Impact of MODIS sensor calibration updates on Greenland Ice Sheet surface reflectance and albedo trends
We evaluate Greenland Ice Sheet (GrIS) surface reflectance and albedo trends using the newly released Collection 6 (C6) MODIS (Moderate Resolution Imaging Spectroradiometer) products over the period 2001–2016. We find that the correction of MODIS sensor degradation provided in the new C6 data produc...
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ftcopernicus:oai:publications.copernicus.org:tc57911 2023-05-15T16:27:11+02:00 Impact of MODIS sensor calibration updates on Greenland Ice Sheet surface reflectance and albedo trends Casey, Kimberly A. Polashenski, Chris M. Chen, Justin Tedesco, Marco 2018-09-27 application/pdf https://doi.org/10.5194/tc-11-1781-2017 https://tc.copernicus.org/articles/11/1781/2017/ eng eng doi:10.5194/tc-11-1781-2017 https://tc.copernicus.org/articles/11/1781/2017/ eISSN: 1994-0424 Text 2018 ftcopernicus https://doi.org/10.5194/tc-11-1781-2017 2020-07-20T16:23:38Z We evaluate Greenland Ice Sheet (GrIS) surface reflectance and albedo trends using the newly released Collection 6 (C6) MODIS (Moderate Resolution Imaging Spectroradiometer) products over the period 2001–2016. We find that the correction of MODIS sensor degradation provided in the new C6 data products reduces the magnitude of the surface reflectance and albedo decline trends obtained from previous MODIS data (i.e., Collection 5, C5). Collection 5 and 6 data product analysis over GrIS is characterized by surface (i.e., wet vs. dry) and elevation (i.e., 500–2000 m, 2000 m and greater) conditions over the summer season from 1 June to 31 August. Notably, the visible-wavelength declining reflectance trends identified in several bands of MODIS C5 data from previous studies are only slightly detected at reduced magnitude in the C6 versions over the dry snow area. Declining albedo in the wet snow and ice area remains over the MODIS record in the C6 product, albeit at a lower magnitude than obtained using C5 data. Further analyses of C6 spectral reflectance trends show both reflectance increases and decreases in select bands and regions, suggesting that several competing processes are contributing to Greenland Ice Sheet albedo change. Investigators using MODIS data for other ocean, atmosphere and/or land analyses are urged to consider similar re-examinations of trends previously established using C5 data. Text Greenland Ice Sheet Copernicus Publications: E-Journals Greenland The Cryosphere 11 4 1781 1795 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
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English |
description |
We evaluate Greenland Ice Sheet (GrIS) surface reflectance and albedo trends using the newly released Collection 6 (C6) MODIS (Moderate Resolution Imaging Spectroradiometer) products over the period 2001–2016. We find that the correction of MODIS sensor degradation provided in the new C6 data products reduces the magnitude of the surface reflectance and albedo decline trends obtained from previous MODIS data (i.e., Collection 5, C5). Collection 5 and 6 data product analysis over GrIS is characterized by surface (i.e., wet vs. dry) and elevation (i.e., 500–2000 m, 2000 m and greater) conditions over the summer season from 1 June to 31 August. Notably, the visible-wavelength declining reflectance trends identified in several bands of MODIS C5 data from previous studies are only slightly detected at reduced magnitude in the C6 versions over the dry snow area. Declining albedo in the wet snow and ice area remains over the MODIS record in the C6 product, albeit at a lower magnitude than obtained using C5 data. Further analyses of C6 spectral reflectance trends show both reflectance increases and decreases in select bands and regions, suggesting that several competing processes are contributing to Greenland Ice Sheet albedo change. Investigators using MODIS data for other ocean, atmosphere and/or land analyses are urged to consider similar re-examinations of trends previously established using C5 data. |
format |
Text |
author |
Casey, Kimberly A. Polashenski, Chris M. Chen, Justin Tedesco, Marco |
spellingShingle |
Casey, Kimberly A. Polashenski, Chris M. Chen, Justin Tedesco, Marco Impact of MODIS sensor calibration updates on Greenland Ice Sheet surface reflectance and albedo trends |
author_facet |
Casey, Kimberly A. Polashenski, Chris M. Chen, Justin Tedesco, Marco |
author_sort |
Casey, Kimberly A. |
title |
Impact of MODIS sensor calibration updates on Greenland Ice Sheet surface reflectance and albedo trends |
title_short |
Impact of MODIS sensor calibration updates on Greenland Ice Sheet surface reflectance and albedo trends |
title_full |
Impact of MODIS sensor calibration updates on Greenland Ice Sheet surface reflectance and albedo trends |
title_fullStr |
Impact of MODIS sensor calibration updates on Greenland Ice Sheet surface reflectance and albedo trends |
title_full_unstemmed |
Impact of MODIS sensor calibration updates on Greenland Ice Sheet surface reflectance and albedo trends |
title_sort |
impact of modis sensor calibration updates on greenland ice sheet surface reflectance and albedo trends |
publishDate |
2018 |
url |
https://doi.org/10.5194/tc-11-1781-2017 https://tc.copernicus.org/articles/11/1781/2017/ |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-11-1781-2017 https://tc.copernicus.org/articles/11/1781/2017/ |
op_doi |
https://doi.org/10.5194/tc-11-1781-2017 |
container_title |
The Cryosphere |
container_volume |
11 |
container_issue |
4 |
container_start_page |
1781 |
op_container_end_page |
1795 |
_version_ |
1766016265523036160 |