Decorrelation of GRACE Time Variable Gravity Field Solutions Using Full Covariance Information
In this study the feasibility and performance of time variable decorrelation (VADER) filters derived from covariance information on decadal Gravity Recovery and Climate Experiment (GRACE) time series are investigated. The VADER filter is based on publicly available data that are provided by several...
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ftdoajarticles:oai:doaj.org/article:daa3d0d78602468aa27cb627f5a790e8 2023-05-15T14:02:15+02:00 Decorrelation of GRACE Time Variable Gravity Field Solutions Using Full Covariance Information Alexander Horvath Michael Murböck Roland Pail Martin Horwath 2018-08-01T00:00:00Z https://doi.org/10.3390/geosciences8090323 https://doaj.org/article/daa3d0d78602468aa27cb627f5a790e8 EN eng MDPI AG http://www.mdpi.com/2076-3263/8/9/323 https://doaj.org/toc/2076-3263 2076-3263 doi:10.3390/geosciences8090323 https://doaj.org/article/daa3d0d78602468aa27cb627f5a790e8 Geosciences, Vol 8, Iss 9, p 323 (2018) GRACE gravity decorrelation filter post-processing Geology QE1-996.5 article 2018 ftdoajarticles https://doi.org/10.3390/geosciences8090323 2022-12-31T12:23:13Z In this study the feasibility and performance of time variable decorrelation (VADER) filters derived from covariance information on decadal Gravity Recovery and Climate Experiment (GRACE) time series are investigated. The VADER filter is based on publicly available data that are provided by several GRACE processing centers, and does not need its own Level-2 processing chain. Numerical closed loop simulations, incorporating stochastic and deterministic error budgets, serve as basis for the design of the filter setup, and the resulting filters are subsequently applied for real data processing. The closed loop experiments demonstrate the impact of temporally varying error and signal covariance matrices that are used for the design of decorrelation filters. The results indicate an average reduction of cumulative geoid height errors of 15% using time-variable instead of static decorrelation. Based on the simulation experience, a real data filtering procedure is designed and set up. It is applied to the ITSG-Grace2014 time variable gravity field time series with its associated full monthly covariance matrices. To assess the validity of the approach, linear mass trend estimates for the Antarctic Peninsula are computed using VADER filters and compared to previous estimates from both, GRACE and other mass balance estimation techniques. The mass change results obtained show very good agreement with other estimates and are robust against variations of the filter strength. The DDK decorrelation filter serves as main benchmark for the assessment of the VADER filter. For comparable filter strengths the VADER filters achieve a better de-striping and deliver smaller formal errors than static filters like the DDK. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Directory of Open Access Journals: DOAJ Articles Antarctic The Antarctic Antarctic Peninsula Geosciences 8 9 323 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
GRACE gravity decorrelation filter post-processing Geology QE1-996.5 |
spellingShingle |
GRACE gravity decorrelation filter post-processing Geology QE1-996.5 Alexander Horvath Michael Murböck Roland Pail Martin Horwath Decorrelation of GRACE Time Variable Gravity Field Solutions Using Full Covariance Information |
topic_facet |
GRACE gravity decorrelation filter post-processing Geology QE1-996.5 |
description |
In this study the feasibility and performance of time variable decorrelation (VADER) filters derived from covariance information on decadal Gravity Recovery and Climate Experiment (GRACE) time series are investigated. The VADER filter is based on publicly available data that are provided by several GRACE processing centers, and does not need its own Level-2 processing chain. Numerical closed loop simulations, incorporating stochastic and deterministic error budgets, serve as basis for the design of the filter setup, and the resulting filters are subsequently applied for real data processing. The closed loop experiments demonstrate the impact of temporally varying error and signal covariance matrices that are used for the design of decorrelation filters. The results indicate an average reduction of cumulative geoid height errors of 15% using time-variable instead of static decorrelation. Based on the simulation experience, a real data filtering procedure is designed and set up. It is applied to the ITSG-Grace2014 time variable gravity field time series with its associated full monthly covariance matrices. To assess the validity of the approach, linear mass trend estimates for the Antarctic Peninsula are computed using VADER filters and compared to previous estimates from both, GRACE and other mass balance estimation techniques. The mass change results obtained show very good agreement with other estimates and are robust against variations of the filter strength. The DDK decorrelation filter serves as main benchmark for the assessment of the VADER filter. For comparable filter strengths the VADER filters achieve a better de-striping and deliver smaller formal errors than static filters like the DDK. |
format |
Article in Journal/Newspaper |
author |
Alexander Horvath Michael Murböck Roland Pail Martin Horwath |
author_facet |
Alexander Horvath Michael Murböck Roland Pail Martin Horwath |
author_sort |
Alexander Horvath |
title |
Decorrelation of GRACE Time Variable Gravity Field Solutions Using Full Covariance Information |
title_short |
Decorrelation of GRACE Time Variable Gravity Field Solutions Using Full Covariance Information |
title_full |
Decorrelation of GRACE Time Variable Gravity Field Solutions Using Full Covariance Information |
title_fullStr |
Decorrelation of GRACE Time Variable Gravity Field Solutions Using Full Covariance Information |
title_full_unstemmed |
Decorrelation of GRACE Time Variable Gravity Field Solutions Using Full Covariance Information |
title_sort |
decorrelation of grace time variable gravity field solutions using full covariance information |
publisher |
MDPI AG |
publishDate |
2018 |
url |
https://doi.org/10.3390/geosciences8090323 https://doaj.org/article/daa3d0d78602468aa27cb627f5a790e8 |
geographic |
Antarctic The Antarctic Antarctic Peninsula |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula |
genre |
Antarc* Antarctic Antarctic Peninsula |
genre_facet |
Antarc* Antarctic Antarctic Peninsula |
op_source |
Geosciences, Vol 8, Iss 9, p 323 (2018) |
op_relation |
http://www.mdpi.com/2076-3263/8/9/323 https://doaj.org/toc/2076-3263 2076-3263 doi:10.3390/geosciences8090323 https://doaj.org/article/daa3d0d78602468aa27cb627f5a790e8 |
op_doi |
https://doi.org/10.3390/geosciences8090323 |
container_title |
Geosciences |
container_volume |
8 |
container_issue |
9 |
container_start_page |
323 |
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1766272412109766656 |