Refining the sea surface identification approach for determining freeboards in the ICESat-2 sea ice products
In Release 001 and 002 of the ICESat-2 sea ice products, candidate height segments used to estimate the reference sea surface height for freeboard calculations included two surface types: specular and smooth dark leads. We found that the uncorrected photon rates, used as proxies of surface reflectan...
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Published in | The cryosphere Vol. 15; no. 2; pp. 821 - 833 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
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Katlenburg-Lindau
Copernicus GmbH
18.02.2021
Copernicus Publications |
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Abstract | In Release 001 and 002 of the ICESat-2 sea ice products,
candidate height segments used to estimate the reference sea surface height
for freeboard calculations included two surface types: specular and smooth
dark leads. We found that the uncorrected photon rates, used as proxies of
surface reflectance, are attenuated due to clouds resulting in the potential
misclassification of sea ice as dark leads, biasing the reference sea
surface height relative to those derived from the more reliable specular
returns. This results in higher reference sea surface heights and lower
estimated ice freeboards. The resolution of available cloud flags from the
ICESat-2 atmosphere data product is too coarse to provide useful filtering
at the lead segment scale. In Release 003, we have modified the surface-reference-finding algorithm so that only specular leads are used. The
consequence of this change can be seen in the composites of mean freeboard
of the Arctic and Southern oceans. Broadly, coverages have decreased by
∼10–20 % because there are fewer leads (by excluding the
dark leads), and the composite means have increased by 0–4 cm because of the
use of more consistent specular leads. |
---|---|
AbstractList | In Release 001 and 002 of the ICESat-2 sea ice products, candidate height segments used to estimate the reference sea surface height for freeboard calculations included two surface types: specular and smooth dark leads. We found that the uncorrected photon rates, used as proxies of surface reflectance, are attenuated due to clouds resulting in the potential misclassification of sea ice as dark leads, biasing the reference sea surface height relative to those derived from the more reliable specular returns. This results in higher reference sea surface heights and lower estimated ice freeboards. The resolution of available cloud flags from the ICESat-2 atmosphere data product is too coarse to provide useful filtering at the lead segment scale. In Release 003, we have modified the surface-reference-finding algorithm so that only specular leads are used. The consequence of this change can be seen in the composites of mean freeboard of the Arctic and Southern oceans. Broadly, coverages have decreased by ∼10 –20 % because there are fewer leads (by excluding the dark leads), and the composite means have increased by 0–4 cm because of the use of more consistent specular leads. In Release 001 and 002 of the ICESat-2 sea ice products, candidate height segments used to estimate the reference sea surface height for freeboard calculations included two surface types: specular and smooth dark leads. We found that the uncorrected photon rates, used as proxies of surface reflectance, are attenuated due to clouds resulting in the potential misclassification of sea ice as dark leads, biasing the reference sea surface height relative to those derived from the more reliable specular returns. This results in higher reference sea surface heights and lower estimated ice freeboards. The resolution of available cloud flags from the ICESat-2 atmosphere data product is too coarse to provide useful filtering at the lead segment scale. In Release 003, we have modified the surface-reference-finding algorithm so that only specular leads are used. The consequence of this change can be seen in the composites of mean freeboard of the Arctic and Southern oceans. Broadly, coverages have decreased by â¼10-20 % because there are fewer leads (by excluding the dark leads), and the composite means have increased by 0-4 cm because of the use of more consistent specular leads. In Release 001 and 002 of the ICESat-2 sea ice products, candidate height segments used to estimate the reference sea surface height for freeboard calculations included two surface types: specular and smooth dark leads. We found that the uncorrected photon rates, used as proxies of surface reflectance, are attenuated due to clouds resulting in the potential misclassification of sea ice as dark leads, biasing the reference sea surface height relative to those derived from the more reliable specular returns. This results in higher reference sea surface heights and lower estimated ice freeboards. The resolution of available cloud flags from the ICESat-2 atmosphere data product is too coarse to provide useful filtering at the lead segment scale. In Release 003, we have modified the surface-reference-finding algorithm so that only specular leads are used. The consequence of this change can be seen in the composites of mean freeboard of the Arctic and Southern oceans. Broadly, coverages have decreased by ∼10–20 % because there are fewer leads (by excluding the dark leads), and the composite means have increased by 0–4 cm because of the use of more consistent specular leads. In Release 001 and 002 of the ICESat-2 sea ice products, candidate height segments used to estimate the reference sea surface height for freeboard calculations included two surface types: specular and smooth dark leads. We found that the uncorrected photon rates, used as proxies of surface reflectance, are attenuated due to clouds resulting in the potential misclassification of sea ice as dark leads, biasing the reference sea surface height relative to those derived from the more reliable specular returns. This results in higher reference sea surface heights and lower estimated ice freeboards. The resolution of available cloud flags from the ICESat-2 atmosphere data product is too coarse to provide useful filtering at the lead segment scale. In Release 003, we have modified the surface-reference-finding algorithm so that only specular leads are used. The consequence of this change can be seen in the composites of mean freeboard of the Arctic and Southern oceans. Broadly, coverages have decreased by∼10–20 % because there are fewer leads (by excluding the dark leads), and the composite means have increased by 0–4 cm because of the use of more consistent specular leads. |
Audience | Academic |
Author | Kurtz, Nathan T Kacimi, Sahra Cunningham, Glenn F Bagnardi, Marco Petty, Alek A Ivanoff, Alvaro Kwok, Ron |
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Cites_doi | 10.1029/2008JC005074 10.1175/JTECH-D-13-00120.1 10.1029/2019JC016008 10.5194/tc-7-1035-2013 10.1016/j.rse.2016.12.029 10.1016/S0264-3707(02)00042-X 10.3189/172756411795931480 10.1029/2006JC003978 10.1029/2011JC007654 10.1029/2019GL084976 10.1016/j.rse.2019.111325 10.1029/2019JC015764 10.1016/j.rse.2016.05.011 |
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Snippet | In Release 001 and 002 of the ICESat-2 sea ice products,
candidate height segments used to estimate the reference sea surface height
for freeboard calculations... In Release 001 and 002 of the ICESat-2 sea ice products, candidate height segments used to estimate the reference sea surface height for freeboard calculations... In Release 001 and 002 of the ICESat-2 sea ice products, candidate height segments used to estimate the reference sea surface height for freeboard calculations... |
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SubjectTerms | Algorithms Atmospheric data Clouds Computer centers Digital cameras Estimates Freeboard Oceans Polar environments Reflectance Sea ice Sea level Sea surface Segments Topography |
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Title | Refining the sea surface identification approach for determining freeboards in the ICESat-2 sea ice products |
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