SURFACE SNOW DENSITY OF EAST ANTARCTICA DERIVED FROM IN-SITU OBSERVATIONS
Models based on physical principles or semi-empirical parameterizations have used to compute the firn density, which is essential for the study of surface processes in the Antarctic ice sheet. However, parameterization of surface snow density is often challenged by the description of detailed local...
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Online Access: | https://doi.org/10.5194/isprs-archives-XLII-3-1657-2018 https://doaj.org/article/4ba0362d5a8848549a318f75cb8e8a47 |
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ftdoajarticles:oai:doaj.org/article:4ba0362d5a8848549a318f75cb8e8a47 2023-05-15T13:54:42+02:00 SURFACE SNOW DENSITY OF EAST ANTARCTICA DERIVED FROM IN-SITU OBSERVATIONS Y. Tian S. Zhang W. Du J. Chen H. Xie X. Tong R. Li 2018-04-01T00:00:00Z https://doi.org/10.5194/isprs-archives-XLII-3-1657-2018 https://doaj.org/article/4ba0362d5a8848549a318f75cb8e8a47 EN eng Copernicus Publications https://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XLII-3/1657/2018/isprs-archives-XLII-3-1657-2018.pdf https://doaj.org/toc/1682-1750 https://doaj.org/toc/2194-9034 doi:10.5194/isprs-archives-XLII-3-1657-2018 1682-1750 2194-9034 https://doaj.org/article/4ba0362d5a8848549a318f75cb8e8a47 The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XLII-3, Pp 1657-1660 (2018) Technology T Engineering (General). Civil engineering (General) TA1-2040 Applied optics. Photonics TA1501-1820 article 2018 ftdoajarticles https://doi.org/10.5194/isprs-archives-XLII-3-1657-2018 2022-12-31T15:02:38Z Models based on physical principles or semi-empirical parameterizations have used to compute the firn density, which is essential for the study of surface processes in the Antarctic ice sheet. However, parameterization of surface snow density is often challenged by the description of detailed local characterization. In this study we propose to generate a surface density map for East Antarctica from all the filed observations that are available. Considering that the observations are non-uniformly distributed around East Antarctica, obtained by different methods, and temporally inhomogeneous, the field observations are used to establish an initial density map with a grid size of 30 × 30 km 2 in which the observations are averaged at a temporal scale of five years. We then construct an observation matrix with its columns as the map grids and rows as the temporal scale. If a site has an unknown density value for a period, we will set it to 0 in the matrix. In order to construct the main spatial and temple information of surface snow density matrix we adopt Empirical Orthogonal Function (EOF) method to decompose the observation matrix and only take first several lower-order modes, because these modes already contain most information of the observation matrix. However, there are a lot of zeros in the matrix and we solve it by using matrix completion algorithm, and then we derive the time series of surface snow density at each observation site. Finally, we can obtain the surface snow density by multiplying the modes interpolated by kriging with the corresponding amplitude of the modes. Comparative analysis have done between our surface snow density map and model results. The above details will be introduced in the paper. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Sheet Directory of Open Access Journals: DOAJ Articles Antarctic The Antarctic East Antarctica The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-3 1657 1660 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Technology T Engineering (General). Civil engineering (General) TA1-2040 Applied optics. Photonics TA1501-1820 |
spellingShingle |
Technology T Engineering (General). Civil engineering (General) TA1-2040 Applied optics. Photonics TA1501-1820 Y. Tian S. Zhang W. Du J. Chen H. Xie X. Tong R. Li SURFACE SNOW DENSITY OF EAST ANTARCTICA DERIVED FROM IN-SITU OBSERVATIONS |
topic_facet |
Technology T Engineering (General). Civil engineering (General) TA1-2040 Applied optics. Photonics TA1501-1820 |
description |
Models based on physical principles or semi-empirical parameterizations have used to compute the firn density, which is essential for the study of surface processes in the Antarctic ice sheet. However, parameterization of surface snow density is often challenged by the description of detailed local characterization. In this study we propose to generate a surface density map for East Antarctica from all the filed observations that are available. Considering that the observations are non-uniformly distributed around East Antarctica, obtained by different methods, and temporally inhomogeneous, the field observations are used to establish an initial density map with a grid size of 30 × 30 km 2 in which the observations are averaged at a temporal scale of five years. We then construct an observation matrix with its columns as the map grids and rows as the temporal scale. If a site has an unknown density value for a period, we will set it to 0 in the matrix. In order to construct the main spatial and temple information of surface snow density matrix we adopt Empirical Orthogonal Function (EOF) method to decompose the observation matrix and only take first several lower-order modes, because these modes already contain most information of the observation matrix. However, there are a lot of zeros in the matrix and we solve it by using matrix completion algorithm, and then we derive the time series of surface snow density at each observation site. Finally, we can obtain the surface snow density by multiplying the modes interpolated by kriging with the corresponding amplitude of the modes. Comparative analysis have done between our surface snow density map and model results. The above details will be introduced in the paper. |
format |
Article in Journal/Newspaper |
author |
Y. Tian S. Zhang W. Du J. Chen H. Xie X. Tong R. Li |
author_facet |
Y. Tian S. Zhang W. Du J. Chen H. Xie X. Tong R. Li |
author_sort |
Y. Tian |
title |
SURFACE SNOW DENSITY OF EAST ANTARCTICA DERIVED FROM IN-SITU OBSERVATIONS |
title_short |
SURFACE SNOW DENSITY OF EAST ANTARCTICA DERIVED FROM IN-SITU OBSERVATIONS |
title_full |
SURFACE SNOW DENSITY OF EAST ANTARCTICA DERIVED FROM IN-SITU OBSERVATIONS |
title_fullStr |
SURFACE SNOW DENSITY OF EAST ANTARCTICA DERIVED FROM IN-SITU OBSERVATIONS |
title_full_unstemmed |
SURFACE SNOW DENSITY OF EAST ANTARCTICA DERIVED FROM IN-SITU OBSERVATIONS |
title_sort |
surface snow density of east antarctica derived from in-situ observations |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/isprs-archives-XLII-3-1657-2018 https://doaj.org/article/4ba0362d5a8848549a318f75cb8e8a47 |
geographic |
Antarctic The Antarctic East Antarctica |
geographic_facet |
Antarctic The Antarctic East Antarctica |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet |
op_source |
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XLII-3, Pp 1657-1660 (2018) |
op_relation |
https://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XLII-3/1657/2018/isprs-archives-XLII-3-1657-2018.pdf https://doaj.org/toc/1682-1750 https://doaj.org/toc/2194-9034 doi:10.5194/isprs-archives-XLII-3-1657-2018 1682-1750 2194-9034 https://doaj.org/article/4ba0362d5a8848549a318f75cb8e8a47 |
op_doi |
https://doi.org/10.5194/isprs-archives-XLII-3-1657-2018 |
container_title |
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences |
container_volume |
XLII-3 |
container_start_page |
1657 |
op_container_end_page |
1660 |
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1766260772852203520 |