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Methane emission bursts from permafrost environments during autumn freeze-in: New insights from ground-penetrating radar

In English

Författare

Summary, in English

Large amounts of methane (CH4) are known to be emitted from permafrost environments during the autumn freeze-in, but the specific soil conditions leading up to these bursts are unclear. Therefore, we used an ultrawide band ground-penetrating radar in Northeast Greenland in autumn 2009 to estimate the volumetric composition inside the soil through dielectric characterization from 200 to 3200 MHz. Our results suggest a compression of the gas reservoir during the phase transition of soil water, which is accompanied by a peak in surface CH4 emissions. About 1 week thereafter, there seems to be a decompression event, consistent with ground cracking which allows the gas reservoir to expand again. This coincides with the largest CH4 emission, exceeding the summer maximum by a factor of 4. We argue that these complementary measurement techniques are needed to come to an understanding of tundra CH4 bursts connected to soil freezing.

Publiceringsår

2015

Språk

Engelska

Sidor

6732-6738

Publikation/Tidskrift/Serie

Geophysical Research Letters

Volym

42

Issue

16

Dokumenttyp

Artikel i tidskrift

Förlag

American Geophysical Union (AGU)

Ämne

  • Geosciences, Multidisciplinary
  • Electrical Engineering, Electronic Engineering, Information Engineering

Nyckelord

  • ground-penetrating radar
  • Greenland
  • autumn freeze-in
  • methane
  • frequency domain

Status

Published

Forskningsgrupp

  • Neuronano Research Center (NRC)

ISBN/ISSN/Övrigt

  • ISSN: 1944-8007