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Upcoming Seminars
| Title: | Closing the gap on arctic-boreal carbon fluxes
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| Speaker: |
Kyle A. Arndt, Woodwell Climate Research Center
Dr. Arndt studies greenhouse gas and energy fluxes using eddy covariance, primarily working in the arctic-boreal region. He is currently working to expand the eddy covariance flux network across the arctic-boreal region to measure under represented ecosystems to better upscale and model the carbon balance. He received his PhD in ecology from the Joint Doctoral Program in Ecology from San Diego State University and the University of California, Davis where he studied non-growing season carbon fluxes on the North Slope of Alaska.
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| Date/Time: |
Wednesday, March 26, 2025 01:30 PM
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| Location: |
David Skaggs Research Center, Room GC402
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Abstract
The arctic-boreal region is carbon dense, with about one third of global soil carbon stored in permafrost affected soils. As global temperatures rise, the arctic-boreal region is warming at a rate two to four times higher than the global average, making this region particularly vulnerable to rapid changes. It is estimated that by the end of the century, carbon emissions of carbon dioxide and methane from this region will be equal to that of a major industrialized nation, emitting between 30 and 150 billion tons of carbon as permafrost thaws. Despite the potential impacts on global climate, the arctic-boreal region has a relatively sparse monitoring network with only about 20% of the region being represented by monitoring sites for year-round carbon dioxide and methane. As a part of a project called Permafrost Pathways, we aim to fill these data gaps and better constrain and understand carbon fluxes from the arctic-boreal region. We use a statistical approach using a distance measure to find the best locations for new and upgraded eddy covariance tower sites. Thus far, we have installed new sites on the Seward Peninsula in Alaska, in the Hudson Bay Lowlands, and in the Canadian High Arctic. Additionally, we have opportunistically rebuilt a tower (Scotty Creek) that burned down in a fire in 2022 as well to have a rare before and after fire flux record in collaboration with researchers at the Universite de Montreal. We are using these data and more to synthesize flux records across the arctic-boreal region and upscale fluxes of carbon dioxide and methane over time. We find that the boreal region is an increasing carbon dioxide sink with some tundra regions switching to a source over the past two decades. However, when fire is accounted for, the sink is much weaker for the whole region and boreal region is no longer an increasing sink.
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| Title: | (TBD) Aerosol composition and/or the satellite validation of aerosol measurements
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| Speaker: |
Adam Ahern
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| Date/Time: |
Wednesday, April 9, 2025
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| Title: | (TBD) Recent paper on paleo-methane in Nature and current work on methane isotopes
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| Speaker: |
Ben Riddle-Young
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| Date/Time: |
Wednesday, May 14, 2025
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| Title: | (TBD) Observation and modeling of ozone-depleting substances and replacement emissions
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| Speaker: |
Megan Lickley
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| Date/Time: |
Wednesday, June 11, 2025
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| Title: | (TBD) Arctic climate feedback and observations
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| Speaker: |
Jen Kay
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| Date/Time: |
Wednesday, June 25, 2025
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