Webbläsaren som du använder stöds inte av denna webbplats. Alla versioner av Internet Explorer stöds inte längre, av oss eller Microsoft (läs mer här: * https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Var god och använd en modern webbläsare för att ta del av denna webbplats, som t.ex. nyaste versioner av Edge, Chrome, Firefox eller Safari osv.

Frans-Jan Parmentier

Frans-Jan Parmentier

Docent

Frans-Jan Parmentier

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

Författare

  • Norbert Pirk
  • Telmo Santos
  • Carl Gustafson
  • Anders J Johansson
  • Fredrik Tufvesson
  • Frans-Jan Parmentier
  • Mikhail Mastepanov
  • Torben Christensen

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.

Avdelning/ar

  • Institutionen för naturgeografi och ekosystemvetenskap
  • Institutionen för elektro- och informationsteknik
  • Neuronano Research Center (NRC)
  • MERGE: ModElling the Regional and Global Earth system
  • BECC: Biodiversity and Ecosystem services in a Changing Climate
  • ELLIIT: the Linköping-Lund initiative on IT and mobile communication

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