An optimized short-arc approach: methodology and application to develop refined time series of Tongji-Grace2018 GRACE monthly solutions
peer reviewed Abstract Considering the unstable inversion of ill-conditioned intermediate matrix required in each integral arc in the short-arc approach presented in Chen et al. (2015), an optimized short-arc method via stabilizing the inversion is proposed. To account for frequency-dependent noise...
Published in: | Journal of Geophysical Research: Solid Earth |
---|---|
Main Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2019
|
Subjects: | |
Online Access: | https://orbilu.uni.lu/handle/10993/39560 https://orbilu.uni.lu/bitstream/10993/39560/1/16491632.pdf https://doi.org/10.1029/2018JB016596 |
id |
ftunivluxembourg:oai:orbilu.uni.lu:10993/39560 |
---|---|
record_format |
openpolar |
spelling |
ftunivluxembourg:oai:orbilu.uni.lu:10993/39560 2024-04-21T08:03:59+00:00 An optimized short-arc approach: methodology and application to develop refined time series of Tongji-Grace2018 GRACE monthly solutions Chen, Qiujie Shen, Yunzhong Chen, Wu Francis, Olivier Zhang, Xingfu Chen, Qiang Li, Weiwei Chen, Tianyi 2019-06 https://orbilu.uni.lu/handle/10993/39560 https://orbilu.uni.lu/bitstream/10993/39560/1/16491632.pdf https://doi.org/10.1029/2018JB016596 en eng Wiley https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2018JB016596 urn:issn:2169-9356 https://orbilu.uni.lu/handle/10993/39560 info:hdl:10993/39560 https://orbilu.uni.lu/bitstream/10993/39560/1/16491632.pdf doi:10.1029/2018JB016596 scopus-id:2-s2.0-85067837811 wos:000477722100038 open access http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess Journal of Geophysical Research. Solid Earth, 124 (6), 6010-6038 (2019-06) Satellite geodesy GRACE monthly gravity field solutions optimized short-arc approach frequency-dependent noise Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique journal article http://purl.org/coar/resource_type/c_6501 info:eu-repo/semantics/article peer reviewed 2019 ftunivluxembourg https://doi.org/10.1029/2018JB016596 2024-03-27T14:12:11Z peer reviewed Abstract Considering the unstable inversion of ill-conditioned intermediate matrix required in each integral arc in the short-arc approach presented in Chen et al. (2015), an optimized short-arc method via stabilizing the inversion is proposed. To account for frequency-dependent noise in observations, a noise whitening technique is implemented in the optimized short-arc approach. Our study shows the optimized short-arc method is able to stabilize the inversion and eventually prolong the arc length to 6 hours. In addition, the noise whitening method is able to mitigate the impacts of low-frequency noise in observations. Using the optimized short-arc approach, a refined time series of GRACE monthly models called Tongji-Grace2018 has been developed. The analyses allow us to derive the following conclusions: (a) during the analyses over the river basins (i.e. Amazon, Mississippi, Irrawaddy and Taz) and Greenland, the correlation coefficients of mass changes between Tongji-Grace2018 and others (i.e. CSR RL06, GFZ RL06 and JPL RL06 Mascon) are all over 92 and the corresponding amplitudes are comparable; (b) the signals of Tongji-Grace2018 agree well with those of CSR RL06, GFZ RL06, ITSG-Grace2018 and JPL RL06 Mascon, while Tongji-Grace2018 and ITSG-Grace2018 are less noisy than CSR RL06 and GFZ RL06; (c) clearer global mass change trend and less striping noise over oceans can be observed in Tongji-Grace2018 even only using decorrelation filtering; and (d) for the tests over Sahara, over 36 and 19 of noise reductions are achieved by Tongji-Grace2018 relative to CSR RL06 in the cases of using decorrelation filtering and combined filtering, respectively. Article in Journal/Newspaper Greenland University of Luxembourg: ORBilu - Open Repository and Bibliography Journal of Geophysical Research: Solid Earth 124 6 6010 6038 |
institution |
Open Polar |
collection |
University of Luxembourg: ORBilu - Open Repository and Bibliography |
op_collection_id |
ftunivluxembourg |
language |
English |
topic |
Satellite geodesy GRACE monthly gravity field solutions optimized short-arc approach frequency-dependent noise Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique |
spellingShingle |
Satellite geodesy GRACE monthly gravity field solutions optimized short-arc approach frequency-dependent noise Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique Chen, Qiujie Shen, Yunzhong Chen, Wu Francis, Olivier Zhang, Xingfu Chen, Qiang Li, Weiwei Chen, Tianyi An optimized short-arc approach: methodology and application to develop refined time series of Tongji-Grace2018 GRACE monthly solutions |
topic_facet |
Satellite geodesy GRACE monthly gravity field solutions optimized short-arc approach frequency-dependent noise Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique |
description |
peer reviewed Abstract Considering the unstable inversion of ill-conditioned intermediate matrix required in each integral arc in the short-arc approach presented in Chen et al. (2015), an optimized short-arc method via stabilizing the inversion is proposed. To account for frequency-dependent noise in observations, a noise whitening technique is implemented in the optimized short-arc approach. Our study shows the optimized short-arc method is able to stabilize the inversion and eventually prolong the arc length to 6 hours. In addition, the noise whitening method is able to mitigate the impacts of low-frequency noise in observations. Using the optimized short-arc approach, a refined time series of GRACE monthly models called Tongji-Grace2018 has been developed. The analyses allow us to derive the following conclusions: (a) during the analyses over the river basins (i.e. Amazon, Mississippi, Irrawaddy and Taz) and Greenland, the correlation coefficients of mass changes between Tongji-Grace2018 and others (i.e. CSR RL06, GFZ RL06 and JPL RL06 Mascon) are all over 92 and the corresponding amplitudes are comparable; (b) the signals of Tongji-Grace2018 agree well with those of CSR RL06, GFZ RL06, ITSG-Grace2018 and JPL RL06 Mascon, while Tongji-Grace2018 and ITSG-Grace2018 are less noisy than CSR RL06 and GFZ RL06; (c) clearer global mass change trend and less striping noise over oceans can be observed in Tongji-Grace2018 even only using decorrelation filtering; and (d) for the tests over Sahara, over 36 and 19 of noise reductions are achieved by Tongji-Grace2018 relative to CSR RL06 in the cases of using decorrelation filtering and combined filtering, respectively. |
format |
Article in Journal/Newspaper |
author |
Chen, Qiujie Shen, Yunzhong Chen, Wu Francis, Olivier Zhang, Xingfu Chen, Qiang Li, Weiwei Chen, Tianyi |
author_facet |
Chen, Qiujie Shen, Yunzhong Chen, Wu Francis, Olivier Zhang, Xingfu Chen, Qiang Li, Weiwei Chen, Tianyi |
author_sort |
Chen, Qiujie |
title |
An optimized short-arc approach: methodology and application to develop refined time series of Tongji-Grace2018 GRACE monthly solutions |
title_short |
An optimized short-arc approach: methodology and application to develop refined time series of Tongji-Grace2018 GRACE monthly solutions |
title_full |
An optimized short-arc approach: methodology and application to develop refined time series of Tongji-Grace2018 GRACE monthly solutions |
title_fullStr |
An optimized short-arc approach: methodology and application to develop refined time series of Tongji-Grace2018 GRACE monthly solutions |
title_full_unstemmed |
An optimized short-arc approach: methodology and application to develop refined time series of Tongji-Grace2018 GRACE monthly solutions |
title_sort |
optimized short-arc approach: methodology and application to develop refined time series of tongji-grace2018 grace monthly solutions |
publisher |
Wiley |
publishDate |
2019 |
url |
https://orbilu.uni.lu/handle/10993/39560 https://orbilu.uni.lu/bitstream/10993/39560/1/16491632.pdf https://doi.org/10.1029/2018JB016596 |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Journal of Geophysical Research. Solid Earth, 124 (6), 6010-6038 (2019-06) |
op_relation |
https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2018JB016596 urn:issn:2169-9356 https://orbilu.uni.lu/handle/10993/39560 info:hdl:10993/39560 https://orbilu.uni.lu/bitstream/10993/39560/1/16491632.pdf doi:10.1029/2018JB016596 scopus-id:2-s2.0-85067837811 wos:000477722100038 |
op_rights |
open access http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2018JB016596 |
container_title |
Journal of Geophysical Research: Solid Earth |
container_volume |
124 |
container_issue |
6 |
container_start_page |
6010 |
op_container_end_page |
6038 |
_version_ |
1796943637837250560 |