Seasonal changes in GPP/SIF ratios and their climatic determinants across the Northern Hemisphere
Abstract Satellite‐derived sun‐induced chlorophyll fluorescence (SIF) has been increasingly used for estimating gross primary production (GPP). However, the relationship between SIF and GPP has not been well defined, impeding the translation of satellite observed SIF to GPP. Previous studies have ge...
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crwiley:10.1111/gcb.15775 2024-09-30T14:31:49+00:00 Seasonal changes in GPP/SIF ratios and their climatic determinants across the Northern Hemisphere Chen, Anping Mao, Jiafu Ricciuto, Daniel Lu, Dan Xiao, Jingfeng Li, Xing Thornton, Peter E. Knapp, Alan K. Oak Ridge National Laboratory National Science Foundation 2021 http://dx.doi.org/10.1111/gcb.15775 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.15775 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/gcb.15775 https://onlinelibrary.wiley.com/doi/am-pdf/10.1111/gcb.15775 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor Global Change Biology volume 27, issue 20, page 5186-5197 ISSN 1354-1013 1365-2486 journal-article 2021 crwiley https://doi.org/10.1111/gcb.15775 2024-09-19T04:19:59Z Abstract Satellite‐derived sun‐induced chlorophyll fluorescence (SIF) has been increasingly used for estimating gross primary production (GPP). However, the relationship between SIF and GPP has not been well defined, impeding the translation of satellite observed SIF to GPP. Previous studies have generally assumed a linear relationship between SIF and GPP at daily and longer time scales, but support for this assumption is lacking. Here, we used the GPP/SIF ratio to investigate seasonal variations in the relationship between SIF and GPP over the Northern Hemisphere (NH). Based on multiple SIF products and MODIS and FLUXCOM GPP data, we found strong seasonal hump‐shaped patterns for the GPP/SIF ratio over northern latitudes, with higher values in the summer than in the spring or autumn. This hump‐shaped GPP/SIF seasonal variation was confirmed by examining different SIF products and was evident for most vegetation types except evergreen broadleaf forests. The seasonal amplitude of the GPP/SIF ratio decreased from the boreal/arctic region to drylands and the tropics. For most of the NH, the lowest GPP/SIF values occurred in October or September, while the maximum GPP/SIF values were evident in June and July. The most pronounced seasonal amplitude of GPP/SIF occurred in intermediate temperature and precipitation ranges. GPP/SIF was positively related to temperature in the early and late parts of the growing season, but not during the peak growing months. These shifting relationships between temperature and GPP/SIF across different months appeared to play a key role in the seasonal dynamics of GPP/SIF. Several mechanisms may explain the patterns we observed, and future research encompassing a broad range of climate and vegetation settings is needed to improve our understanding of the spatial and temporal relationships between SIF and GPP. Nonetheless, the strong seasonal variation in GPP/SIF we identified highlights the importance of incorporating this behavior into SIF‐based GPP estimations. Article in Journal/Newspaper Arctic Wiley Online Library Arctic Global Change Biology 27 20 5186 5197 |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Satellite‐derived sun‐induced chlorophyll fluorescence (SIF) has been increasingly used for estimating gross primary production (GPP). However, the relationship between SIF and GPP has not been well defined, impeding the translation of satellite observed SIF to GPP. Previous studies have generally assumed a linear relationship between SIF and GPP at daily and longer time scales, but support for this assumption is lacking. Here, we used the GPP/SIF ratio to investigate seasonal variations in the relationship between SIF and GPP over the Northern Hemisphere (NH). Based on multiple SIF products and MODIS and FLUXCOM GPP data, we found strong seasonal hump‐shaped patterns for the GPP/SIF ratio over northern latitudes, with higher values in the summer than in the spring or autumn. This hump‐shaped GPP/SIF seasonal variation was confirmed by examining different SIF products and was evident for most vegetation types except evergreen broadleaf forests. The seasonal amplitude of the GPP/SIF ratio decreased from the boreal/arctic region to drylands and the tropics. For most of the NH, the lowest GPP/SIF values occurred in October or September, while the maximum GPP/SIF values were evident in June and July. The most pronounced seasonal amplitude of GPP/SIF occurred in intermediate temperature and precipitation ranges. GPP/SIF was positively related to temperature in the early and late parts of the growing season, but not during the peak growing months. These shifting relationships between temperature and GPP/SIF across different months appeared to play a key role in the seasonal dynamics of GPP/SIF. Several mechanisms may explain the patterns we observed, and future research encompassing a broad range of climate and vegetation settings is needed to improve our understanding of the spatial and temporal relationships between SIF and GPP. Nonetheless, the strong seasonal variation in GPP/SIF we identified highlights the importance of incorporating this behavior into SIF‐based GPP estimations. |
author2 |
Oak Ridge National Laboratory National Science Foundation |
format |
Article in Journal/Newspaper |
author |
Chen, Anping Mao, Jiafu Ricciuto, Daniel Lu, Dan Xiao, Jingfeng Li, Xing Thornton, Peter E. Knapp, Alan K. |
spellingShingle |
Chen, Anping Mao, Jiafu Ricciuto, Daniel Lu, Dan Xiao, Jingfeng Li, Xing Thornton, Peter E. Knapp, Alan K. Seasonal changes in GPP/SIF ratios and their climatic determinants across the Northern Hemisphere |
author_facet |
Chen, Anping Mao, Jiafu Ricciuto, Daniel Lu, Dan Xiao, Jingfeng Li, Xing Thornton, Peter E. Knapp, Alan K. |
author_sort |
Chen, Anping |
title |
Seasonal changes in GPP/SIF ratios and their climatic determinants across the Northern Hemisphere |
title_short |
Seasonal changes in GPP/SIF ratios and their climatic determinants across the Northern Hemisphere |
title_full |
Seasonal changes in GPP/SIF ratios and their climatic determinants across the Northern Hemisphere |
title_fullStr |
Seasonal changes in GPP/SIF ratios and their climatic determinants across the Northern Hemisphere |
title_full_unstemmed |
Seasonal changes in GPP/SIF ratios and their climatic determinants across the Northern Hemisphere |
title_sort |
seasonal changes in gpp/sif ratios and their climatic determinants across the northern hemisphere |
publisher |
Wiley |
publishDate |
2021 |
url |
http://dx.doi.org/10.1111/gcb.15775 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.15775 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/gcb.15775 https://onlinelibrary.wiley.com/doi/am-pdf/10.1111/gcb.15775 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Global Change Biology volume 27, issue 20, page 5186-5197 ISSN 1354-1013 1365-2486 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/gcb.15775 |
container_title |
Global Change Biology |
container_volume |
27 |
container_issue |
20 |
container_start_page |
5186 |
op_container_end_page |
5197 |
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1811636168657207296 |