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

. The Arctic is exposed to even faster temperature changes than most otherareas on Earth. Constantly increasing temperature will lead to thawingpermafrost and changes in the methane (CH4) emissions from wetlands.One of the places exposed to those changes is the Abisko–Stordalen Mire innorthern Sweden, where climate and vegetation studies have been conductedsince the 1970s. In our study, we analyzed field-scale methane emissions measured by the eddycovariance method at Abisko–Stordalen Mire for 3 years (2014–2016). Thesite is a subarctic mire mosaic of palsas, thawing palsas, fully thawedfens, and open water bodies. A bimodal wind pattern prevalent at the siteprovides an ideal opportunity to measure mire patches with differentpermafrost status with one flux measurement system. The flux footprint for westerly winds was dominated by elevated palsa plateaus, while the footprint was almost equally distributed between palsas and thawing bog-like areas foreasterly winds. As these patches are exposed to the same climatic andweather conditions, we analyzed the differences in the responses of theirmethane emission for environmental parameters. The methane fluxes followed a similar annual cycle over the 3 studyyears, with a gentle rise during spring and a decrease during autumn,without emission bursts at either end of the ice-free season. The peak emission during the ice-free season differed significantly for the two mire areas with different permafrost status: the palsa mire emitted 19 mg-C m−2 d−1 and the thawing wet sector 40 mg-C m−2 d−1. Factors controlling the methane emission wereanalyzed using generalized linear models. The main driver for methane fluxeswas peat temperature for both wind sectors. Soil water content above thewater table emerged as an explanatory variable for the 3 years forwestern sectors and the year 2016 in the eastern sector. The water tablelevel showed a significant correlation with methane emission for the year2016 as well. Gross primary production, however, did not show a significantcorrelation with methane emissions. Annual methane emissions were estimated based on four different gap-filingmethods. The different methods generally resulted in very similar annualemissions. The mean annual emission based on all models was 3.1 ± 0.3 g-C m−2 a−1 for the western sector and 5.5 ± 0.5 g-C m−2 a−1 for the eastern sector. The average annual emissions,derived from these data and a footprint climatology, were 2.7 ± 0.5 and 8.2 ± 1.5 g-C m−2 a−1 for thepalsa and thawing surfaces, respectively. Winter fluxes were relativelyhigh, contributing 27 %–45 % to the annual emissions.

Field-scale CH&lt;sub&gt;4&lt;/sub&gt; emission at a subarctic mire with heterogeneous permafrost thaw status

Field-scale CH<sub>4</sub> emission at a subarctic mire with heterogeneous permafrost thaw status