Sentences with phrase «additional carbon absorption»

[The conventional reasoning] double counts the carbon absorbed by plants when the bioenergy crops are grown on land already used for crop production or already growing other plants because the bioenergy does not necessarily result in additional carbon absorption.

Not exact matches

Thawing permafrost also delivers organic - rich soils to lake bottoms, where decomposition in the absence of oxygen releases additional methane.116 Extensive wildfires also release carbon that contributes to climate warming.107, 117,118 The capacity of the Yukon River Basin in Alaska and adjacent Canada to store carbon has been substantially weakened since the 1960s by the combination of warming and thawing of permafrost and by increased wildfire.119 Expansion of tall shrubs and trees into tundra makes the surface darker and rougher, increasing absorption of the sun's energy and further contributing to warming.120 This warming is likely stronger than the potential cooling effects of increased carbon dioxide uptake associated with tree and shrub expansion.121 The shorter snow - covered seasons in Alaska further increase energy absorption by the land surface, an effect only slightly offset by the reduced energy absorption of highly reflective post-fire snow - covered landscapes.121 This spectrum of changes in Alaskan and other high - latitude terrestrial ecosystems jeopardizes efforts by society to use ecosystem carbon management to offset fossil fuel emissions.94, 95,96

ANSWER: by «saturation» is usually meant a complete absorption of the radiation of the surface by the carbon dioxide and water vapor of the air: according to Dufresne and Treiner it is saturated and according to Pierrehumbert (Physics Today 2011) it is not; for me 0.8 (W / m ²) / 400 = 0.2 % for a doubling of the CO2 content is» nearly saturated»; 0.8 W / m ² is the additional absorption for 2xCO2 (e.g. per Hansen 1981)

That is, with more carbon dioxide there are additional frequencies along the skirts of the absorption band for which the atmosphere becomes opaque.

Although somewhat of a simplification, since it's strongest infrared absorption bands are already saturated, the greenhouse effect of additional carbon dioxide in the atmosphere is approximately logarithmic.