Indications of Positive Feedback in Climate Change Due to a Reduction in Northern Hemisphere Biomass Uptake of Atmospheric Carbon Dioxide

by Alexander Brown

It is commonly understood that ecosystems have been taking up more carbon dioxide (CO2) as the concentration of atmospheric CO2 increases and the climate changes. The progressive increase in CO2 uptake by terrestrial ecosystems is generally thought to continue until 2030, when the trend is expected to reverse due to ecosystem damage. However, Dr. James C. Curran and Dr. Samuel A. Curran (2016) have found evidence that the trend may have already begun to reverse. They base this on analysis of the atmospheric CO2 measurements taken between 1958 and 2015 from the Mauna Loa observatory in Hawaii, known as the Keeling Curve. These data show a continual rise in atmospheric CO2 levels within a pattern of intra-annual fluctuation. The intra-annual fluctuation consists of decreased atmospheric CO2 levels throughout the summer months (Northern Hemisphere), and increased atmospheric CO2 throughout the rest of the year. Continue reading