Relating CO 2 fluxes to spectral vegetation indices in tundra landscapes: importance of footprint definition
Abstract Carbon flux measurements made at an elevated point are associated with an effective upwind area or ‘footprint.’ Since Arctic tundra landscapes can exhibit substantial heterogeneity within the footprint of an eddy correlation tower, it may be necessary to determine the relative point source...
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Language: | English |
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Cambridge University Press (CUP)
1995
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Online Access: | http://dx.doi.org/10.1017/s0032247400013747 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0032247400013747 |
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crcambridgeupr:10.1017/s0032247400013747 2024-06-23T07:50:33+00:00 Relating CO 2 fluxes to spectral vegetation indices in tundra landscapes: importance of footprint definition Hope, A.S. Fleming, J.B. Vourlitis, G. Stow, D.A. Oechel, W.C. Hack, T. 1995 http://dx.doi.org/10.1017/s0032247400013747 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0032247400013747 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Polar Record volume 31, issue 177, page 245-250 ISSN 0032-2474 1475-3057 journal-article 1995 crcambridgeupr https://doi.org/10.1017/s0032247400013747 2024-06-12T04:04:58Z Abstract Carbon flux measurements made at an elevated point are associated with an effective upwind area or ‘footprint.’ Since Arctic tundra landscapes can exhibit substantial heterogeneity within the footprint of an eddy correlation tower, it may be necessary to determine the relative point source contributions to the observed flux if landscape properties are to be related to the flux. This study evaluates the potential importance of representing footprint source contributions in relationships that are developed between tower observations of net ecosystem exchange of carbon dioxide (NEE) and a remotely sensed spectral vegetation index. Satellite data collected over the foothills region of the North Slope of Alaska are used to determine spatial patterns of a spectral vegetation index in the calculated footprints of 30 randomly selected tower locations. A previously developed relationship between NEE and the vegetation index is used to calculate NEE at each tower location using two techniques, one that explicitly considers the footprint pattern of relative contributions to tower fluxes and another that ignores these patterns. The results indicate that if carbon fluxes measured at a tower are to be related to remotely sensed spectral vegetation indices, then it is necessary to consider the relative flux contributions from within the tower footprints for sites on the North Slope of Alaska. Article in Journal/Newspaper Arctic north slope Polar Record Tundra Alaska Cambridge University Press Arctic Polar Record 31 177 245 250 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
Abstract Carbon flux measurements made at an elevated point are associated with an effective upwind area or ‘footprint.’ Since Arctic tundra landscapes can exhibit substantial heterogeneity within the footprint of an eddy correlation tower, it may be necessary to determine the relative point source contributions to the observed flux if landscape properties are to be related to the flux. This study evaluates the potential importance of representing footprint source contributions in relationships that are developed between tower observations of net ecosystem exchange of carbon dioxide (NEE) and a remotely sensed spectral vegetation index. Satellite data collected over the foothills region of the North Slope of Alaska are used to determine spatial patterns of a spectral vegetation index in the calculated footprints of 30 randomly selected tower locations. A previously developed relationship between NEE and the vegetation index is used to calculate NEE at each tower location using two techniques, one that explicitly considers the footprint pattern of relative contributions to tower fluxes and another that ignores these patterns. The results indicate that if carbon fluxes measured at a tower are to be related to remotely sensed spectral vegetation indices, then it is necessary to consider the relative flux contributions from within the tower footprints for sites on the North Slope of Alaska. |
format |
Article in Journal/Newspaper |
author |
Hope, A.S. Fleming, J.B. Vourlitis, G. Stow, D.A. Oechel, W.C. Hack, T. |
spellingShingle |
Hope, A.S. Fleming, J.B. Vourlitis, G. Stow, D.A. Oechel, W.C. Hack, T. Relating CO 2 fluxes to spectral vegetation indices in tundra landscapes: importance of footprint definition |
author_facet |
Hope, A.S. Fleming, J.B. Vourlitis, G. Stow, D.A. Oechel, W.C. Hack, T. |
author_sort |
Hope, A.S. |
title |
Relating CO 2 fluxes to spectral vegetation indices in tundra landscapes: importance of footprint definition |
title_short |
Relating CO 2 fluxes to spectral vegetation indices in tundra landscapes: importance of footprint definition |
title_full |
Relating CO 2 fluxes to spectral vegetation indices in tundra landscapes: importance of footprint definition |
title_fullStr |
Relating CO 2 fluxes to spectral vegetation indices in tundra landscapes: importance of footprint definition |
title_full_unstemmed |
Relating CO 2 fluxes to spectral vegetation indices in tundra landscapes: importance of footprint definition |
title_sort |
relating co 2 fluxes to spectral vegetation indices in tundra landscapes: importance of footprint definition |
publisher |
Cambridge University Press (CUP) |
publishDate |
1995 |
url |
http://dx.doi.org/10.1017/s0032247400013747 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0032247400013747 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic north slope Polar Record Tundra Alaska |
genre_facet |
Arctic north slope Polar Record Tundra Alaska |
op_source |
Polar Record volume 31, issue 177, page 245-250 ISSN 0032-2474 1475-3057 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0032247400013747 |
container_title |
Polar Record |
container_volume |
31 |
container_issue |
177 |
container_start_page |
245 |
op_container_end_page |
250 |
_version_ |
1802641451477106688 |