The Polar Vegetation Photosynthesis and Respiration Model: a parsimonious, satellite-data-driven model of high-latitude CO2 exchange
We introduce the Polar Vegetation Photosynthesis and Respiration Model (PolarVPRM), a remote-sensing-based approach for generating accurate, high-resolution (≥ 1 km 2 , 3 hourly) estimates of net ecosystem CO 2 exchange (NEE). PolarVPRM simulates NEE using polar-specific vegetation classes, and by r...
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Online Access: | https://doi.org/10.5194/gmd-8-2655-2015 https://gmd.copernicus.org/articles/8/2655/2015/ |
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ftcopernicus:oai:publications.copernicus.org:gmd28395 2023-05-15T15:09:55+02:00 The Polar Vegetation Photosynthesis and Respiration Model: a parsimonious, satellite-data-driven model of high-latitude CO2 exchange Luus, K. A. Lin, J. C. 2018-09-27 application/pdf https://doi.org/10.5194/gmd-8-2655-2015 https://gmd.copernicus.org/articles/8/2655/2015/ eng eng doi:10.5194/gmd-8-2655-2015 https://gmd.copernicus.org/articles/8/2655/2015/ eISSN: 1991-9603 Text 2018 ftcopernicus https://doi.org/10.5194/gmd-8-2655-2015 2020-07-20T16:24:29Z We introduce the Polar Vegetation Photosynthesis and Respiration Model (PolarVPRM), a remote-sensing-based approach for generating accurate, high-resolution (≥ 1 km 2 , 3 hourly) estimates of net ecosystem CO 2 exchange (NEE). PolarVPRM simulates NEE using polar-specific vegetation classes, and by representing high-latitude influences on NEE, such as the influence of soil temperature on subnivean respiration. We present a description, validation and error analysis (first-order Taylor expansion) of PolarVPRM, followed by an examination of per-pixel trends (2001–2012) in model output for the North American terrestrial region north of 55° N. PolarVPRM was validated against eddy covariance (EC) observations from nine North American sites, of which three were used in model calibration. Comparisons of EC NEE to NEE from three models indicated that PolarVPRM displayed similar or better statistical agreement with eddy covariance observations than existing models showed. Trend analysis (2001–2012) indicated that warming air temperatures and drought stress in forests increased growing season rates of respiration, and decreased rates of net carbon uptake by vegetation when air temperatures exceeded optimal temperatures for photosynthesis. Concurrent increases in growing season length at Arctic tundra sites allowed for increases in photosynthetic uptake over time by tundra vegetation. PolarVPRM estimated that the North American high-latitude region changed from a carbon source (2001–2004) to a carbon sink (2005–2010) to again a source (2011–2012) in response to changing environmental conditions. Text Arctic Tundra Copernicus Publications: E-Journals Arctic Geoscientific Model Development 8 8 2655 2674 |
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Copernicus Publications: E-Journals |
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English |
description |
We introduce the Polar Vegetation Photosynthesis and Respiration Model (PolarVPRM), a remote-sensing-based approach for generating accurate, high-resolution (≥ 1 km 2 , 3 hourly) estimates of net ecosystem CO 2 exchange (NEE). PolarVPRM simulates NEE using polar-specific vegetation classes, and by representing high-latitude influences on NEE, such as the influence of soil temperature on subnivean respiration. We present a description, validation and error analysis (first-order Taylor expansion) of PolarVPRM, followed by an examination of per-pixel trends (2001–2012) in model output for the North American terrestrial region north of 55° N. PolarVPRM was validated against eddy covariance (EC) observations from nine North American sites, of which three were used in model calibration. Comparisons of EC NEE to NEE from three models indicated that PolarVPRM displayed similar or better statistical agreement with eddy covariance observations than existing models showed. Trend analysis (2001–2012) indicated that warming air temperatures and drought stress in forests increased growing season rates of respiration, and decreased rates of net carbon uptake by vegetation when air temperatures exceeded optimal temperatures for photosynthesis. Concurrent increases in growing season length at Arctic tundra sites allowed for increases in photosynthetic uptake over time by tundra vegetation. PolarVPRM estimated that the North American high-latitude region changed from a carbon source (2001–2004) to a carbon sink (2005–2010) to again a source (2011–2012) in response to changing environmental conditions. |
format |
Text |
author |
Luus, K. A. Lin, J. C. |
spellingShingle |
Luus, K. A. Lin, J. C. The Polar Vegetation Photosynthesis and Respiration Model: a parsimonious, satellite-data-driven model of high-latitude CO2 exchange |
author_facet |
Luus, K. A. Lin, J. C. |
author_sort |
Luus, K. A. |
title |
The Polar Vegetation Photosynthesis and Respiration Model: a parsimonious, satellite-data-driven model of high-latitude CO2 exchange |
title_short |
The Polar Vegetation Photosynthesis and Respiration Model: a parsimonious, satellite-data-driven model of high-latitude CO2 exchange |
title_full |
The Polar Vegetation Photosynthesis and Respiration Model: a parsimonious, satellite-data-driven model of high-latitude CO2 exchange |
title_fullStr |
The Polar Vegetation Photosynthesis and Respiration Model: a parsimonious, satellite-data-driven model of high-latitude CO2 exchange |
title_full_unstemmed |
The Polar Vegetation Photosynthesis and Respiration Model: a parsimonious, satellite-data-driven model of high-latitude CO2 exchange |
title_sort |
polar vegetation photosynthesis and respiration model: a parsimonious, satellite-data-driven model of high-latitude co2 exchange |
publishDate |
2018 |
url |
https://doi.org/10.5194/gmd-8-2655-2015 https://gmd.copernicus.org/articles/8/2655/2015/ |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Tundra |
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Arctic Tundra |
op_source |
eISSN: 1991-9603 |
op_relation |
doi:10.5194/gmd-8-2655-2015 https://gmd.copernicus.org/articles/8/2655/2015/ |
op_doi |
https://doi.org/10.5194/gmd-8-2655-2015 |
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Geoscientific Model Development |
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8 |
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2655 |
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