PRA Melting-ICE Project: Svalbard 2022 Expeditions Report

Area of Science:

• Environmental Science
• Microbiology
• Climate Science

Background:

• Arctic regions experience rapid warming, leading to permafrost thaw and organic carbon release.
• Microbial activity in thawing permafrost influences organic matter degradation and greenhouse gas emissions.
• Limited data exists on High Arctic microbial communities during seasonal thaw cycles.

Purpose of the Study:

• Investigate the diversity and activity of active layer microbial communities across a full seasonal thaw cycle in Svalbard.
• Correlate microbial diversity and activity with greenhouse gas fluxes and soil geochemistry.
• Assess the role of microorganisms in the carbon cycle and greenhouse gas release due to permafrost melt.

Main Methods:

• Conducted three expeditions in Svalbard between February and October 2022.
• Selected eight diverse sites for soil sampling and analysis.
• Collected data on soil microbiology, geochemistry, and atmospheric gas fluxes.

Main Results:

• Detailed characterization of microbial communities and their seasonal dynamics in the permafrost active layer.
• Quantification of greenhouse gas fluxes correlated with microbial composition and soil properties.
• Establishment of a baseline for understanding microbial responses to permafrost thaw.

Conclusions:

• Microbial communities in Arctic soils play a crucial role in processing carbon released from thawing permafrost.
• Seasonal thaw significantly influences microbial activity and greenhouse gas production.
• Findings contribute to predicting the impact of permafrost melt on the global carbon cycle and climate change.