Are the atmospheric carbon dioxide concentrations measured at Mauna Lo lowest during summer?

Answer 1

Yes, the minimum levels in CO2 concentrations correspond to the Northern Hemisphere's summer; this is because the Northern Hemisphere holds the majority of the world's vegetation. So before the summer, in the spring, there is much new growth in the Northern Hemisphere, which takes CO2 out of the atmosphere; when fall begins, vegetation becomes dormant. Other man-made processes continue to release CO2 into the atmosphere, so levels of carbon dioxide in the atmosphere are at a maximum level at the end of the Winter.

Answer 2

No, atmospheric carbon dioxide concentrations are typically highest in the summer due to increased plant photosynthesis during this season. Winter months tend to have lower concentrations as plants go dormant and release less carbon dioxide.