Impact of different eddy covariance sensors, site set-up, and maintenance on the annual balance of CO2 and CH4 in the harsh Arctic environment
Improving year-round data coverage for CO2 and CH4 fluxes in the Arctic is critical for refining the global C budget but continuous measurements are very sparse due to the remote location limiting instrument maintenance, to low power availability, and to extreme weather conditions. The need for tail...
Published in: | Agricultural and Forest Meteorology |
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Format: | Article in Journal/Newspaper |
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Online Access: | https://hal.science/hal-01379666 https://doi.org/10.1016/j.agrformet.2016.07.008 |
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ftunilorrainehal:oai:HAL:hal-01379666v1 2024-04-28T08:10:19+00:00 Impact of different eddy covariance sensors, site set-up, and maintenance on the annual balance of CO2 and CH4 in the harsh Arctic environment Goodrich, J.P. Oechel, W.C. Gioli, B. Moreaux, Virginie Murphy, P.C. Burba, G. Zona, D. San Diego State University (SDSU) National Research Council of Italy Ecologie et Ecophysiologie Forestières devient SILVA en 2018 (EEF) Institut National de la Recherche Agronomique (INRA)-Université de Lorraine (UL) LI-COR Biosciences 2016 https://hal.science/hal-01379666 https://doi.org/10.1016/j.agrformet.2016.07.008 en eng HAL CCSD Elsevier Masson info:eu-repo/semantics/altIdentifier/doi/10.1016/j.agrformet.2016.07.008 hal-01379666 https://hal.science/hal-01379666 doi:10.1016/j.agrformet.2016.07.008 PRODINRA: 372620 WOS: 000383295200020 ISSN: 0168-1923 Agricultural and Forest Meteorology https://hal.science/hal-01379666 Agricultural and Forest Meteorology, 2016, 228-229, pp.239-251. ⟨10.1016/j.agrformet.2016.07.008⟩ [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/article Journal articles 2016 ftunilorrainehal https://doi.org/10.1016/j.agrformet.2016.07.008 2024-04-10T23:56:48Z Improving year-round data coverage for CO2 and CH4 fluxes in the Arctic is critical for refining the global C budget but continuous measurements are very sparse due to the remote location limiting instrument maintenance, to low power availability, and to extreme weather conditions. The need for tailoring instrumentation, site set up, and maintenance at different sites can add uncertainty to estimates of annual C budgets from different ecosystems. In this study, we investigated the influence of different sensor combinations on fluxes of sensible heat, CO2, latent heat (LE), and CH4, and assessed the differences in annual CO2 and CH4 fluxes estimated with different instrumentation at the same sites. Using data from four sites across the North Slope of Alaska, we found that annual CO2 fluxes estimated with heated (7.5 +/- 1.4 gC m(-2) yr(-1)) and non-heated (7.9 +/- 1.3 gC m(-2) yr(-1)) anemometers were within uncertainty bounds. Similarly, despite elevated noise in 30-min flux data, we found that summer CO2 fluxes from open (-17.0 +/- 1.1 gC m(-2) yr(-1)) and close-path (-14.2 +/- 1.7 gC m(-2) yr(-1)) gas analyzers were not significantly different. Annual CH4 fluxes were also within uncertainty bounds when comparing both open (4.5 +/- 0.31 gC m(-2) yr(-1)) and closed-path (4.9 +/- 0.27 gC m(-2) yr(-1)) gas analyzers as well as heated (3.7 +/- 0.26 gC m(-2) yr(-1)) and non-heated (3.7 +/- 0.28 gC m(-2) yr(-1)) anemometers. A continuously heated anemometer increased data coverage (64%) relative to non-heated anemometers (47-52%). However, sensible heat fluxes were over-estimated by 12%, on average, with the heated anemometer, contributing to the overestimation of CO2, CH4, and LE fluxes (mean biases of 0.03 mu mol m(-2) s(-1), 0.05 mgC m(-2) h(-1), and 3.77 W m(-2), respectively). To circumvent this potential bias and reduce power consumption, we implemented an intermittent heating strategy whereby activation only occurred when ice or snow blockage of the transducers, was detected. This resulted in comparable ... Article in Journal/Newspaper Arctic north slope Alaska Université de Lorraine: HAL Agricultural and Forest Meteorology 228-229 239 251 |
institution |
Open Polar |
collection |
Université de Lorraine: HAL |
op_collection_id |
ftunilorrainehal |
language |
English |
topic |
[SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
[SDE.MCG]Environmental Sciences/Global Changes Goodrich, J.P. Oechel, W.C. Gioli, B. Moreaux, Virginie Murphy, P.C. Burba, G. Zona, D. Impact of different eddy covariance sensors, site set-up, and maintenance on the annual balance of CO2 and CH4 in the harsh Arctic environment |
topic_facet |
[SDE.MCG]Environmental Sciences/Global Changes |
description |
Improving year-round data coverage for CO2 and CH4 fluxes in the Arctic is critical for refining the global C budget but continuous measurements are very sparse due to the remote location limiting instrument maintenance, to low power availability, and to extreme weather conditions. The need for tailoring instrumentation, site set up, and maintenance at different sites can add uncertainty to estimates of annual C budgets from different ecosystems. In this study, we investigated the influence of different sensor combinations on fluxes of sensible heat, CO2, latent heat (LE), and CH4, and assessed the differences in annual CO2 and CH4 fluxes estimated with different instrumentation at the same sites. Using data from four sites across the North Slope of Alaska, we found that annual CO2 fluxes estimated with heated (7.5 +/- 1.4 gC m(-2) yr(-1)) and non-heated (7.9 +/- 1.3 gC m(-2) yr(-1)) anemometers were within uncertainty bounds. Similarly, despite elevated noise in 30-min flux data, we found that summer CO2 fluxes from open (-17.0 +/- 1.1 gC m(-2) yr(-1)) and close-path (-14.2 +/- 1.7 gC m(-2) yr(-1)) gas analyzers were not significantly different. Annual CH4 fluxes were also within uncertainty bounds when comparing both open (4.5 +/- 0.31 gC m(-2) yr(-1)) and closed-path (4.9 +/- 0.27 gC m(-2) yr(-1)) gas analyzers as well as heated (3.7 +/- 0.26 gC m(-2) yr(-1)) and non-heated (3.7 +/- 0.28 gC m(-2) yr(-1)) anemometers. A continuously heated anemometer increased data coverage (64%) relative to non-heated anemometers (47-52%). However, sensible heat fluxes were over-estimated by 12%, on average, with the heated anemometer, contributing to the overestimation of CO2, CH4, and LE fluxes (mean biases of 0.03 mu mol m(-2) s(-1), 0.05 mgC m(-2) h(-1), and 3.77 W m(-2), respectively). To circumvent this potential bias and reduce power consumption, we implemented an intermittent heating strategy whereby activation only occurred when ice or snow blockage of the transducers, was detected. This resulted in comparable ... |
author2 |
San Diego State University (SDSU) National Research Council of Italy Ecologie et Ecophysiologie Forestières devient SILVA en 2018 (EEF) Institut National de la Recherche Agronomique (INRA)-Université de Lorraine (UL) LI-COR Biosciences |
format |
Article in Journal/Newspaper |
author |
Goodrich, J.P. Oechel, W.C. Gioli, B. Moreaux, Virginie Murphy, P.C. Burba, G. Zona, D. |
author_facet |
Goodrich, J.P. Oechel, W.C. Gioli, B. Moreaux, Virginie Murphy, P.C. Burba, G. Zona, D. |
author_sort |
Goodrich, J.P. |
title |
Impact of different eddy covariance sensors, site set-up, and maintenance on the annual balance of CO2 and CH4 in the harsh Arctic environment |
title_short |
Impact of different eddy covariance sensors, site set-up, and maintenance on the annual balance of CO2 and CH4 in the harsh Arctic environment |
title_full |
Impact of different eddy covariance sensors, site set-up, and maintenance on the annual balance of CO2 and CH4 in the harsh Arctic environment |
title_fullStr |
Impact of different eddy covariance sensors, site set-up, and maintenance on the annual balance of CO2 and CH4 in the harsh Arctic environment |
title_full_unstemmed |
Impact of different eddy covariance sensors, site set-up, and maintenance on the annual balance of CO2 and CH4 in the harsh Arctic environment |
title_sort |
impact of different eddy covariance sensors, site set-up, and maintenance on the annual balance of co2 and ch4 in the harsh arctic environment |
publisher |
HAL CCSD |
publishDate |
2016 |
url |
https://hal.science/hal-01379666 https://doi.org/10.1016/j.agrformet.2016.07.008 |
genre |
Arctic north slope Alaska |
genre_facet |
Arctic north slope Alaska |
op_source |
ISSN: 0168-1923 Agricultural and Forest Meteorology https://hal.science/hal-01379666 Agricultural and Forest Meteorology, 2016, 228-229, pp.239-251. ⟨10.1016/j.agrformet.2016.07.008⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.agrformet.2016.07.008 hal-01379666 https://hal.science/hal-01379666 doi:10.1016/j.agrformet.2016.07.008 PRODINRA: 372620 WOS: 000383295200020 |
op_doi |
https://doi.org/10.1016/j.agrformet.2016.07.008 |
container_title |
Agricultural and Forest Meteorology |
container_volume |
228-229 |
container_start_page |
239 |
op_container_end_page |
251 |
_version_ |
1797578246691225600 |