Frans-Jan Parmentier
Docent
Methane emission bursts from permafrost environments during autumn freeze-in: New insights from ground-penetrating radar
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.
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