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Use of Surface Motion Characteristics Determined by InSAR to Assess Peatland Condition

Alshammari, Lubna; Boyd, Doreen S.; Sowter, Andrew; Marshall, Chris; Andersen, Roxane; Gilbert, Peter; Marsh, Stuart; Large, David J.

Authors

Lubna Alshammari

DOREEN BOYD doreen.boyd@nottingham.ac.uk
Professor of Earth Observation

Andrew Sowter

Chris Marshall

Roxane Andersen

Peter Gilbert

STUART MARSH Stuart.Marsh@nottingham.ac.uk
Professor of Geospatial Engineering

DAVID LARGE David.Large@nottingham.ac.uk
Abbott Professor of Geoscience



Abstract

Peatland surface motion is a key property of peatland that relates to condition. However, field‐based techniques to measure surface motion are not cost‐effective over large areas and long time periods. An alternative method that can quantify peatland surface motion over large areas is interferometric synthetic aperture radar. Although field validation of the accuracy of this method is difficult, the value of InSAR as a means of quantifying peat condition can be tested. To achieve this the characteristics of InSAR time series measured over an18‐month period at 22 peatland sites in the Flow Country northern Scotland were compared to site condition assessment based on plant functional type and site management history. Sites in good condition dominated by Sphagnum display long‐term stability or growth and a seasonal cycle with maximum uplift and subsidence in Aug‐Nov and April‐June respectively. Drier and partially drained sites dominated by shrubs display long‐term subsidence with maximum uplift and subsidence in July‐Oct and Feb‐June respectively. Heavily degraded sites with large bare peat extent display subsidence with no distinct seasonal oscillations. Seasonal oscillation in surface motion at sites with a dominant non‐vascular plant community is interpreted as resulting from changes in seasonal evaporative demand. On sites with extensive vascular plants cover and falling water table, surface oscillations are interpreted as representing sustained drawdown during the growing season and subsequent recharge in late winter. This study highlights the potential to use InSAR to characterize peatland condition and provide a new view of the surface dynamics of peatland landscapes.

Citation

Alshammari, L., Boyd, D. S., Sowter, A., Marshall, C., Andersen, R., Gilbert, P., …Large, D. J. (2020). Use of Surface Motion Characteristics Determined by InSAR to Assess Peatland Condition. Journal of Geophysical Research: Biogeosciences, 125(1), https://doi.org/10.1029/2018JG004953

Journal Article Type Article
Acceptance Date Nov 15, 2019
Online Publication Date Dec 26, 2019
Publication Date 2020-01
Deposit Date Nov 22, 2019
Publicly Available Date Dec 26, 2019
Journal Journal of Geophysical Research: Biogeosciences
Print ISSN 2169-8953
Electronic ISSN 2169-8961
Publisher American Geophysical Union
Peer Reviewed Peer Reviewed
Volume 125
Issue 1
Article Number e2018JG004953
DOI https://doi.org/10.1029/2018JG004953
Public URL https://nottingham-repository.worktribe.com/output/3354487
Publisher URL https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2018JG004953

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Use of Surface Motion Characteristics (32.2 Mb)
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Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/





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