Biological processes dominate seasonality of remotely sensed canopy greenness in an Amazon evergreen forest
Autor(a) principal: | |
---|---|
Data de Publicação: | 2018 |
Outros Autores: | , , , , , , , , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional do INPA |
Texto Completo: | https://repositorio.inpa.gov.br/handle/1/15658 |
Resumo: | Satellite observations of Amazon forests show seasonal and interannual variations, but the underlying biological processes remain debated. Here we combined radiative transfer models (RTMs) with field observations of Amazon forest leaf and canopy characteristics to test three hypotheses for satellite-observed canopy reflectance seasonality: seasonal changes in leaf area index, in canopy-surface leafless crown fraction and/or in leaf demography. Canopy RTMs (PROSAIL and FLiES), driven by these three factors combined, simulated satellite-observed seasonal patterns well, explaining c. 70% of the variability in a key reflectance-based vegetation index (MAIAC EVI, which removes artifacts that would otherwise arise from clouds/aerosols and sun–sensor geometry). Leaf area index, leafless crown fraction and leaf demography independently accounted for 1, 33 and 66% of FLiES-simulated EVI seasonality, respectively. These factors also strongly influenced modeled near-infrared (NIR) reflectance, explaining why both modeled and observed EVI, which is especially sensitive to NIR, captures canopy seasonal dynamics well. Our improved analysis of canopy-scale biophysics rules out satellite artifacts as significant causes of satellite-observed seasonal patterns at this site, implying that aggregated phenology explains the larger scale remotely observed patterns. This work significantly reconciles current controversies about satellite-detected Amazon phenology, and improves our use of satellite observations to study climate–phenology relationships in the tropics. No claim to original US Government works New Phytologist © 2017 New Phytologist Trust |
id |
INPA-2_82cf99369b940dfb9891814554036493 |
---|---|
oai_identifier_str |
oai:repositorio:1/15658 |
network_acronym_str |
INPA-2 |
network_name_str |
Repositório Institucional do INPA |
repository_id_str |
|
spelling |
Wu, JinKobayashi, HidekiStark, Scott C.Meng, RanGuan, KaiyuTran, Ngoc NguyenGao, SicongYang, WeiRestrepo-Coupé, NataliaMiura, TomoakiOliviera, Raimundo CosmeRogers, AlistairDye, Dennis G.Nelson, Bruce WalkerSerbin, Shawn P.Huete, Alfredo RamonSaleska, Scott Reid2020-05-15T19:22:54Z2020-05-15T19:22:54Z2018https://repositorio.inpa.gov.br/handle/1/1565810.1111/nph.14939Satellite observations of Amazon forests show seasonal and interannual variations, but the underlying biological processes remain debated. Here we combined radiative transfer models (RTMs) with field observations of Amazon forest leaf and canopy characteristics to test three hypotheses for satellite-observed canopy reflectance seasonality: seasonal changes in leaf area index, in canopy-surface leafless crown fraction and/or in leaf demography. Canopy RTMs (PROSAIL and FLiES), driven by these three factors combined, simulated satellite-observed seasonal patterns well, explaining c. 70% of the variability in a key reflectance-based vegetation index (MAIAC EVI, which removes artifacts that would otherwise arise from clouds/aerosols and sun–sensor geometry). Leaf area index, leafless crown fraction and leaf demography independently accounted for 1, 33 and 66% of FLiES-simulated EVI seasonality, respectively. These factors also strongly influenced modeled near-infrared (NIR) reflectance, explaining why both modeled and observed EVI, which is especially sensitive to NIR, captures canopy seasonal dynamics well. Our improved analysis of canopy-scale biophysics rules out satellite artifacts as significant causes of satellite-observed seasonal patterns at this site, implying that aggregated phenology explains the larger scale remotely observed patterns. This work significantly reconciles current controversies about satellite-detected Amazon phenology, and improves our use of satellite observations to study climate–phenology relationships in the tropics. No claim to original US Government works New Phytologist © 2017 New Phytologist TrustVolume 217, Número 4, Pags. 1507-1520Attribution-NonCommercial-NoDerivs 3.0 Brazilhttp://creativecommons.org/licenses/by-nc-nd/3.0/br/info:eu-repo/semantics/openAccessAnnual VariationCanopy ArchitectureEvergreen ForestHypothesis TestingLeaf Area IndexLidarPhenologyRadiative TransferRemote SensingSatellite DataSeasonalityWorldviewAmazoniaBiological ModelCellular, Subcellular And Molecular Biological Phenomena And FunctionsForestGrowth, Development And AgingLight Related PhenomenaPhysiologyPlant LeafSeasonBiological PhenomenaForestsModels, BiologicalOptical PhenomenaPlant LeavesSeasonsBiological processes dominate seasonality of remotely sensed canopy greenness in an Amazon evergreen forestinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleNew Phytologistengreponame:Repositório Institucional do INPAinstname:Instituto Nacional de Pesquisas da Amazônia (INPA)instacron:INPAORIGINALartigo-inpa.pdfartigo-inpa.pdfapplication/pdf1331683https://repositorio.inpa.gov.br/bitstream/1/15658/1/artigo-inpa.pdf74be604779b66b86565acb625d2e6b50MD511/156582020-05-15 15:33:19.445oai:repositorio:1/15658Repositório de PublicaçõesPUBhttps://repositorio.inpa.gov.br/oai/requestopendoar:2020-05-15T19:33:19Repositório Institucional do INPA - Instituto Nacional de Pesquisas da Amazônia (INPA)false |
dc.title.en.fl_str_mv |
Biological processes dominate seasonality of remotely sensed canopy greenness in an Amazon evergreen forest |
title |
Biological processes dominate seasonality of remotely sensed canopy greenness in an Amazon evergreen forest |
spellingShingle |
Biological processes dominate seasonality of remotely sensed canopy greenness in an Amazon evergreen forest Wu, Jin Annual Variation Canopy Architecture Evergreen Forest Hypothesis Testing Leaf Area Index Lidar Phenology Radiative Transfer Remote Sensing Satellite Data Seasonality Worldview Amazonia Biological Model Cellular, Subcellular And Molecular Biological Phenomena And Functions Forest Growth, Development And Aging Light Related Phenomena Physiology Plant Leaf Season Biological Phenomena Forests Models, Biological Optical Phenomena Plant Leaves Seasons |
title_short |
Biological processes dominate seasonality of remotely sensed canopy greenness in an Amazon evergreen forest |
title_full |
Biological processes dominate seasonality of remotely sensed canopy greenness in an Amazon evergreen forest |
title_fullStr |
Biological processes dominate seasonality of remotely sensed canopy greenness in an Amazon evergreen forest |
title_full_unstemmed |
Biological processes dominate seasonality of remotely sensed canopy greenness in an Amazon evergreen forest |
title_sort |
Biological processes dominate seasonality of remotely sensed canopy greenness in an Amazon evergreen forest |
author |
Wu, Jin |
author_facet |
Wu, Jin Kobayashi, Hideki Stark, Scott C. Meng, Ran Guan, Kaiyu Tran, Ngoc Nguyen Gao, Sicong Yang, Wei Restrepo-Coupé, Natalia Miura, Tomoaki Oliviera, Raimundo Cosme Rogers, Alistair Dye, Dennis G. Nelson, Bruce Walker Serbin, Shawn P. Huete, Alfredo Ramon Saleska, Scott Reid |
author_role |
author |
author2 |
Kobayashi, Hideki Stark, Scott C. Meng, Ran Guan, Kaiyu Tran, Ngoc Nguyen Gao, Sicong Yang, Wei Restrepo-Coupé, Natalia Miura, Tomoaki Oliviera, Raimundo Cosme Rogers, Alistair Dye, Dennis G. Nelson, Bruce Walker Serbin, Shawn P. Huete, Alfredo Ramon Saleska, Scott Reid |
author2_role |
author author author author author author author author author author author author author author author author |
dc.contributor.author.fl_str_mv |
Wu, Jin Kobayashi, Hideki Stark, Scott C. Meng, Ran Guan, Kaiyu Tran, Ngoc Nguyen Gao, Sicong Yang, Wei Restrepo-Coupé, Natalia Miura, Tomoaki Oliviera, Raimundo Cosme Rogers, Alistair Dye, Dennis G. Nelson, Bruce Walker Serbin, Shawn P. Huete, Alfredo Ramon Saleska, Scott Reid |
dc.subject.eng.fl_str_mv |
Annual Variation Canopy Architecture Evergreen Forest Hypothesis Testing Leaf Area Index Lidar Phenology Radiative Transfer Remote Sensing Satellite Data Seasonality Worldview Amazonia Biological Model Cellular, Subcellular And Molecular Biological Phenomena And Functions Forest Growth, Development And Aging Light Related Phenomena Physiology Plant Leaf Season Biological Phenomena Forests Models, Biological Optical Phenomena Plant Leaves Seasons |
topic |
Annual Variation Canopy Architecture Evergreen Forest Hypothesis Testing Leaf Area Index Lidar Phenology Radiative Transfer Remote Sensing Satellite Data Seasonality Worldview Amazonia Biological Model Cellular, Subcellular And Molecular Biological Phenomena And Functions Forest Growth, Development And Aging Light Related Phenomena Physiology Plant Leaf Season Biological Phenomena Forests Models, Biological Optical Phenomena Plant Leaves Seasons |
description |
Satellite observations of Amazon forests show seasonal and interannual variations, but the underlying biological processes remain debated. Here we combined radiative transfer models (RTMs) with field observations of Amazon forest leaf and canopy characteristics to test three hypotheses for satellite-observed canopy reflectance seasonality: seasonal changes in leaf area index, in canopy-surface leafless crown fraction and/or in leaf demography. Canopy RTMs (PROSAIL and FLiES), driven by these three factors combined, simulated satellite-observed seasonal patterns well, explaining c. 70% of the variability in a key reflectance-based vegetation index (MAIAC EVI, which removes artifacts that would otherwise arise from clouds/aerosols and sun–sensor geometry). Leaf area index, leafless crown fraction and leaf demography independently accounted for 1, 33 and 66% of FLiES-simulated EVI seasonality, respectively. These factors also strongly influenced modeled near-infrared (NIR) reflectance, explaining why both modeled and observed EVI, which is especially sensitive to NIR, captures canopy seasonal dynamics well. Our improved analysis of canopy-scale biophysics rules out satellite artifacts as significant causes of satellite-observed seasonal patterns at this site, implying that aggregated phenology explains the larger scale remotely observed patterns. This work significantly reconciles current controversies about satellite-detected Amazon phenology, and improves our use of satellite observations to study climate–phenology relationships in the tropics. No claim to original US Government works New Phytologist © 2017 New Phytologist Trust |
publishDate |
2018 |
dc.date.issued.fl_str_mv |
2018 |
dc.date.accessioned.fl_str_mv |
2020-05-15T19:22:54Z |
dc.date.available.fl_str_mv |
2020-05-15T19:22:54Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://repositorio.inpa.gov.br/handle/1/15658 |
dc.identifier.doi.none.fl_str_mv |
10.1111/nph.14939 |
url |
https://repositorio.inpa.gov.br/handle/1/15658 |
identifier_str_mv |
10.1111/nph.14939 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Volume 217, Número 4, Pags. 1507-1520 |
dc.rights.driver.fl_str_mv |
Attribution-NonCommercial-NoDerivs 3.0 Brazil http://creativecommons.org/licenses/by-nc-nd/3.0/br/ info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Attribution-NonCommercial-NoDerivs 3.0 Brazil http://creativecommons.org/licenses/by-nc-nd/3.0/br/ |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
New Phytologist |
publisher.none.fl_str_mv |
New Phytologist |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional do INPA instname:Instituto Nacional de Pesquisas da Amazônia (INPA) instacron:INPA |
instname_str |
Instituto Nacional de Pesquisas da Amazônia (INPA) |
instacron_str |
INPA |
institution |
INPA |
reponame_str |
Repositório Institucional do INPA |
collection |
Repositório Institucional do INPA |
bitstream.url.fl_str_mv |
https://repositorio.inpa.gov.br/bitstream/1/15658/1/artigo-inpa.pdf |
bitstream.checksum.fl_str_mv |
74be604779b66b86565acb625d2e6b50 |
bitstream.checksumAlgorithm.fl_str_mv |
MD5 |
repository.name.fl_str_mv |
Repositório Institucional do INPA - Instituto Nacional de Pesquisas da Amazônia (INPA) |
repository.mail.fl_str_mv |
|
_version_ |
1809928893242540032 |