Just as warm nights make people more active, so too does it for plants. Although plants take up carbon dioxide from the atmosphere, they also internally consume sugars to stay alive. That process, known as respiration, produces carbon dioxide, which plants step up in warm weather, Anderegg said. The researchers found that yearly variations in the carbon sink strongly correlated with variations in plant respiration.
"When you heat up a system, biological processes tend to increase," Anderegg said. "At hotter temperatures, plant respiration rates go up and this is what's happening during hot nights. Plants lose a lot more carbon than they would during cooler nights."

Previous research has shown that nighttime temperatures have risen significantly faster as a result of climate change than daytime temperatures, Anderegg said. This means that in future climate scenarios respiration rates could increase to the point that the land is putting more carbon into the atmosphere than it's taking out of it, "which would be disastrous," he said.

Of course, plants consume carbon dioxide as a part of photosynthesis, during which they convert sunlight into energy. While photosynthesis also is sensitive to rises in temperature, it only happens during the day, whereas respiration occurs at all hours and thus is more sensitive to nighttime warming, Anderegg said.

"Nighttime temperatures have been increasing faster than daytime temperatures and will continue to rise faster," Anderegg said. "This suggests that tropical ecosystems might be more vulnerable to climate change than previously thought, risking crossing the threshold from a carbon sink to a carbon source. But there's certainly potential for plants to acclimate their respiration rates and that's an area that needs future study."

Night temperatures are rising faster than day temperatures which causes plants to emit more carbon dioxide into the air during the night. This is an accelerator effect.

http://phys.org/news/2015-12-nights-atmosphere-carbon-climate.html

BatteriesNotIncluded wrote on Dec 8^th, 2015 at 1:48pm:


Appears that a new minimum for sea ice is portended by year to date chart.

BatteriesNotIncluded wrote on Dec 8^th, 2015 at 1:48pm:


Appears that a new minimum for sea ice is portended by year to date chart.

BatteriesNotIncluded wrote on Dec 8^th, 2015 at 3:46pm:



Yep. Do you have cognitive dissonance? Respiration is CO₂ NOT C.