Methane diffusive fluxes from subarctic lakes on the Stordalen Mire, Abisko, Northern Sweden

Joachim Jansen, Martin Wik, Jo Snöälv, Patrick Crill

This dataset provides measurements of the diffusive flux of methane (CH₄), a strong climate forcing trace gas, to the atmosphere from three subarctic lakes located on the Stordalen Mire in northern Sweden.

We measured turbulence-driven diffusive fluxes of CH₄ with floating chambers during the ice-free seasons of 2010 to 2017, approximately every 1⁠ – ⁠2 weeks, from different locations in the lakes. The lakes are small (surface area 0.010⁠ – ⁠0.17 km²) and shallow (max. depth 1.3⁠ – ⁠6.7 m), and are structural features of the landscape (i.e. non-thermokarst). The chambers were deployed for 24 hours to integrate diel changes in the surface concentration and gas transfer velocity, during which the chamber headspace was sampled 2⁠ – ⁠4 times. Gas concentrations were measured on a gas chromatograph. A flux was computed from the rate increase of CH₄ in the chamber headspace. Paired measurements of key environmental variables (temperature and wind speed) are also provided. This is a unique dataset in both its spatiotemporal resolution and length.

The measurements have been used to assess the environmental drivers of CH₄ emissions from lakes to the atmosphere, and how emissions might change under continued Arctic warming.

Citation

Joachim Jansen, Martin Wik, Jo Snöälv, Patrick Crill (2020) Methane diffusive fluxes from subarctic lakes on the Stordalen Mire, Abisko, Northern Sweden. Dataset version 1. Bolin Centre Database. https://doi.org/10.17043/stordalen-lakes-ch4-diff-1

References

Jansen J, Thornton BF, Cortés A, Snöälv J, Wik M, MacIntyre S, Crill PM. (2020). Drivers of diffusive CH₄ emissions from shallow subarctic lakes on daily to multi-year timescales. Biogeosciences, 17, 1911⁠ – ⁠1932. https://doi.org/10.5194/bg-17-1911-2020

Data description

This dataset consists of one .csv file (data), one .png file (map of the sampling locations) and one .rtf file (readme).

The csv file has eight data columns:

• Lake
• Depth zone
• Day of year (DOY)
• Sampling date and time (UTC+2)
• Flux (mg CH₄/m²/day)
• Surface sediment temperature (°C)
• Surface water temperature (°C)
• Wind speed at 10 m (m/s)

Comments

Please, cite both the dataset itself and the publication by Jansen et al. (2020) when using this dataset. The principal investigators (Joachim Jansen and Patrick Crill) would also welcome to receive a notification when the data are used in any publication or derivative work.

Alternative contact person: [javascript protected email address], Department of Geological Sciences, Stockholm University.