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Anna Virkkala

@annvirkk.bsky.social

Research scientist @Woodwell Climate Research Center and @University of Helsinki. Arctic, carbon, climate change.

9 Posts182 Follower94 Folgt
Anna Virkkala@annvirkk.bsky.social · 10mo ago

It has taken more than two years (plus all the years data contributors have spent on their data collection), but finally our data descriptor manuscript preprint on Arctic-boreal carbon fluxes across terrestrial and freshwater ecosystems is out: essd.copernicus.org/preprints/es... Go have a look!

ABCFlux v2: Arctic–boreal CO2 and CH4 monthly flux observations and ancillary information across terrestrial and freshwater ecosystems

Abstract. Measurements of surface-atmosphere carbon dioxide (CO2) and methane (CH4) fluxes have been relatively sparse across the Arctic tundra and boreal biomes, causing significant uncertainties in ...

essd.copernicus.org

Dr. Merritt Rae Turetsky@queenofpeat.bsky.social · last yr.

Hot off the presses! Abrupt permafrost thaw is a critical climate feedback but is poorly defined & understood. In an awesome collaboration between my team & the Permafrost Carbon Network, PhD student Hailey Webb provides a formal definition to guide future studies. link.springer.com/article/10.1...

A Review of Abrupt Permafrost Thaw: Definitions, Usage, and a Proposed Conceptual Framework - Current Climate Change Reports

Purpose of Review We review how ‘abrupt thaw’ has been used in published studies, compare these definitions to abrupt processes in other Earth science disciplines, and provide a definitive framework f...

link.springer.com

Permafrost Pathways@permafrostpathways.bsky.social · last yr.

Congratulations to Dr. Ying and all co-authors, including @benpoulter.bsky.social @profdesai.bsky.social and @woodwellclimate.bsky.social @permafrostpathways.bsky.social's Jennifer Watts, Kyle Arndt, @annvirkk.bsky.social, Brendan Rogers, and Sue Natali. essd.copernicus.org/articles/17/...

WetCH4: a machine-learning-based upscaling of methane fluxes of northern wetlands during 2016–2022

Abstract. Wetlands are the largest natural source of methane (CH4) emissions globally. Northern wetlands (>45° N), accounting for 42 % of global wetland area, are increasingly vulnerable to carbon los...

essd.copernicus.org

Anna Virkkala@annvirkk.bsky.social · last yr.

If you need land cover datasets for the Arctic-boreal region, here is one great option for you at 1-km resolution: essd.copernicus.org/preprints/es.... It merges several regional products and separates dozens of key land cover types (e.g. bogs, fens, pine forest, spruce forest). 🌎🏞🏔

Fusing Regional and Global Datasets to Develop a Composite Land Cover Product Across High Latitudes

Abstract. Rapid warming across the Arctic is the primary driver of widespread permafrost thaw, with far-reaching consequences for local ecosystem resilience, the regional carbon budget, and the global...

essd.copernicus.org

Anna Virkkala@annvirkk.bsky.social · last yr.

First circumpolar maps of aboveground tundra biomass at 30 m resolution 💪 www.sciencedirect.com/science/arti... These new estimates show that in total tundra plants (above-and belowground) store around 8 Pg C while the upper 30 cm soils store ca 53 Pg C.

Next generation Arctic vegetation maps: Aboveground plant biomass and woody dominance mapped at 30 m resolution across the tundra biome

The Arctic is warming faster than anywhere else on Earth, placing tundra ecosystems at the forefront of global climate change. Plant biomass is a fund…

sciencedirect.com

Permafrost Pathways@permafrostpathways.bsky.social · 2y ago

We are so grateful for everyone's engagement and great questions on this study! We want to address a few of the main ones that have appeared 🧵

Permafrost Pathways@permafrostpathways.bsky.social · 2y ago

🧊🔥 New paper @natclimchange.bsky.social: After millennia as a carbon deep-freezer for the planet, a third of the Arctic-boreal zone is now a CO2 source to the atmosphere. The int’l research team was led by @annvirkk.bsky.social ⬇️ Learn more: permafrost.woodwellclimate.org/after-millen...

Anna Virkkala@annvirkk.bsky.social · 2y ago

Last week's highlight was our study in @natclimchange.bsky.social showing over 30% of the Arctic-boreal region as a CO2 source: www.nature.com/articles/s41...

Wildfires offset the increasing but spatially heterogeneous Arctic–boreal CO2 uptake - Nature Climate Change

How the carbon stocks of the Arctic–Boreal Zone change with warming is not well understood. Here the authors show that wildfires and large regional differences in net carbon fluxes offset the overall ...

nature.com

Anna Virkkala@annvirkk.bsky.social · 2y ago

First PhD paper (preprint) from a collaborator Nathalie Triches on some methodological tips related to Arctic N2O flux measurements: amt.copernicus.org/preprints/am... 🧐🏔🛢

Advancing N2O flux chamber measurement techniques in nutrient-poor ecosystems

Abstract. Nitrous oxide (N2O) is the third most important greenhouse gas, with its atmospheric concentration rising from 273 parts per billion (ppb) to 336 ppb since 1800, primarily due to agricultura...

amt.copernicus.org

Robert G. Björk@robertgbjork.bsky.social · 2y ago

📢New paper🚨Excited to share our new review paper in @plosclimate.org on Browning events in Arctic ecosystems! 🌿❄️ A wonderful collaboration, brilliantly led by @garethphoenix.bsky.social. 🌿@naturvetenskap.bsky.social @vetenskapsradet.bsky.social

PLOS Climate@plosclimate.org · 2y ago

A new PLOS Climate Review article by @garethphoenix.bsky.social and colleagues brings together understanding of browning events in Arctic ecosystems to compare their impacts and rates of recovery, and likely future changes in frequency and distribution journals.plos.org/climate/arti...