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Dark permafrost peat takes up nitrous oxide

A nutrient-poor Swedish permafrost peatland mostly consumes N2O at night or under a tarp, but emits a little when sunlit.

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Where and along what thaw gradient were fluxes measured?

A thawing subarctic permafrost peatland in northern Sweden, from palsa to bog to fen.

How were light versus dark conditions imposed?

Transparent chambers versus a light-reflective tarp, with paired measurements 10–15 minutes apart.

How large is the dataset?

About 1462 chamber fluxes over seven campaigns in 2022–2024 (snow-free May–September).

What is the overall median flux excluding the hotspot?

−0.38 μg N2O-N m−2 h−1 (n = 1383), a small sink.

What are the light versus dark medians?

Light +0.42 versus dark −1.06 μg N2O-N m−2 h−1.

Is the light–dark difference significant?

Yes: Wilcoxon rank-sum 0.37, p < 0.001 across microhabitats.

How strong is the palsa hotspot?

Median emission 6.08 (2.38, 21.9) μg N2O-N m−2 h−1 (n = 79).

What peatland source median did a recent review report?

2.5 μg N2O-N m−2 h−1, biased toward high-emitting bare palsas.

Why do short 5-minute closures matter?

Long closures deplete headspace N2O and underestimate uptake.

What novel palsa result do they claim?

Persistent net N2O uptake even on dry, uplifted palsa surfaces (except the hotspot).

What GWP and lifetime for N2O are cited?

298 times CO2 over 100 years and a 109-year atmospheric lifetime.