【温室气体排放】Suzanne B. Hodgkins^a1 Malak M. Tfaily^a Carmody K. McCalley^b Tyler A. Logan^c Patrick M. Crill^d Scott R. Saleska^b Virginia I. Rich^e and Jeffrey P. Chanton^a1. Changes in peat chemistry associated with permafrost thaw increase greenhouse gas production. PNAS 2014 vol. 111 no. 16   5819–5824 doi: 10.1073-pnas.1314641111

Abstract

Carbon release due to permafrost thaw represents a potentially major positive climate change feedback. The magnitude of carbon loss and the proportion lost as methane (CH₄) vs. carbon dioxide (CO₂) depend on factors including temperature mobilization of previously frozen carbon hydrology and changes in organic matter chemistry associated with environmental responses to thaw. While the first three of these effects are relatively well understood the effect of organic matter chemistry remains largely unstudied. To address this gap we examined the biogeochemistry of