Earlier snowmelt reduces atmospheric carbon uptake in midlatitude subalpine forests

Previous work demonstrates conflicting evidence regarding the influence of snowmelt timing on forest net ecosystem exchange (NEE). Based on 15 years of eddy covariance measurements in Colorado, years with earlier snowmelt exhibited less net carbon uptake during the snow ablation period, which is a p...

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Vydané v:	Geophysical research letters Ročník 43; číslo 15; s. 8160 - 8168
Hlavní autori:	Winchell, Taylor S., Barnard, David M., Monson, Russell K., Burns, Sean P., Molotch, Noah P.
Médium:	Journal Article
Jazyk:	English
Vydavateľské údaje:	Washington John Wiley & Sons, Inc 16.08.2016 Wiley
Predmet:	Ablation air Air temperature Alignment Atmospheric temperature Carbon Carbon uptake Climate Climate change Colorado Covariance Eddy covariance Equivalence Exchanging Forest ecosystems Forests geophysics Global warming latitude Marine net ecosystem exchange Productivity Reduction Regression Snow snow ablation period Snow-water equivalent Snowmelt Temperature Temperature effects Time measurement Uptake Uptakes Vortices Water United States > US Colorado USA, Colorado
ISSN:	0094-8276, 1944-8007
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Shrnutí:	Previous work demonstrates conflicting evidence regarding the influence of snowmelt timing on forest net ecosystem exchange (NEE). Based on 15 years of eddy covariance measurements in Colorado, years with earlier snowmelt exhibited less net carbon uptake during the snow ablation period, which is a period of high potential for productivity. Earlier snowmelt aligned with colder periods of the seasonal air temperature cycle relative to later snowmelt. We found that the colder ablation‐period air temperatures during these early snowmelt years lead to reduced rates of daily NEE. Hence, earlier snowmelt associated with climate warming, counterintuitively, leads to colder atmospheric temperatures during the snow ablation period and concomitantly reduced rates of net carbon uptake. Using a multilinear‐regression (R2 = 0.79, P < 0.001) relating snow ablation period mean air temperature and peak snow water equivalent (SWE) to ablation‐period NEE, we predict that earlier snowmelt and decreased SWE may cause a 45% reduction in midcentury ablation‐period net carbon uptake. Key Points Earlier snowmelt aligns with colder periods of the seasonal air temperature cycle Lower air temperatures reduce net carbon uptake during the annual snow ablation period Under a warming scenario we expect decreased carbon uptake during the annual snow ablation period
Bibliografia:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 content type line 23
ISSN:	0094-8276 1944-8007
DOI:	10.1002/2016GL069769