Upscaling surface energy fluxes over the North Slope of Alaska using airborne eddy-covariance measurements and environmental response functions
The objective of this study was to upscale airborne flux measurements of sensible heat and latent heat and to develop high-resolution flux maps. In order to support the evaluation of coupled atmospheric–land-surface models we investigated spatial patterns of energy fluxes in relation to land-surface...
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ftdoajarticles:oai:doaj.org/article:590c1bb888ce4248b228088bc2c3b1ff 2023-05-15T15:12:56+02:00 Upscaling surface energy fluxes over the North Slope of Alaska using airborne eddy-covariance measurements and environmental response functions A. Serafimovich S. Metzger J. Hartmann K. Kohnert D. Zona T. Sachs 2018-07-01T00:00:00Z https://doi.org/10.5194/acp-18-10007-2018 https://doaj.org/article/590c1bb888ce4248b228088bc2c3b1ff EN eng Copernicus Publications https://www.atmos-chem-phys.net/18/10007/2018/acp-18-10007-2018.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-18-10007-2018 1680-7316 1680-7324 https://doaj.org/article/590c1bb888ce4248b228088bc2c3b1ff Atmospheric Chemistry and Physics, Vol 18, Pp 10007-10023 (2018) Physics QC1-999 Chemistry QD1-999 article 2018 ftdoajarticles https://doi.org/10.5194/acp-18-10007-2018 2022-12-31T02:45:05Z The objective of this study was to upscale airborne flux measurements of sensible heat and latent heat and to develop high-resolution flux maps. In order to support the evaluation of coupled atmospheric–land-surface models we investigated spatial patterns of energy fluxes in relation to land-surface properties. We used airborne eddy-covariance measurements acquired by the Polar 5 research aircraft in June–July 2012 to analyze surface fluxes. Footprint-weighted surface properties were then related to 21 529 sensible heat flux observations and 25 608 latent heat flux observations using both remote sensing and modeled data. A boosted regression tree technique was used to estimate environmental response functions between spatially and temporally resolved flux observations and corresponding biophysical and meteorological drivers. In order to improve the spatial coverage and spatial representativeness of energy fluxes we used relationships extracted across heterogeneous Arctic landscapes to infer high-resolution surface energy flux maps, thus directly upscaling the observational data. These maps of projected sensible heat and latent heat fluxes were used to assess energy partitioning in northern ecosystems and to determine the dominant energy exchange processes in permafrost areas. This allowed us to estimate energy fluxes for specific types of land cover, taking into account meteorological conditions. Airborne and modeled fluxes were then compared with measurements from an eddy-covariance tower near Atqasuk. Our results are an important contribution for the advanced, scale-dependent quantification of surface energy fluxes and they provide new insights into the processes affecting these fluxes for the main vegetation types in high-latitude permafrost areas. Article in Journal/Newspaper Arctic north slope permafrost Alaska Directory of Open Access Journals: DOAJ Articles Arctic Atmospheric Chemistry and Physics 18 13 10007 10023 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Physics QC1-999 Chemistry QD1-999 |
spellingShingle |
Physics QC1-999 Chemistry QD1-999 A. Serafimovich S. Metzger J. Hartmann K. Kohnert D. Zona T. Sachs Upscaling surface energy fluxes over the North Slope of Alaska using airborne eddy-covariance measurements and environmental response functions |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
The objective of this study was to upscale airborne flux measurements of sensible heat and latent heat and to develop high-resolution flux maps. In order to support the evaluation of coupled atmospheric–land-surface models we investigated spatial patterns of energy fluxes in relation to land-surface properties. We used airborne eddy-covariance measurements acquired by the Polar 5 research aircraft in June–July 2012 to analyze surface fluxes. Footprint-weighted surface properties were then related to 21 529 sensible heat flux observations and 25 608 latent heat flux observations using both remote sensing and modeled data. A boosted regression tree technique was used to estimate environmental response functions between spatially and temporally resolved flux observations and corresponding biophysical and meteorological drivers. In order to improve the spatial coverage and spatial representativeness of energy fluxes we used relationships extracted across heterogeneous Arctic landscapes to infer high-resolution surface energy flux maps, thus directly upscaling the observational data. These maps of projected sensible heat and latent heat fluxes were used to assess energy partitioning in northern ecosystems and to determine the dominant energy exchange processes in permafrost areas. This allowed us to estimate energy fluxes for specific types of land cover, taking into account meteorological conditions. Airborne and modeled fluxes were then compared with measurements from an eddy-covariance tower near Atqasuk. Our results are an important contribution for the advanced, scale-dependent quantification of surface energy fluxes and they provide new insights into the processes affecting these fluxes for the main vegetation types in high-latitude permafrost areas. |
format |
Article in Journal/Newspaper |
author |
A. Serafimovich S. Metzger J. Hartmann K. Kohnert D. Zona T. Sachs |
author_facet |
A. Serafimovich S. Metzger J. Hartmann K. Kohnert D. Zona T. Sachs |
author_sort |
A. Serafimovich |
title |
Upscaling surface energy fluxes over the North Slope of Alaska using airborne eddy-covariance measurements and environmental response functions |
title_short |
Upscaling surface energy fluxes over the North Slope of Alaska using airborne eddy-covariance measurements and environmental response functions |
title_full |
Upscaling surface energy fluxes over the North Slope of Alaska using airborne eddy-covariance measurements and environmental response functions |
title_fullStr |
Upscaling surface energy fluxes over the North Slope of Alaska using airborne eddy-covariance measurements and environmental response functions |
title_full_unstemmed |
Upscaling surface energy fluxes over the North Slope of Alaska using airborne eddy-covariance measurements and environmental response functions |
title_sort |
upscaling surface energy fluxes over the north slope of alaska using airborne eddy-covariance measurements and environmental response functions |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/acp-18-10007-2018 https://doaj.org/article/590c1bb888ce4248b228088bc2c3b1ff |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic north slope permafrost Alaska |
genre_facet |
Arctic north slope permafrost Alaska |
op_source |
Atmospheric Chemistry and Physics, Vol 18, Pp 10007-10023 (2018) |
op_relation |
https://www.atmos-chem-phys.net/18/10007/2018/acp-18-10007-2018.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-18-10007-2018 1680-7316 1680-7324 https://doaj.org/article/590c1bb888ce4248b228088bc2c3b1ff |
op_doi |
https://doi.org/10.5194/acp-18-10007-2018 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
18 |
container_issue |
13 |
container_start_page |
10007 |
op_container_end_page |
10023 |
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1766343548473442304 |