On Tide Aliasing in GRACE Time-Variable Gravity Observations
Aliasing error induced by tide-related high frequency mass variations is one of the most significant errors in the Gravity Recovery and Climate Experiment (GRACE). In the present work, we evaluated the 161.0-day S 2 , 171.2-day P 1 , and 322.1-day S 1 ocean tide aliasing in GRACE latest RL06 data ba...
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ftdoajarticles:oai:doaj.org/article:3774e1b1d73a4cf18b0048ab13ad71a5 2023-05-15T13:53:13+02:00 On Tide Aliasing in GRACE Time-Variable Gravity Observations Zhen Li Zizhan Zhang Hansheng Wang 2022-10-01T00:00:00Z https://doi.org/10.3390/rs14215403 https://doaj.org/article/3774e1b1d73a4cf18b0048ab13ad71a5 EN eng MDPI AG https://www.mdpi.com/2072-4292/14/21/5403 https://doaj.org/toc/2072-4292 doi:10.3390/rs14215403 2072-4292 https://doaj.org/article/3774e1b1d73a4cf18b0048ab13ad71a5 Remote Sensing, Vol 14, Iss 5403, p 5403 (2022) GRACE tide aliasing mascon data polar regions Science Q article 2022 ftdoajarticles https://doi.org/10.3390/rs14215403 2022-12-30T23:16:33Z Aliasing error induced by tide-related high frequency mass variations is one of the most significant errors in the Gravity Recovery and Climate Experiment (GRACE). In the present work, we evaluated the 161.0-day S 2 , 171.2-day P 1 , and 322.1-day S 1 ocean tide aliasing in GRACE latest RL06 data based on nearly 15 years of observation from 2002 to 2017. Tide aliasing was still obvious for current GRACE observations, especially for S 2 and P 1 aliasing. S 2 aliasing was mostly evident over West Antarctica, and was a clearly eastward propagation that travelled around Antarctica in about 2 years, while P 1 showed strongest aliasing over South Greenland. More seriously, we found that GRACE mascon data showed an extremely large aliasing error. The mascon data may have unintentionally amplified the aliasing error on land due to the regularization (or constraint) applied for reducing signal leakage. Enough attention must be paid to tide aliasing when using GRACE for assessing mass variations at high latitudes (e.g., glaciers in polar regions) which can cause potential obstacles to estimation of actual seasonality. Article in Journal/Newspaper Antarc* Antarctica Greenland West Antarctica Directory of Open Access Journals: DOAJ Articles West Antarctica Greenland Remote Sensing 14 21 5403 |
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Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
GRACE tide aliasing mascon data polar regions Science Q |
spellingShingle |
GRACE tide aliasing mascon data polar regions Science Q Zhen Li Zizhan Zhang Hansheng Wang On Tide Aliasing in GRACE Time-Variable Gravity Observations |
topic_facet |
GRACE tide aliasing mascon data polar regions Science Q |
description |
Aliasing error induced by tide-related high frequency mass variations is one of the most significant errors in the Gravity Recovery and Climate Experiment (GRACE). In the present work, we evaluated the 161.0-day S 2 , 171.2-day P 1 , and 322.1-day S 1 ocean tide aliasing in GRACE latest RL06 data based on nearly 15 years of observation from 2002 to 2017. Tide aliasing was still obvious for current GRACE observations, especially for S 2 and P 1 aliasing. S 2 aliasing was mostly evident over West Antarctica, and was a clearly eastward propagation that travelled around Antarctica in about 2 years, while P 1 showed strongest aliasing over South Greenland. More seriously, we found that GRACE mascon data showed an extremely large aliasing error. The mascon data may have unintentionally amplified the aliasing error on land due to the regularization (or constraint) applied for reducing signal leakage. Enough attention must be paid to tide aliasing when using GRACE for assessing mass variations at high latitudes (e.g., glaciers in polar regions) which can cause potential obstacles to estimation of actual seasonality. |
format |
Article in Journal/Newspaper |
author |
Zhen Li Zizhan Zhang Hansheng Wang |
author_facet |
Zhen Li Zizhan Zhang Hansheng Wang |
author_sort |
Zhen Li |
title |
On Tide Aliasing in GRACE Time-Variable Gravity Observations |
title_short |
On Tide Aliasing in GRACE Time-Variable Gravity Observations |
title_full |
On Tide Aliasing in GRACE Time-Variable Gravity Observations |
title_fullStr |
On Tide Aliasing in GRACE Time-Variable Gravity Observations |
title_full_unstemmed |
On Tide Aliasing in GRACE Time-Variable Gravity Observations |
title_sort |
on tide aliasing in grace time-variable gravity observations |
publisher |
MDPI AG |
publishDate |
2022 |
url |
https://doi.org/10.3390/rs14215403 https://doaj.org/article/3774e1b1d73a4cf18b0048ab13ad71a5 |
geographic |
West Antarctica Greenland |
geographic_facet |
West Antarctica Greenland |
genre |
Antarc* Antarctica Greenland West Antarctica |
genre_facet |
Antarc* Antarctica Greenland West Antarctica |
op_source |
Remote Sensing, Vol 14, Iss 5403, p 5403 (2022) |
op_relation |
https://www.mdpi.com/2072-4292/14/21/5403 https://doaj.org/toc/2072-4292 doi:10.3390/rs14215403 2072-4292 https://doaj.org/article/3774e1b1d73a4cf18b0048ab13ad71a5 |
op_doi |
https://doi.org/10.3390/rs14215403 |
container_title |
Remote Sensing |
container_volume |
14 |
container_issue |
21 |
container_start_page |
5403 |
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1766258191938617344 |