Reviews and syntheses: Changing ecosystem influences on soil thermal regimes in northern high-latitude permafrost regions

Loranty, Michael M.; Abbott, Benjamin W.; Blok, Daan; Douglas, Thomas A.; Epstein, Howard E.; Forbes, Bruce C.; Jones, Benjamin M.; Kholodov, Alexander L.; Kropp, Heather; Malhotra, Avni; Mamet, Steven D.; Myers-Smith, Isla H.; Natali, Susan M.; O&apos;Donnell, Jonathan A.; Phoenix, Gareth K.; Rocha, Adrian V.; Sonnentag, Oliver; Tape, Ken D.; Walker, Donald A.

doi:10.5194/bg-2018-201

Title: Reviews and syntheses: Changing ecosystem influences on soil thermal regimes in northern high-latitude permafrost regions

Journal Article · Mon May 07 00:00:00 EDT 2018 · Biogeosciences Discussions (Online)

DOI:https://doi.org/10.5194/bg-2018-201· OSTI ID:1465025

; Abbott, Benjamin W.; Blok, Daan; Douglas, Thomas A.; Epstein, Howard E.; Forbes, Bruce C.; Jones, Benjamin M.; Kholodov, Alexander L.; Kropp, Heather; Malhotra, Avni;

; Myers-Smith, Isla H.; Natali, Susan M.; O'Donnell, Jonathan A.; Phoenix, Gareth K.; Rocha, Adrian V.; Sonnentag, Oliver; Tape, Ken D.; Walker, Donald A.

Abstract. Permafrost soils in arctic and boreal ecosystems store twice the amount of current atmospheric carbon that may be mobilized and released to the atmosphere as greenhouse gases when soils thaw under a warming climate. This permafrost carbon climate feedback is among the most globally important terrestrial biosphere feedbacks to climate warming, yet its magnitude remains highly uncertain. This uncertainty lies in predicting the rates and spatial extent of permafrost thaw and subsequent carbon cycle processes. Terrestrial ecosystem influences on surface energy partitioning exert strong control on permafrost soil thermal dynamics and are critical for understanding permafrost soil responses to climate change and disturbance. Here we review how arctic and boreal ecosystem processes influence permafrost soils and characterize key ecosystem changes that regulate permafrost responses to climate. While many of the ecosystem characteristics and processes affecting soil thermal dynamics have been examined in isolation, interactions between processes are less well understood. In particular connections between vegetation, soil moisture, and soil thermal properties affecting permafrost conditions could benefit from additional research. In particular, connections between vegetation, soil moisture, and soil thermal properties affecting permafrost could benefit from additional research. Changes in ecosystem distribution and vegetation characteristics will alter spatial patterns of interactions between climate and permafrost. In addition to shrub expansion, other vegetation responses to changes in climate and disturbance regimes will all affect ecosystem surface energy partitioning in ways that are important for permafrost. Lastly, changes in vegetation and ecosystem distribution will lead to regional and global biophysical and biogeochemical climate feedbacks that may compound or offset local impacts on permafrost soils. Consequently, accurate prediction of the permafrost carbon climate feedback will require detailed understanding of changes in terrestrial ecosystem distribution and function and the net effects of multiple feedback processes operating across scales in space and time.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1465025

Journal Information:: Biogeosciences Discussions (Online), Vol. 15, Issue 17; ISSN 1810-6285

Publisher:: European Geosciences UnionCopyright Statement

Country of Publication:: United States

Language:: English

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