English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

. Permafrost peatlands store large amounts of carbon potentially vulnerable todecomposition. However, the fate of that carbon in a changing climate remainsuncertain in models due to complex interactions among hydrological,biogeochemical, microbial, and plant processes. In this study, we estimatedeffects of climate forcing biases present in global climate reanalysisproducts on carbon cycle predictions at a thawing permafrost peatland insubarctic Sweden. The analysis was conducted with a comprehensivebiogeochemical model (ecosys) across a permafrost thaw gradientencompassing intact permafrost palsa with an ice core and a shallow activelayer, partly thawed bog with a deeper active layer and a variable watertable, and fen with a water table close to the surface, each with distinctvegetation and microbiota. Using in situ observations to correctlocal cold and wet biases found in the Global Soil Wetness Project Phase 3(GSWP3) climate reanalysis forcing, we demonstrate good model performance bycomparing predicted and observed carbon dioxide ( CO2 ) and methane( CH4 ) exchanges, thaw depth, and water table depth. The simulationsdriven by the bias-corrected climate suggest that the three peatland typescurrently accumulate carbon from the atmosphere, although the bog and fensites can have annual positive radiative forcing impacts due to their higher CH4 emissions. Our simulations indicate that projected precipitationincreases could accelerate CH4 emissions from the palsa area, evenwithout further degradation of palsa permafrost. The GSWP3 cold and wetbiases for this site significantly alter simulation results and lead toerroneous active layer depth (ALD) and carbon budget estimates. Biases insimulated CO2 and CH4 exchanges from biased climate forcingare as large as those among the thaw stages themselves at a landscape scaleacross the examined permafrost thaw gradient. Future studies should thus notonly focus on changes in carbon budget associated with morphological changesin thawing permafrost, but also recognize the effects of climate forcinguncertainty on carbon cycling.

Large carbon cycle sensitivities to climate across a permafrost thaw gradient in subarctic Sweden