Climate Models Fail: Climate Warming Experiment Finds Unexpected Results
Climate models are known to have their shortcomings, whether due to use of faulty theories or shortage of computing skills.
H/T The Global Warming Policy Forum (GWPF)
Tropical forests store about a third of Earth’s carbon and about two-thirds of its above-ground biomass.
Most climate change models predict that as the world warms, all of that biomass will decompose more quickly, which would send a lot more carbon dioxide into the atmosphere.
But new research presented at the American Geophysical Union’s 2018 Fall Meeting contradicts that theory.
Stephanie Roe, an ecology Ph.D. student at the University of Virginia, measured the rate of decomposition in artificially warmed plots of forest in Puerto Rico. She found biomass in the warmed plots broke down more slowly than samples from a control site that wasn’t warmed.
Her results indicate that as the climate warms, forest litter could pile up on the ground, instead of breaking down into the soil. Less decomposition means less carbon dioxide released back into the atmosphere. But it also means less carbon taken up by the soil, where it’s needed to fuel microbial processes that help plants grow.
“These results could have significant implications on the carbon cycle in a warmer future,” Roe said.
Roe said there are few empirical studies of how tropical forests will respond to climate change. She set out to address this gap in June of 2017, when she and her research team travelled to El Yunque National Forest in Puerto Rico. They landed at a site called TRACE—the Tropical Responses to Altered Climate Experiment.
TRACE is the first-ever long-term warming experiment conductedin a tropical forest. It was established by the US Forest Service in 2016 for research like Roe’s. The site consists of three hexagonal plots of land enclosed by a ring of infrared heaters raised four meters above the ground, and three more plots enclosed by fake heaters that are used as the “control” forest.
Roe collected leaves from the plots, dried them out in the lab, and then returned them to the plots randomly. In addition to the native plants, she also included black and green tea, and popsicle sticks to represent woody biomass, to see how different materials would respond to the warming.
The heaters were programmed to continuously heat the plots to four degrees higher than the ambient temperature of the forest. The experiment was supposed to run for a full year, but at the beginning of October, Hurricane Maria swept across the island, destroying the TRACE sites.
Roe was back in Virginia when the storm struck. She had collected samples from the first few months of the experiment, and they were already showing signs of significant decomposition, so she decided to go ahead with the analysis based on what she had.
And the results were not what she thought they would be.
Continued here.
Source: https://tallbloke.wordpress.com/2019/01/05/climate-models-fail-climate-warming-experiment-finds-unexpected-results/
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