@DavidElfstrom @maleve @melanie
That's pretty cool, and something I really didn't know about until I put a weather station with CO2 at our homestead on the edge of the forest and noticed the pattern. We're about ~1/2 mile to the nearest other person, and ~15 miles to the nearest town, which only has ~3,000 people, I believe, and thousands of acres of just forest in all other directions.
I wasn't trying to capture this, so it's probably not ideally located, but, it's on the side of a shed in a valley, with forest completely circling the small meadow it's in.
You can see the daily pattern, and we did hit 751ppm CO2 one night around 3:30AM last week. We aren't there at the moment, either, so this is unmanned CO2 data.
@DavidElfstrom @maleve @melanie
It's an old Netatmo weather station. Probably ca 2015.
When I zoomed in on the data on the 20th, for example, the highs are roughly the same from ~10:45PM until ~7:45 AM(within ~3%). Similarly, the lows are roughly the same from ~12:00 until ~4:00PM.
It is pretty deep in a valley, so often there's no direct sunlight after mid-afternoon, even in the summer, and none at all in the winter.
@BE @maleve @melanie Which monitor is that? You should see CO2 drop at daybreak each day and be at a low in the late afternoon.