The Surface Albedo of the Arctic from Spaceborne Optical Imagers: Retrieval and Validation
The topic of this dissertation is the study of Arctic snow and ice albedo based on satellite observations. Surface albedo timeseries based on data from the AVHRR instrument family were produced, validated, and analyzed as part of the work. Of note was the production of a 28-year (1982-2009) dataset...
Published in: | Remote Sensing of Environment |
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Other Authors: | , , , , , , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
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Finnish Meteorological Institute
2013
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Online Access: | https://aaltodoc.aalto.fi/handle/123456789/12620 |
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Aalto University Publication Archive (Aaltodoc) |
op_collection_id |
ftaaltouniv |
language |
English |
topic |
Space technology Environmental science glaciers albedo snow sea ice remote sensing snow physics jäätiköt lumi merijää kaukokartoitus lumen ja jään fysiikka |
spellingShingle |
Space technology Environmental science glaciers albedo snow sea ice remote sensing snow physics jäätiköt lumi merijää kaukokartoitus lumen ja jään fysiikka Riihelä, Aku The Surface Albedo of the Arctic from Spaceborne Optical Imagers: Retrieval and Validation |
topic_facet |
Space technology Environmental science glaciers albedo snow sea ice remote sensing snow physics jäätiköt lumi merijää kaukokartoitus lumen ja jään fysiikka |
description |
The topic of this dissertation is the study of Arctic snow and ice albedo based on satellite observations. Surface albedo timeseries based on data from the AVHRR instrument family were produced, validated, and analyzed as part of the work. Of note was the production of a 28-year (1982-2009) dataset on global surface albedo from homogenized satellite data, the longest such timeseries to date.In conjunction with the dataset validation, new methods were developed to improve the reliability of the calculated dataset quality estimate. Specifically, a new method for numerically assessing the representativeness of ground truth observations at the scale of the satellite field of view was introduced. The final part of this dissertation deals with the application of the 28-year surface albedo dataset in the calculation of sea ice albedo trends over the Arctic Ocean. The results showed a clear negative trend in both the mean composite open water-sea ice albedo and the mean albedo of the remaining sea ice zone. This decrease was linked to decreasing ice concentrations across the ice zone, increased air temperatures and lengthened melt seasons. The results are significant for investigations of the surface energy budget of the Arctic. The results of this dissertation are of use in the development and validation work of both satellite-based surface albedo datasets and climate models. The created datasets are also useful in observation-based tracking of climate change in the Arctic. Väitöskirjassa tutkittiin Arktisen lumen ja jään heijastavuuden eli albedon määrittämistä satelliittihavainnoista. Työssä on tuotettu AVHRR-radiometrien mittauksiin perustuvia aikasarjoja sekä operatiiviseen käyttöön että ilmastonmuutostutkimukseen. Aikasarjojen laatu on selvitetty maan pinnan referenssimittauksiin verraten. Työssä on myös kehitetty menetelmiä parantamaan aikasarjoille laskettujen laatuarvioiden luotettavuutta. Maan pinnan referenssimittausten vertautuvuutta satelliittimittauksiin voidaan työn tulosten perusteella arvioida entistä ... |
author2 |
Sähkötekniikan korkeakoulu School of Electrical Engineering Radiotieteen ja -tekniikan laitos Department of Radio Science and Engineering Hallikainen, Martti, Prof., Aalto University, Department of Radio Science and Engineering, Finland Aalto-yliopisto Aalto University |
format |
Doctoral or Postdoctoral Thesis |
author |
Riihelä, Aku |
author_facet |
Riihelä, Aku |
author_sort |
Riihelä, Aku |
title |
The Surface Albedo of the Arctic from Spaceborne Optical Imagers: Retrieval and Validation |
title_short |
The Surface Albedo of the Arctic from Spaceborne Optical Imagers: Retrieval and Validation |
title_full |
The Surface Albedo of the Arctic from Spaceborne Optical Imagers: Retrieval and Validation |
title_fullStr |
The Surface Albedo of the Arctic from Spaceborne Optical Imagers: Retrieval and Validation |
title_full_unstemmed |
The Surface Albedo of the Arctic from Spaceborne Optical Imagers: Retrieval and Validation |
title_sort |
surface albedo of the arctic from spaceborne optical imagers: retrieval and validation |
publisher |
Finnish Meteorological Institute |
publishDate |
2013 |
url |
https://aaltodoc.aalto.fi/handle/123456789/12620 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
albedo Arctic Arctic Arctic Ocean Arktis* Climate change Sea ice |
genre_facet |
albedo Arctic Arctic Arctic Ocean Arktis* Climate change Sea ice |
op_relation |
Finnish Meteorological Institute Contributions 101 [Publication 1]: Aku Riihelä, Vesa Laine, Terhikki Manninen, Timo Palo, and Timo Vihma. 2010. Validation of the Climate-SAF surface broadband albedo product: Comparisons with in situ observations over Greenland and the ice-covered Arctic Ocean. Remote Sensing of Environment, volume 114, number 11, pages 2779-2790. doi:10.1016/j.rse.2010.06.014. [Publication 2]: A. Riihelä, T. Manninen, V. Laine, K. Andersson, and F. Kaspar. 2013. CLARA-SAL: a global 28 yr timeseries of Earth's black-sky surface albedo. Atmospheric Chemistry and Physics, volume 13, number 7, pages 3743-3762. doi:10.5194/acp-13-3743-2013. [Publication 3]: Aku Riihelä and Terhikki Manninen. 2008. Measuring the vertical albedo profile of a subarctic boreal forest canopy. Silva Fennica, volume 42, number 5, pages 807-815. [Publication 4]: T. Manninen, A. Riihelä, and G. de Leeuw. 2012. Atmospheric effect on the ground-based measurements of broadband surface albedo. Atmospheric Measurement Techniques, volume 5, number 11, pages 2675-2688. doi:10.5194/amt-5-2675-2012. [Publication 5]: Aku Riihelä, Terhikki Manninen, and Vesa Laine. 2013. Observed changes in the albedo of the Arctic sea-ice zone for the period 1982-2009. Nature Climate Change, volume 3, number 10, pages 895-898. doi:10.1038/nclimate1963. 978-951-697-800-3 (electronic) 978-951-697-799-0 (printed) 0782-6117 (printed) https://aaltodoc.aalto.fi/handle/123456789/12620 URN:ISBN:978-951-697-800-3 |
op_doi |
https://doi.org/10.1016/j.rse.2010.06.014 https://doi.org/10.5194/acp-13-3743-2013 https://doi.org/10.5194/amt-5-2675-2012 https://doi.org/10.1038/nclimate1963 |
container_title |
Remote Sensing of Environment |
container_volume |
114 |
container_issue |
11 |
container_start_page |
2779 |
op_container_end_page |
2790 |
_version_ |
1766228990309171200 |
spelling |
ftaaltouniv:oai:aaltodoc.aalto.fi:123456789/12620 2023-05-15T13:10:25+02:00 The Surface Albedo of the Arctic from Spaceborne Optical Imagers: Retrieval and Validation Arktisen alueen heijastavuuden määritys optisen alueen satelliitti-instrumenttien mittauksista ja tulosten varmentaminen Riihelä, Aku Sähkötekniikan korkeakoulu School of Electrical Engineering Radiotieteen ja -tekniikan laitos Department of Radio Science and Engineering Hallikainen, Martti, Prof., Aalto University, Department of Radio Science and Engineering, Finland Aalto-yliopisto Aalto University 2013 application/pdf https://aaltodoc.aalto.fi/handle/123456789/12620 en eng Finnish Meteorological Institute Ilmatieteen laitos Finnish Meteorological Institute Contributions 101 [Publication 1]: Aku Riihelä, Vesa Laine, Terhikki Manninen, Timo Palo, and Timo Vihma. 2010. Validation of the Climate-SAF surface broadband albedo product: Comparisons with in situ observations over Greenland and the ice-covered Arctic Ocean. Remote Sensing of Environment, volume 114, number 11, pages 2779-2790. doi:10.1016/j.rse.2010.06.014. [Publication 2]: A. Riihelä, T. Manninen, V. Laine, K. Andersson, and F. Kaspar. 2013. CLARA-SAL: a global 28 yr timeseries of Earth's black-sky surface albedo. Atmospheric Chemistry and Physics, volume 13, number 7, pages 3743-3762. doi:10.5194/acp-13-3743-2013. [Publication 3]: Aku Riihelä and Terhikki Manninen. 2008. Measuring the vertical albedo profile of a subarctic boreal forest canopy. Silva Fennica, volume 42, number 5, pages 807-815. [Publication 4]: T. Manninen, A. Riihelä, and G. de Leeuw. 2012. Atmospheric effect on the ground-based measurements of broadband surface albedo. Atmospheric Measurement Techniques, volume 5, number 11, pages 2675-2688. doi:10.5194/amt-5-2675-2012. [Publication 5]: Aku Riihelä, Terhikki Manninen, and Vesa Laine. 2013. Observed changes in the albedo of the Arctic sea-ice zone for the period 1982-2009. Nature Climate Change, volume 3, number 10, pages 895-898. doi:10.1038/nclimate1963. 978-951-697-800-3 (electronic) 978-951-697-799-0 (printed) 0782-6117 (printed) https://aaltodoc.aalto.fi/handle/123456789/12620 URN:ISBN:978-951-697-800-3 Space technology Environmental science glaciers albedo snow sea ice remote sensing snow physics jäätiköt lumi merijää kaukokartoitus lumen ja jään fysiikka G5 Artikkeliväitöskirja text Doctoral dissertation (article-based) Väitöskirja (artikkeli) 2013 ftaaltouniv https://doi.org/10.1016/j.rse.2010.06.014 https://doi.org/10.5194/acp-13-3743-2013 https://doi.org/10.5194/amt-5-2675-2012 https://doi.org/10.1038/nclimate1963 2022-12-15T19:13:32Z The topic of this dissertation is the study of Arctic snow and ice albedo based on satellite observations. Surface albedo timeseries based on data from the AVHRR instrument family were produced, validated, and analyzed as part of the work. Of note was the production of a 28-year (1982-2009) dataset on global surface albedo from homogenized satellite data, the longest such timeseries to date.In conjunction with the dataset validation, new methods were developed to improve the reliability of the calculated dataset quality estimate. Specifically, a new method for numerically assessing the representativeness of ground truth observations at the scale of the satellite field of view was introduced. The final part of this dissertation deals with the application of the 28-year surface albedo dataset in the calculation of sea ice albedo trends over the Arctic Ocean. The results showed a clear negative trend in both the mean composite open water-sea ice albedo and the mean albedo of the remaining sea ice zone. This decrease was linked to decreasing ice concentrations across the ice zone, increased air temperatures and lengthened melt seasons. The results are significant for investigations of the surface energy budget of the Arctic. The results of this dissertation are of use in the development and validation work of both satellite-based surface albedo datasets and climate models. The created datasets are also useful in observation-based tracking of climate change in the Arctic. Väitöskirjassa tutkittiin Arktisen lumen ja jään heijastavuuden eli albedon määrittämistä satelliittihavainnoista. Työssä on tuotettu AVHRR-radiometrien mittauksiin perustuvia aikasarjoja sekä operatiiviseen käyttöön että ilmastonmuutostutkimukseen. Aikasarjojen laatu on selvitetty maan pinnan referenssimittauksiin verraten. Työssä on myös kehitetty menetelmiä parantamaan aikasarjoille laskettujen laatuarvioiden luotettavuutta. Maan pinnan referenssimittausten vertautuvuutta satelliittimittauksiin voidaan työn tulosten perusteella arvioida entistä ... Doctoral or Postdoctoral Thesis albedo Arctic Arctic Arctic Ocean Arktis* Climate change Sea ice Aalto University Publication Archive (Aaltodoc) Arctic Arctic Ocean Remote Sensing of Environment 114 11 2779 2790 |