Modelling carbon uptake in Nordic forest landscapes using remote sensing
(2023)- Abstract
- Boreal forests and peatlands store over 30% of the global terrestrial carbon in their vegetation and soil. but changing climate can compromise the current carbon stock. Rising air temperatures, changing precipitation patterns and increased risk of natural disturbances can impact the ability of the boreal ecosystems to absorb and store carbon, reducing their effectiveness as carbon sinks. Reliable estimates of carbon fluxes between these ecosystems and the atmosphere are crucial for understanding the ecosystem response to climate change. This thesis focuses on developing remote sensing-based models
of the vegetation carbon uptake i.e. gross primary production (GPP) in Nordic forests and peatlands, and upscaling the estimates from sites... (More) - Boreal forests and peatlands store over 30% of the global terrestrial carbon in their vegetation and soil. but changing climate can compromise the current carbon stock. Rising air temperatures, changing precipitation patterns and increased risk of natural disturbances can impact the ability of the boreal ecosystems to absorb and store carbon, reducing their effectiveness as carbon sinks. Reliable estimates of carbon fluxes between these ecosystems and the atmosphere are crucial for understanding the ecosystem response to climate change. This thesis focuses on developing remote sensing-based models
of the vegetation carbon uptake i.e. gross primary production (GPP) in Nordic forests and peatlands, and upscaling the estimates from sites to landscape and regional levels.
The results demonstrate that spectral vegetation indices EVI2 and PPI can capture the seasonal dynamics of GPP well. In general, other environmental variables that further helped to improve the results were air temperature, photosynthetically active radiation (PAR), and vapour pressure deficit
(VPD) that expresses atmospheric demand for water. Another finding was that the spatial resolution of the satellite instrument had less influence on the accuracy of GPP estimates than the model formulation and selection of the input data. The result suggested that vegetation productivity can be monitored at various scales with high accuracy using satellite remote sensing data. Fine-scale
estimates are beneficial when monitoring individual forest stands or spatially heterogeneous ecosystems like peatlands.
Various model formulations were tested to estimate GPP with remotely sensed data. The site-specific calibration gave more accurate results, but the single parameter set per ecosystem type was more applicable for upscaling GPP for a larger area. In addition, we found that PPI performed well and
provided a useful tool for estimating GPP at local and regional scales. Despite the good agreement with the eddy covariance-derived GPP, the models could be further improved to capture the spatial heterogeneity between the sites by adding e.g. soil moisture data. Finally, we applied a PPI-based model to estimate annual GPP in Sweden’s forests and peatlands with a 10-meters spatial resolution. This thesis highlights that satellite remote sensing has a great potential for monitoring variations changes in vegetation carbon uptake in Nordic forest and peatland ecosystems. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/b56ee12f-b3ef-4b66-b9cc-186f02723dde
- author
- Junttila, Sofia LU
- supervisor
-
- Lars Eklundh LU
- Natascha Kljun LU
- Jonas Ardö LU
- Torbern Tagesson LU
- opponent
-
- Professor Ollinger, Scott, University of New Hampshire
- organization
- publishing date
- 2023
- type
- Thesis
- publication status
- published
- subject
- keywords
- forest, peatland, boreal region, remote sensing, carbon exchange, gross primary production, CO2, climate change, Sentinel-2
- pages
- 186 pages
- publisher
- Lund University (Media-Tryck)
- defense location
- Världen, Geocentrum I, Sölvegatan 10, Lund
- defense date
- 2023-03-31 13:00:00
- ISBN
- 978-91-89187-23-8
- 978-91-89187-24-5
- project
- Upscaling carbon fluxes to a landscape
- language
- English
- LU publication?
- yes
- id
- b56ee12f-b3ef-4b66-b9cc-186f02723dde
- date added to LUP
- 2023-02-28 15:52:05
- date last changed
- 2023-03-08 09:24:55
@phdthesis{b56ee12f-b3ef-4b66-b9cc-186f02723dde,
abstract = {{Boreal forests and peatlands store over 30% of the global terrestrial carbon in their vegetation and soil. but changing climate can compromise the current carbon stock. Rising air temperatures, changing precipitation patterns and increased risk of natural disturbances can impact the ability of the boreal ecosystems to absorb and store carbon, reducing their effectiveness as carbon sinks. Reliable estimates of carbon fluxes between these ecosystems and the atmosphere are crucial for understanding the ecosystem response to climate change. This thesis focuses on developing remote sensing-based models<br/>of the vegetation carbon uptake i.e. gross primary production (GPP) in Nordic forests and peatlands, and upscaling the estimates from sites to landscape and regional levels.<br/><br/>The results demonstrate that spectral vegetation indices EVI2 and PPI can capture the seasonal dynamics of GPP well. In general, other environmental variables that further helped to improve the results were air temperature, photosynthetically active radiation (PAR), and vapour pressure deficit<br/>(VPD) that expresses atmospheric demand for water. Another finding was that the spatial resolution of the satellite instrument had less influence on the accuracy of GPP estimates than the model formulation and selection of the input data. The result suggested that vegetation productivity can be monitored at various scales with high accuracy using satellite remote sensing data. Fine-scale<br/>estimates are beneficial when monitoring individual forest stands or spatially heterogeneous ecosystems like peatlands.<br/><br/>Various model formulations were tested to estimate GPP with remotely sensed data. The site-specific calibration gave more accurate results, but the single parameter set per ecosystem type was more applicable for upscaling GPP for a larger area. In addition, we found that PPI performed well and<br/>provided a useful tool for estimating GPP at local and regional scales. Despite the good agreement with the eddy covariance-derived GPP, the models could be further improved to capture the spatial heterogeneity between the sites by adding e.g. soil moisture data. Finally, we applied a PPI-based model to estimate annual GPP in Sweden’s forests and peatlands with a 10-meters spatial resolution. This thesis highlights that satellite remote sensing has a great potential for monitoring variations changes in vegetation carbon uptake in Nordic forest and peatland ecosystems.}},
author = {{Junttila, Sofia}},
isbn = {{978-91-89187-23-8}},
keywords = {{forest; peatland; boreal region; remote sensing; carbon exchange; gross primary production; CO2; climate change; Sentinel-2}},
language = {{eng}},
publisher = {{Lund University (Media-Tryck)}},
school = {{Lund University}},
title = {{Modelling carbon uptake in Nordic forest landscapes using remote sensing}},
url = {{https://lup.lub.lu.se/search/files/139162960/Sofia_Junttila_kappa.pdf}},
year = {{2023}},
}