Walden Pond, Holocene, Nine Meters discussed on On Point with Tom Ashbrook | Podcasts


Geologic. Periods of time give are given pretty, you know, exciting names, I should say to make it simple. It's an ice age. So the younger dry is to the mid Holocene climactic optimum, which was the thermal maximum paleo limited illogical is the study of past lakes. So we're looking at lake and we're looking at an ice age to a thermal maximum, and what we can see preserved in the mud there. Okay. So you got your hands dirty with this one essentially right looking at sediment from Walden pond. Dating back as you say all the way to the ice age. What did you find? So we took nine meters of core at Walden pond. And we found that different isotopes. So we looked at carbon nitrogen and sulfur. They all have different reactions to temperature. And so if we were looking at the ice age up until our thermal maximum, which is a lot warmer. We can see distinct shifts and what the carbon nitrogen and sulfur are doing. And I'm put it on more simple terms. We're able to relate those three isotopes to things that are commonly happening in a lake setting. So we looked at carbon which we relate to productivity so what are little biological critters doing? How are they eating are they dying? Are they living.

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