Editorial for Special Issue: “Remotely Sensed Albedo”
International audience Land surface (bare soil, vegetation, and snow) albedo is an essential climate variable that affects the Earth's radiation budget, and therefore, is of vital interest for a broad number of applications: Thematic (urban, cryosphere, land cover, and bare soil), climate (Long...
Published in: | Remote Sensing |
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Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2019
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Online Access: | https://hal.science/hal-02354398 https://hal.science/hal-02354398/document https://hal.science/hal-02354398/file/remotesensing-11-01941.pdf https://doi.org/10.3390/rs11161941 |
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ftutoulouse3hal:oai:HAL:hal-02354398v1 |
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openpolar |
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Open Polar |
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Université Toulouse III - Paul Sabatier: HAL-UPS |
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ftutoulouse3hal |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDE]Environmental Sciences |
spellingShingle |
[SDU]Sciences of the Universe [physics] [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDE]Environmental Sciences Roujean, Jean-Louis Liang, Shunlin He, Tao Editorial for Special Issue: “Remotely Sensed Albedo” |
topic_facet |
[SDU]Sciences of the Universe [physics] [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDE]Environmental Sciences |
description |
International audience Land surface (bare soil, vegetation, and snow) albedo is an essential climate variable that affects the Earth's radiation budget, and therefore, is of vital interest for a broad number of applications: Thematic (urban, cryosphere, land cover, and bare soil), climate (Long Term Data Record), processing technics (gap filling, data merging), and products validation (cal/val). The temporal and spatial patterns of surface albedo variations can be retrieved from satellite observations after a series of processes, including atmospheric correction to surface spectral Bidirectional Reflectance Factor (BRF), and Bidirectional Reflectance Distribution Function (BRDF) modelling. The processing chain for deriving surface albedo introduces cumulative errors that can affect the accuracy of the retrieved satellite albedo products (MISR, MODIS, VEGETATION, and Proba-V). A new method is proposed to estimate Directional Hemispherical Reflectance (DHR) and Bi-Hemispherical Reflectance (BHR) from measured variables (downwelling, upwelling, and diffuse shortwave radiation) at 19 tower sites from the FLUXNET network, Surface Radiation Budget Network (SURFRAD), and Baseline Surface Radiation Network (BSRN) networks. The pixel-to-pixel comparison between DHR/BHR retrieved from coarse-resolution satellite observations and upscaled from tower sites from 2012 to 2016 emphasizes the parameters involved (land cover type, heterogeneity level, and instantaneous vs. time composite retrievals) [1]. Global warming effects pose a significant change in the albedo of the boreal forest areas as revealed by observed trends in AVHRR satellite albedo magnitude before and after the snow/ice melt season between 40 • N and 80 • N from 1982 to 2015. Absolute change is 4.4 albedo percentage units per 34 years. The largest changes in pre-melt-season albedo are concentrated in boreal forest, rather than tundra, and are consistent over large areas. The mean of absolute change of start date of the melt season is 11.2 days per 34 years, ... |
author2 |
Centre d'études spatiales de la biosphère (CESBIO) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) University of Maryland College Park University of Maryland System Wuhan University China |
format |
Article in Journal/Newspaper |
author |
Roujean, Jean-Louis Liang, Shunlin He, Tao |
author_facet |
Roujean, Jean-Louis Liang, Shunlin He, Tao |
author_sort |
Roujean, Jean-Louis |
title |
Editorial for Special Issue: “Remotely Sensed Albedo” |
title_short |
Editorial for Special Issue: “Remotely Sensed Albedo” |
title_full |
Editorial for Special Issue: “Remotely Sensed Albedo” |
title_fullStr |
Editorial for Special Issue: “Remotely Sensed Albedo” |
title_full_unstemmed |
Editorial for Special Issue: “Remotely Sensed Albedo” |
title_sort |
editorial for special issue: “remotely sensed albedo” |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://hal.science/hal-02354398 https://hal.science/hal-02354398/document https://hal.science/hal-02354398/file/remotesensing-11-01941.pdf https://doi.org/10.3390/rs11161941 |
genre |
Tundra |
genre_facet |
Tundra |
op_source |
ISSN: 2072-4292 Remote Sensing https://hal.science/hal-02354398 Remote Sensing, 2019, 11 (16), pp.1941. ⟨10.3390/rs11161941⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3390/rs11161941 hal-02354398 https://hal.science/hal-02354398 https://hal.science/hal-02354398/document https://hal.science/hal-02354398/file/remotesensing-11-01941.pdf doi:10.3390/rs11161941 |
op_rights |
http://creativecommons.org/licenses/by-nd/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.3390/rs11161941 |
container_title |
Remote Sensing |
container_volume |
11 |
container_issue |
16 |
container_start_page |
1941 |
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1810484232270643200 |
spelling |
ftutoulouse3hal:oai:HAL:hal-02354398v1 2024-09-15T18:39:53+00:00 Editorial for Special Issue: “Remotely Sensed Albedo” Roujean, Jean-Louis Liang, Shunlin He, Tao Centre d'études spatiales de la biosphère (CESBIO) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) University of Maryland College Park University of Maryland System Wuhan University China 2019-08 https://hal.science/hal-02354398 https://hal.science/hal-02354398/document https://hal.science/hal-02354398/file/remotesensing-11-01941.pdf https://doi.org/10.3390/rs11161941 en eng HAL CCSD MDPI info:eu-repo/semantics/altIdentifier/doi/10.3390/rs11161941 hal-02354398 https://hal.science/hal-02354398 https://hal.science/hal-02354398/document https://hal.science/hal-02354398/file/remotesensing-11-01941.pdf doi:10.3390/rs11161941 http://creativecommons.org/licenses/by-nd/ info:eu-repo/semantics/OpenAccess ISSN: 2072-4292 Remote Sensing https://hal.science/hal-02354398 Remote Sensing, 2019, 11 (16), pp.1941. ⟨10.3390/rs11161941⟩ [SDU]Sciences of the Universe [physics] [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2019 ftutoulouse3hal https://doi.org/10.3390/rs11161941 2024-06-25T00:13:50Z International audience Land surface (bare soil, vegetation, and snow) albedo is an essential climate variable that affects the Earth's radiation budget, and therefore, is of vital interest for a broad number of applications: Thematic (urban, cryosphere, land cover, and bare soil), climate (Long Term Data Record), processing technics (gap filling, data merging), and products validation (cal/val). The temporal and spatial patterns of surface albedo variations can be retrieved from satellite observations after a series of processes, including atmospheric correction to surface spectral Bidirectional Reflectance Factor (BRF), and Bidirectional Reflectance Distribution Function (BRDF) modelling. The processing chain for deriving surface albedo introduces cumulative errors that can affect the accuracy of the retrieved satellite albedo products (MISR, MODIS, VEGETATION, and Proba-V). A new method is proposed to estimate Directional Hemispherical Reflectance (DHR) and Bi-Hemispherical Reflectance (BHR) from measured variables (downwelling, upwelling, and diffuse shortwave radiation) at 19 tower sites from the FLUXNET network, Surface Radiation Budget Network (SURFRAD), and Baseline Surface Radiation Network (BSRN) networks. The pixel-to-pixel comparison between DHR/BHR retrieved from coarse-resolution satellite observations and upscaled from tower sites from 2012 to 2016 emphasizes the parameters involved (land cover type, heterogeneity level, and instantaneous vs. time composite retrievals) [1]. Global warming effects pose a significant change in the albedo of the boreal forest areas as revealed by observed trends in AVHRR satellite albedo magnitude before and after the snow/ice melt season between 40 • N and 80 • N from 1982 to 2015. Absolute change is 4.4 albedo percentage units per 34 years. The largest changes in pre-melt-season albedo are concentrated in boreal forest, rather than tundra, and are consistent over large areas. The mean of absolute change of start date of the melt season is 11.2 days per 34 years, ... Article in Journal/Newspaper Tundra Université Toulouse III - Paul Sabatier: HAL-UPS Remote Sensing 11 16 1941 |