Phenological mismatch in coastal western Alaska may increase summer season greenhouse gas uptake

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Video in TIB AV-Portal: Phenological mismatch in coastal western Alaska may increase summer season greenhouse gas uptake

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Phenological mismatch in coastal western Alaska may increase summer season greenhouse gas uptake
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CC Attribution 3.0 Unported:
You are free to use, adapt and copy, distribute and transmit the work or content in adapted or unchanged form for any legal purpose as long as the work is attributed to the author in the manner specified by the author or licensor.
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2018
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English

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Abstract
High latitude ecosystems are prone to phenological mismatches due to climate change- driven advances in the growing season and changing arrival times of migratory herbivores. These changes have the potential to alter biogeochemical cycling and contribute to feedbacks on climate change by altering greenhouse gas (GHG) emissions of carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) through large regions of the Arctic. Yet the effects of phenological mismatches on gas fluxes are currently unexplored. We used a three-year field experiment that altered the start of the growing season and timing of grazing to investigate how phenological mismatch affects GHG exchange. We found early grazing increased mean GHG emission to the atmosphere despite lower CH4 emissions due to grazing-induced changes in vegetation structure that increased uptake of CO2. In contrast, late grazing reduced GHG emissions because greater plant productivity led to an increase in CO2 uptake that overcame the increase in CH4 emission. Timing of grazing was an important control on both CO2 and CH4 emissions, and net GHG exchange was the result of opposing fluxes of CO2 and CH4. N2O played a negligible role in GHG flux. Advancing the growing season had a smaller effect on GHG emissions than changes to timing of grazing in this study. Our results suggest that a phenological mismatch that delays timing of grazing relative to the growing season, a change which is already developing along in western coastal Alaska, will reduce GHG emissions to the atmosphere through increased CO2 uptake despite greater CH4 emissions.

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this paper examines how a few logical mismatch in coastal western Alaska may increase summer season greenhouse gas uptake highlighted the 2 systems play a very important role within our global climate these regions are also experiencing the most rapid changes in response to climate change these changes include an advancement to the start of the growing season and potential changes in the timing of migration of before so use high-latitude regions in the summer months these
changes set up a potential true mismatch this drove mismatches occurring because the timing of maximum vegetation biomass and quality which is historically match the timing of maximum of grazing is becoming divorced from the timing of grazing due to an advancement in the growing season well we know that traffic
mismatch can affect of our populations we don't know how traffic mismatch will affect about you chemical cycling or the exchange of greenhouse gasses between ecosystems in the atmosphere here we investigate the effects of traffic mismatch in coastal western Alaska where there's a developing mismatch between the start of the growing season in the arrival in grazing of Pacific black brant in this study we examine the
questions how is a change in the timing of relative to the growing season greenhouse gas foxes and
what are the controls on carbon dioxide methane and nitrous oxide fluxes in this system Our experimental design included
for timing of grazing treatments crossed with 2 growing
seasons treatments to investigate the study questions we used to field experiment where we manipulated the timing of grazing using captive black brant geese and manipulated the start of the growing season by using open-top chambers which work to passively warm the soil surface during the early part of the growing season Our study demonstrates that mismatches can alter greenhouse gas emissions in the summer breeding area of migratory species specifically we found that functionally will be could be can decrease summer season greenhouse gas emissions primarily through greater C O 2 uptake well in contrast early greasing well to to the growing season results in emissions of both methane and carbon dioxide in all treatments except for early grazing greenhouse gas exchange was determined by opposing forces of carbon dioxide and methane fluxes which acted as the sink and source respectively these results suggest that the developing new logical mismatch in coastal western Alaska in which case are arriving into a morpheme logically advanced system may result in increased greenhouse gas uptake during the summer season in
some of our results suggest that projections of the role of Arctic and sub-Arctic ecosystems in the global climate system should account for climate changes in raising phonology in order to characterize how emissions and the source sink status of these ecosystems will change in your future climate conditions
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