Composition and photo-reactivity of organic matter from permafrost soils and surface waters in interior Alaska
K. Gagne, Sara C. Ewers, Carl J. Murphy, R. P. Daanen, Katey Walter Anthony, Jennifer J. Guerard
Abstract
H NMR), absorbance and fluorescence, and photobleaching ability. DOM isolated from winter and summer seasons revealed differing composition and photoreactivity, suggesting varied active layer and permafrost influence under differing ground water flow regimes. Water extractable organic matter isolates from permafrost leachates revealed variation in terms of photoreactivity and photolability, with the youngest sampled permafrost isolate being the most photoreactive and photolabile. As temperatures increase, release of permafrost organic matter is inevitable. Obtaining a holistic understanding of DOM composition and photoreactivity will allow for a better prediction of permafrost thaw impacts in the coming decades.