Polar firn layering in radiative transfer models
For many applications in the geosciences, remote sensing is the only feasible method of obtaining data from large areas with limited accessibility. This is especially true for the cryosphere, where light conditions and cloud coverage additionally limit the use of optical sensors. Here, instruments o...
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ftawi:oai:epic.awi.de:40748 2024-09-15T17:47:05+00:00 Polar firn layering in radiative transfer models Linow, Stefanie Hoerhold, Maria 2016-04-21 https://epic.awi.de/id/eprint/40748/ https://hdl.handle.net/10013/epic.47784 unknown Linow, S. and Hoerhold, M. (2016) Polar firn layering in radiative transfer models , EGU General Assembly 2016, Vienna, 17 April 2016 - 22 March 2016 . hdl:10013/epic.47784 EPIC3EGU General Assembly 2016, Vienna, 2016-04-17-2016-03-22 Conference notRev 2016 ftawi 2024-06-24T04:14:20Z For many applications in the geosciences, remote sensing is the only feasible method of obtaining data from large areas with limited accessibility. This is especially true for the cryosphere, where light conditions and cloud coverage additionally limit the use of optical sensors. Here, instruments operating at microwave frequencies become important, for instance in polar snow parameters / SWE (snow water equivalent) mapping. However, the interaction between snow and microwave radiation is a complex process and still not fully understood. RT (radiative transfer) models to simulate snow-microwave interaction are available, but they require a number of input parameters such as microstructure and density, which are partly ill-constrained. The layering of snow and firn introduces an additional degree of complexity, as all snow parameters show a strong variability with depth. Many studies on RT modeling of polar firn deal with layer variability by using statistical properties derived from previous measurements, such as the standard deviations of density and microstructure, to configure model input. Here, the variability of microstructure parameters, such as density and particle size, are usually assumed to be independent of each other. However, in the case of the firn pack of the polar ice sheets, we observe that microstructure evolution depends on environmental parameters, such as temperature and snow deposition. Accordingly, density and microstructure evolve together within the snow and firn. Based on CT (computer tomography) microstructure measurements of antarctic firn, we can show that: first, the variability of density and effective grain size are linked and can thus be implemented in the RT models as a coupled set of parameters. Second, the magnitude of layering is captured by the measured standard deviation. Based on high-resolution density measurements of an Antarctic firn core, we study the effect of firn layering at different microwave wavelengths. By means of a sensitivity study we explore both the linked ... Conference Object Antarc* Antarctic Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
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description |
For many applications in the geosciences, remote sensing is the only feasible method of obtaining data from large areas with limited accessibility. This is especially true for the cryosphere, where light conditions and cloud coverage additionally limit the use of optical sensors. Here, instruments operating at microwave frequencies become important, for instance in polar snow parameters / SWE (snow water equivalent) mapping. However, the interaction between snow and microwave radiation is a complex process and still not fully understood. RT (radiative transfer) models to simulate snow-microwave interaction are available, but they require a number of input parameters such as microstructure and density, which are partly ill-constrained. The layering of snow and firn introduces an additional degree of complexity, as all snow parameters show a strong variability with depth. Many studies on RT modeling of polar firn deal with layer variability by using statistical properties derived from previous measurements, such as the standard deviations of density and microstructure, to configure model input. Here, the variability of microstructure parameters, such as density and particle size, are usually assumed to be independent of each other. However, in the case of the firn pack of the polar ice sheets, we observe that microstructure evolution depends on environmental parameters, such as temperature and snow deposition. Accordingly, density and microstructure evolve together within the snow and firn. Based on CT (computer tomography) microstructure measurements of antarctic firn, we can show that: first, the variability of density and effective grain size are linked and can thus be implemented in the RT models as a coupled set of parameters. Second, the magnitude of layering is captured by the measured standard deviation. Based on high-resolution density measurements of an Antarctic firn core, we study the effect of firn layering at different microwave wavelengths. By means of a sensitivity study we explore both the linked ... |
format |
Conference Object |
author |
Linow, Stefanie Hoerhold, Maria |
spellingShingle |
Linow, Stefanie Hoerhold, Maria Polar firn layering in radiative transfer models |
author_facet |
Linow, Stefanie Hoerhold, Maria |
author_sort |
Linow, Stefanie |
title |
Polar firn layering in radiative transfer models |
title_short |
Polar firn layering in radiative transfer models |
title_full |
Polar firn layering in radiative transfer models |
title_fullStr |
Polar firn layering in radiative transfer models |
title_full_unstemmed |
Polar firn layering in radiative transfer models |
title_sort |
polar firn layering in radiative transfer models |
publishDate |
2016 |
url |
https://epic.awi.de/id/eprint/40748/ https://hdl.handle.net/10013/epic.47784 |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
EPIC3EGU General Assembly 2016, Vienna, 2016-04-17-2016-03-22 |
op_relation |
Linow, S. and Hoerhold, M. (2016) Polar firn layering in radiative transfer models , EGU General Assembly 2016, Vienna, 17 April 2016 - 22 March 2016 . hdl:10013/epic.47784 |
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1810495675383676928 |