Multi-frequency radar remote sensing of sea ice. Modelling and interpretation of polarimetric multi-frequency radar signatures of sea ice
This thesis deals with polarimetric multi-frequency radar signatures of sea ice. It presents a thorough background on the topic and three case studies. The first study presents a global sensitivity analysis of the fully polarimetric radar backscatter response from snow covered sea ice. The analysis...
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UiT Norges arktiske universitet
2018
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ftunivtroemsoe:oai:munin.uit.no:10037/13373 2023-05-15T18:17:29+02:00 Multi-frequency radar remote sensing of sea ice. Modelling and interpretation of polarimetric multi-frequency radar signatures of sea ice Grahn, Jakob 2018-06-08 https://hdl.handle.net/10037/13373 eng eng UiT Norges arktiske universitet UiT The Arctic University of Norway 978-82-8236-302-0 (trykt) og 978-82-8236-303-7 (pdf) https://hdl.handle.net/10037/13373 openAccess Copyright 2018 The Author(s) VDP::Mathematics and natural science: 400::Physics: 430::Electromagnetism acoustics optics: 434 VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Elektromagnetisme akustikk optikk: 434 VDP::Mathematics and natural science: 400::Information and communication science: 420::Simulation visualization signal processing image processing: 429 VDP::Matematikk og Naturvitenskap: 400::Informasjons- og kommunikasjonsvitenskap: 420::Simulering visualisering signalbehandling bildeanalyse: 429 DOKTOR-004 Doctoral thesis Doktorgradsavhandling 2018 ftunivtroemsoe 2021-06-25T17:56:00Z This thesis deals with polarimetric multi-frequency radar signatures of sea ice. It presents a thorough background on the topic and three case studies. The first study presents a global sensitivity analysis of the fully polarimetric radar backscatter response from snow covered sea ice. The analysis is global in the sense that it takes into account the observed ranges of sea ice properties that are needed as input, and it attributes a quantitative sensitivity measure to each individual input parameter, such that the most influential one(s) can be identified. Generally it can be concluded that parameters describing roughness of interfaces and dimensions of brine inclusions and snow grains, are more important than parameters describing bulk properties such as salinity, temperature and density. The second study complements the sensitivity analysis by showing that the considered backscatter model compare well to SAR data at both C- and L-band, for ice identified as lead ice and ice floes (which presumably is first year ice). Generally, C-band data compare better than L-band data. Likewise, the ice identified as ice floes is better represented than ice types identified as lead ice. The model primarily deviates from the data in the co-polarised phase difference and the cross-polarised channel. The third study focuses on the backscatter from frazil and grease ice. A model for the dispersion relation of gravity waves in viscous ice slicks is considered and linked to a band ratio. This ratio provides the backscatter relative to a reference radar frequency and can readily be compared to data. The analysis concludes that under certain conditions, ice slicks have strong impact on the spectral behaviour of the radar backscatter. According to the numerical simulation, the damping due to ice slicks is strong at wavelengths relevant to radar remote sensing. Doctoral or Postdoctoral Thesis Sea ice University of Tromsø: Munin Open Research Archive |
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Open Polar |
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University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Mathematics and natural science: 400::Physics: 430::Electromagnetism acoustics optics: 434 VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Elektromagnetisme akustikk optikk: 434 VDP::Mathematics and natural science: 400::Information and communication science: 420::Simulation visualization signal processing image processing: 429 VDP::Matematikk og Naturvitenskap: 400::Informasjons- og kommunikasjonsvitenskap: 420::Simulering visualisering signalbehandling bildeanalyse: 429 DOKTOR-004 |
spellingShingle |
VDP::Mathematics and natural science: 400::Physics: 430::Electromagnetism acoustics optics: 434 VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Elektromagnetisme akustikk optikk: 434 VDP::Mathematics and natural science: 400::Information and communication science: 420::Simulation visualization signal processing image processing: 429 VDP::Matematikk og Naturvitenskap: 400::Informasjons- og kommunikasjonsvitenskap: 420::Simulering visualisering signalbehandling bildeanalyse: 429 DOKTOR-004 Grahn, Jakob Multi-frequency radar remote sensing of sea ice. Modelling and interpretation of polarimetric multi-frequency radar signatures of sea ice |
topic_facet |
VDP::Mathematics and natural science: 400::Physics: 430::Electromagnetism acoustics optics: 434 VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Elektromagnetisme akustikk optikk: 434 VDP::Mathematics and natural science: 400::Information and communication science: 420::Simulation visualization signal processing image processing: 429 VDP::Matematikk og Naturvitenskap: 400::Informasjons- og kommunikasjonsvitenskap: 420::Simulering visualisering signalbehandling bildeanalyse: 429 DOKTOR-004 |
description |
This thesis deals with polarimetric multi-frequency radar signatures of sea ice. It presents a thorough background on the topic and three case studies. The first study presents a global sensitivity analysis of the fully polarimetric radar backscatter response from snow covered sea ice. The analysis is global in the sense that it takes into account the observed ranges of sea ice properties that are needed as input, and it attributes a quantitative sensitivity measure to each individual input parameter, such that the most influential one(s) can be identified. Generally it can be concluded that parameters describing roughness of interfaces and dimensions of brine inclusions and snow grains, are more important than parameters describing bulk properties such as salinity, temperature and density. The second study complements the sensitivity analysis by showing that the considered backscatter model compare well to SAR data at both C- and L-band, for ice identified as lead ice and ice floes (which presumably is first year ice). Generally, C-band data compare better than L-band data. Likewise, the ice identified as ice floes is better represented than ice types identified as lead ice. The model primarily deviates from the data in the co-polarised phase difference and the cross-polarised channel. The third study focuses on the backscatter from frazil and grease ice. A model for the dispersion relation of gravity waves in viscous ice slicks is considered and linked to a band ratio. This ratio provides the backscatter relative to a reference radar frequency and can readily be compared to data. The analysis concludes that under certain conditions, ice slicks have strong impact on the spectral behaviour of the radar backscatter. According to the numerical simulation, the damping due to ice slicks is strong at wavelengths relevant to radar remote sensing. |
format |
Doctoral or Postdoctoral Thesis |
author |
Grahn, Jakob |
author_facet |
Grahn, Jakob |
author_sort |
Grahn, Jakob |
title |
Multi-frequency radar remote sensing of sea ice. Modelling and interpretation of polarimetric multi-frequency radar signatures of sea ice |
title_short |
Multi-frequency radar remote sensing of sea ice. Modelling and interpretation of polarimetric multi-frequency radar signatures of sea ice |
title_full |
Multi-frequency radar remote sensing of sea ice. Modelling and interpretation of polarimetric multi-frequency radar signatures of sea ice |
title_fullStr |
Multi-frequency radar remote sensing of sea ice. Modelling and interpretation of polarimetric multi-frequency radar signatures of sea ice |
title_full_unstemmed |
Multi-frequency radar remote sensing of sea ice. Modelling and interpretation of polarimetric multi-frequency radar signatures of sea ice |
title_sort |
multi-frequency radar remote sensing of sea ice. modelling and interpretation of polarimetric multi-frequency radar signatures of sea ice |
publisher |
UiT Norges arktiske universitet |
publishDate |
2018 |
url |
https://hdl.handle.net/10037/13373 |
genre |
Sea ice |
genre_facet |
Sea ice |
op_relation |
978-82-8236-302-0 (trykt) og 978-82-8236-303-7 (pdf) https://hdl.handle.net/10037/13373 |
op_rights |
openAccess Copyright 2018 The Author(s) |
_version_ |
1766191723497652224 |