Airborne measurements of methane fluxes in permafrost landscapes (AirMeth)


Contact
Jorg.Hartmann [ at ] awi.de

Abstract

One of the most pressing questions with regard to climate feedback processes in a warming Arctic is the regionalscale greenhouse gas release from Arctic permafrost areas. The Airborne Measurements of Methane Fluxes (AIRMETH) campaigns are designed to quantitatively and spatially explicitly address this question. Ground-based eddy covariance (EC) measurements provide continuous in-situ observations of the surface-atmosphere exchange of energy and matter. However, these observations are rare in the Arctic permafrost zone and site selection is bound by logistical constraints among others. Consequently, these observations cover only small areas that are not necessarily representative of the region of interest. Airborne measurements can overcome this limitation by covering distances of hundreds of kilometres over time periods of a few hours. During the AIRMETH-2012 and AIRMETH-2013 campaigns aboard the research aircraft POLAR 5 we measured turbulent exchange fluxes of energy, methane, and (in 2013) carbon dioxide along thousands of kilometres covering the North Slope of Alaska and the Mackenzie Delta, Canada. Time-frequency (wavelet) analysis, footprint modelling, and machine learning techniques are used to extract spatially resolved turbulence statistics and fluxes, spatially resolved contributions of land cover and biophysical surface properties to each flux observation, and regionally valid functional relationships between environmental drivers and observed fluxes that can explain spatial flux patterns and – if available in temporal resolution – allow for spatio-temporal scaling of the observations. This presentation will focus on 2012 methane fluxes on the North Slope of Alaska and the relevant processes on the regional scale.



Item Type
Conference (Talk)
Authors
Divisions
Primary Division
Programs
Primary Topic
Research Networks
Peer revision
Not peer-reviewed
Publication Status
Published
Event Details
International REKLIM Conference, 06 Oct 2014 - 09 Oct 2014, Umweltforum Auferstehungskirche Berlin, Germany.
Eprint ID
39547
Cite as
Sachs, T. , Serafimovich, A. , Metzger, S. , Kohnert, K. and Hartmann, J. (2014): Airborne measurements of methane fluxes in permafrost landscapes (AirMeth) , International REKLIM Conference, Umweltforum Auferstehungskirche Berlin, Germany, 6 October 2014 - 9 October 2014 .


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