Evaluating temporal controls on greenhouse gas (GHG) fluxes in an Arctic tundra environment: An entropy-based approach.

There is significant spatial and temporal variability associated with greenhouse gas (GHG) fluxes in high-latitude Arctic tundra environments. The objectives of this study are to investigate temporal variability in CO2 and CH4 fluxes at Barrow, AK and to determine the factors causing this variabilit...

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Main Authors: Arora, Bhavna, Wainwright, Haruko M, Dwivedi, Dipankar, Vaughn, Lydia JS, Curtis, John B, Torn, Margaret S, Dafflon, Baptiste, Hubbard, Susan S
Format: Article in Journal/Newspaper
Language:unknown
Published: eScholarship, University of California 2019
Subjects:
Online Access:https://escholarship.org/uc/item/4w411602
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spelling ftcdlib:oai:escholarship.org/ark:/13030/qt4w411602 2023-05-15T14:55:46+02:00 Evaluating temporal controls on greenhouse gas (GHG) fluxes in an Arctic tundra environment: An entropy-based approach. Arora, Bhavna Wainwright, Haruko M Dwivedi, Dipankar Vaughn, Lydia JS Curtis, John B Torn, Margaret S Dafflon, Baptiste Hubbard, Susan S 2019-02-01 application/pdf https://escholarship.org/uc/item/4w411602 unknown eScholarship, University of California qt4w411602 https://escholarship.org/uc/item/4w411602 public CH(4) fluxes CO(2) fluxes Climate change Polygonal tundra CO2 fluxes CH4 fluxes Environmental Sciences article 2019 ftcdlib 2021-11-08T18:16:23Z There is significant spatial and temporal variability associated with greenhouse gas (GHG) fluxes in high-latitude Arctic tundra environments. The objectives of this study are to investigate temporal variability in CO2 and CH4 fluxes at Barrow, AK and to determine the factors causing this variability using a novel entropy-based classification scheme. In particular, we analyzed which geomorphic, soil, vegetation and climatic properties most explained the variability in GHG fluxes (opaque chamber measurements) during the growing season over three successive years. Results indicate that multi-year variability in CO2 fluxes was primarily associated with soil temperature variability as well as vegetation dynamics during the early and late growing season. Temporal variability in CH4 fluxes was primarily associated with changes in vegetation during the growing season and its interactions with primary controls like seasonal thaw. Polygonal ground features, which are common to Arctic regions, also demonstrated significant multi-year variability in GHG fluxes. Our results can be used to prioritize field sampling strategies, with an emphasis on measurements collected at locations and times that explain the most variability in GHG fluxes. For example, we found that sampling primary environmental controls at the centers of high centered polygons in the month of September (when freeze-back period begins) can provide significant constraints on GHG flux variability - a requirement for accurately predicting future changes to GHG fluxes. Overall, entropy results document the impact of changing environmental conditions (e.g., warming, growing season length) on GHG fluxes, thus providing clues concerning the manner in which ecosystem properties may be shifted regionally in a future climate. Article in Journal/Newspaper Arctic Climate change Tundra University of California: eScholarship Arctic
institution Open Polar
collection University of California: eScholarship
op_collection_id ftcdlib
language unknown
topic CH(4) fluxes
CO(2) fluxes
Climate change
Polygonal tundra
CO2 fluxes
CH4 fluxes
Environmental Sciences
spellingShingle CH(4) fluxes
CO(2) fluxes
Climate change
Polygonal tundra
CO2 fluxes
CH4 fluxes
Environmental Sciences
Arora, Bhavna
Wainwright, Haruko M
Dwivedi, Dipankar
Vaughn, Lydia JS
Curtis, John B
Torn, Margaret S
Dafflon, Baptiste
Hubbard, Susan S
Evaluating temporal controls on greenhouse gas (GHG) fluxes in an Arctic tundra environment: An entropy-based approach.
topic_facet CH(4) fluxes
CO(2) fluxes
Climate change
Polygonal tundra
CO2 fluxes
CH4 fluxes
Environmental Sciences
description There is significant spatial and temporal variability associated with greenhouse gas (GHG) fluxes in high-latitude Arctic tundra environments. The objectives of this study are to investigate temporal variability in CO2 and CH4 fluxes at Barrow, AK and to determine the factors causing this variability using a novel entropy-based classification scheme. In particular, we analyzed which geomorphic, soil, vegetation and climatic properties most explained the variability in GHG fluxes (opaque chamber measurements) during the growing season over three successive years. Results indicate that multi-year variability in CO2 fluxes was primarily associated with soil temperature variability as well as vegetation dynamics during the early and late growing season. Temporal variability in CH4 fluxes was primarily associated with changes in vegetation during the growing season and its interactions with primary controls like seasonal thaw. Polygonal ground features, which are common to Arctic regions, also demonstrated significant multi-year variability in GHG fluxes. Our results can be used to prioritize field sampling strategies, with an emphasis on measurements collected at locations and times that explain the most variability in GHG fluxes. For example, we found that sampling primary environmental controls at the centers of high centered polygons in the month of September (when freeze-back period begins) can provide significant constraints on GHG flux variability - a requirement for accurately predicting future changes to GHG fluxes. Overall, entropy results document the impact of changing environmental conditions (e.g., warming, growing season length) on GHG fluxes, thus providing clues concerning the manner in which ecosystem properties may be shifted regionally in a future climate.
format Article in Journal/Newspaper
author Arora, Bhavna
Wainwright, Haruko M
Dwivedi, Dipankar
Vaughn, Lydia JS
Curtis, John B
Torn, Margaret S
Dafflon, Baptiste
Hubbard, Susan S
author_facet Arora, Bhavna
Wainwright, Haruko M
Dwivedi, Dipankar
Vaughn, Lydia JS
Curtis, John B
Torn, Margaret S
Dafflon, Baptiste
Hubbard, Susan S
author_sort Arora, Bhavna
title Evaluating temporal controls on greenhouse gas (GHG) fluxes in an Arctic tundra environment: An entropy-based approach.
title_short Evaluating temporal controls on greenhouse gas (GHG) fluxes in an Arctic tundra environment: An entropy-based approach.
title_full Evaluating temporal controls on greenhouse gas (GHG) fluxes in an Arctic tundra environment: An entropy-based approach.
title_fullStr Evaluating temporal controls on greenhouse gas (GHG) fluxes in an Arctic tundra environment: An entropy-based approach.
title_full_unstemmed Evaluating temporal controls on greenhouse gas (GHG) fluxes in an Arctic tundra environment: An entropy-based approach.
title_sort evaluating temporal controls on greenhouse gas (ghg) fluxes in an arctic tundra environment: an entropy-based approach.
publisher eScholarship, University of California
publishDate 2019
url https://escholarship.org/uc/item/4w411602
geographic Arctic
geographic_facet Arctic
genre Arctic
Climate change
Tundra
genre_facet Arctic
Climate change
Tundra
op_relation qt4w411602
https://escholarship.org/uc/item/4w411602
op_rights public
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