high resolution, very fine scale, as well as there's a temperature measurement thermocouple down there. This will also measure the concentrations of carbon dioxide and water vapor in the atmosphere at a very high frequency and can compare the wind direction and speed along with the gas concentrations to determine if there's net flux of water vapor and carbon dioxide coming into or going out of the forest canopy. You can see the mixed species across this landscape here. I'm going to zoom in because we can actually see one of the face rings off in the distance there. You can see the towers and supply carbon dioxide throughout the canopy of a La Bollie Plain Forest. It looks a little bit like Stonehenge, but it provides concentration into the center of this ring. You can see the concentration and see if we can see some more of the face rings there.