Dr. Luke Jeffrey

Ancient carbon released through modern rivers A global analysis reveals that most carbon dioxide emitted by rivers derives not from modern plant material, as was thought, but from ancient, buried carbon.

A global analysis reveals that most carbon dioxide emitted by rivers derives not from modern plant material, as was thought, but from ancient, buried carbon

https://go.nature.com/3FQOdls

View from the middle of the New River. The bedrock and sediments are visible through the clear water, and the river is calm enough to reflect the blue sky and clouds on the water surface. There are tree-covered banks and mountains in the background.

View from the middle of the New River in the morning. The river is calm enough to reflect the blue sky and sun on the water surface. There are tree-covered banks and mountains in the background with a little bit of fog in the distance.

View from the middle of the New River below a small shelf rapid with a few waves. The sky is blue with white puffy clouds. There are tree-covered banks and mountains in the background.

View from the middle of the New River looking toward a riverbank with exposed rock cliffs surrounded by green trees. The sky is blue.

Enjoyed being back on the New River in southwest Virginia. First float of the year after full leaf out & first time floating this section (Whitehorne -> Eggleston) after hurricane Helene.

No advert out yet, but I will recruiting a 2yr postdoc, start date autumn 2025, at @livunigeog.bsky.social soon. Lowland and upland peatlands, GHGs, DOM and water chemistry. Plenty of fieldwork. Feel free to drop me a DM or email if you might be interested, and please spread the word.

🌊

Mycorrhizal networks: Understanding hidden complexity Read the free Plain Language Summary for this article on the Journal blog.

It’s alive! Our Mycorrhizal Networks special issue is out in Functional Ecology.
Packed with spore-tacular science.

A collection that highlights advances, identifies unresolved questions & the future research directions.

besjournals.onlinelibrary.wiley.com/doi/10.1111/...

We are seeking a Postdoctoral Researcher (PDRA) in Freshwater Ecosystem Ecology researching the role of organic matter as a nutrient resource in freshwater ecosystems. A 4.5 year role with great training opportunites in isotope ecology and mesocosm experimental science www.jobs.ac.uk/job/DLU610/p...

There's a postdoc in peatland biogeochemistry advertised on our project by Dolly Kothawala and Gustaf Granath
at Uppsala University. I can highly recommend Uppsala as a place to live and work.

www.uu.se/en/about-uu/...

New paper! led by Josh Dean “Old carbon routed from land to the atmosphere by global river systems”
doi.org/10.1038/s415...

#radiocarbon in #rivers reveals the age of CO2 they release to the atmosphere.

An active leak of old carbon from land.
🧪⚒️
@joshfdean.bsky.social @oxuniearthsci.bsky.social

Mapping the world's inland surface waters: an upgrade to the Global Lakes and Wetlands Database (GLWD v2) Abstract. In recognition of the importance of inland waters, numerous datasets mapping their extents, types, or changes have been created using sources ranging from historical wetland maps to real-tim...

A fantastic new mapping product for the world's inland waters, a critical driver for studying GHG emissions, biodiversity, and much more.

Mapping the world's inland surface waters: an upgrade to the Global Lakes and Wetlands Database (GLWD v2)

essd.copernicus.org/articles/17/...

One way to collect 500 mL of #methane ebullition from a #GhostForest in 8 m of standing water…

What a way to start the (sampling) day 👌 with @jodittmann.bsky.social

Top winters day back at the Ghost Forest sampling for @jodittmann.bsky.social PhD projects. Plenty of ebullition bubbles down there!!

Back in the Ghost Forest, looking #GHG from dead trees with @jeffrethane.bsky.social

Looks like an amazing field trip for your undergrads Jackie!

Last week I had the pleasure of hosting our @soaes-unisq.bsky.social undergrad students studying Water Science during the WAT1101 residential school. In true Toowoomba style, the students had the full immersion experience, with consistent rain during the entire 3 days of our field tour.

Reducing air pollution could increase methane emissions from wetlands – here’s what needs to be done Improved computer models shed light on how reducing sulphur emissions will inadvertently release methane from wetlands.

Here’s our The Conversation piece about the research.

What if plants could pick their own fungal protectors?! ⚔️🌱

We're looking for a PhD student for a unique dual award PhD. Based at Western Sydney Uni & spend 12-18 months at University of Sheffield.

You will work with me and with Profs Katie Field, Scott Johnson, Jeff Powell, and Jurriaan Tonn.

🌿 Pristine mangroves absorb nitrous oxide (N2O), offsetting up to 71% of methane (CH4) emissions.

🌎 Global N2O uptake may compensate one-third of aquatic CH4 emissions.

aslopubs.onlinelibrary.wiley.com/doi/full/10....

@aslo.org @barefootlab.bsky.social @biogeoste.bsky.social

#ASLO_Letters

Investigating the accuracy of tropical woody stem CO2 efflux estimates: scaling methods, and vertical and diel variation Stem CO2 efflux (EA) significantly contributes to autotrophic and ecosystem respiration in tropical forests, but field methodologies often introduce biases and uncertainty. This study evaluates thes...

Our new paper is out today @newphyt.bsky.social We investigated the bias involved in woody stem CO2 efflux measurements in tropical forests - including diel and vertical variations, and used TLS to upscale vertical variations and estimate stem surface area nph.onlinelibrary.wiley.com/doi/10.1111/...

Combined CH4, N2O, and CO2 Fluxes Reveal a Net Carbon Sink Across a Glacier‐Ocean Continuum A rapidly-retreating marine-terminating glacier exported CH4 to nearshore waters N2O was undersaturated near the glacier front The regional CO2 sink greatly outweighs CH4 and N2O emissions

My last PhD chapter is out!

Combined GHG fluxes reveal a net carbon sink across a glacier-ocean continuum — glacier exports CH₄ to coastal waters, but strong CO₂ uptake outweighs GHG emissions. 🌊❄️

Read more: agupubs.onlinelibrary.wiley.com/doi/full/10....

Looks awesome, wish I was there and hope it all went well!

And that’s a wrap! Huge effort from #SCU team working in the hot and humid tropical #wetland and #Savannah #forests in the Northern Territory. Many thanks to #CDU colleagues for incredible support and assistance 🙌 Now it’s time for GHG data analysis…

Photo dump from amazing field sites in Australia’s Northern Territory. Our #PhD students are collecting data to better understand #carbon, #nutrient and green house gas fluxes in #tropical wetland and upland forests.🌳

Our terrestrial #biogeochemistry research team in action yesterday investigating #GHG, #nutrient and #carbon fluxes in tropical wetland forests in the Northern Territory. #treethane