Detection of time variable gravity signals using terrestrial clock networks
The relativistic redshift between two earth-bound clocks can be interpreted in terms of gravity potential variation between the clock locations. A clock with a fractional frequency uncertainty of 10-18 is sensitive to a gravity potential variation of 0.1 m2/s2 or a height difference of 1 cm. Case st...
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ftunivhannover:oai:www.repo.uni-hannover.de:123456789/16395 2024-04-14T08:11:26+00:00 Detection of time variable gravity signals using terrestrial clock networks Vincent, Asha Müller, Jürgen 2023 https://www.repo.uni-hannover.de/handle/123456789/16395 https://doi.org/10.15488/16268 eng eng Amsterdam [u.a.] : Elsevier Science DOI:https://doi.org/10.1016/j.asr.2023.07.058 ESSN:0273-1177 http://dx.doi.org/10.15488/16268 https://www.repo.uni-hannover.de/handle/123456789/16395 CC BY 4.0 Unported https://creativecommons.org/licenses/by/4.0 frei zugänglich Advances in Space Research Early view (2024) Advances in Space Research Chronometric geodesy Gravitational redshift Load Love numbers Time-variable gravity ddc:620 ddc:520 status-type:publishedVersion doc-type:Article doc-type:Text 2023 ftunivhannover https://doi.org/10.15488/1626810.1016/j.asr.2023.07.058 2024-03-21T16:33:11Z The relativistic redshift between two earth-bound clocks can be interpreted in terms of gravity potential variation between the clock locations. A clock with a fractional frequency uncertainty of 10-18 is sensitive to a gravity potential variation of 0.1 m2/s2 or a height difference of 1 cm. Case studies for four regions affected by different mass change processes - Himalaya, Amazon, Greenland, and Fennoscandia - have been carried out. As the clocks rest on the deformable Earth's surface, clock observations do not only include potential variations due to mass changes but also associated variations due to the vertical deformation of the land. For the simulations, vertical displacements were derived from real GNSS (Global Navigation Satellite Systems) measurements, and mass variations were computed from GRACE (Gravity Recovery And Climate Experiment) solutions. In the Himalayan region, seasonal variations with a maximum range of -0.20.2 m2/s2 were obtained. There, early and long-lasting precipitation patterns in North-East India and the gradual spreading towards the West can be observed by a dedicated clock network. For the Amazon region, seasonal variations with a maximum range of -0.50.5 m2/s2 observed by clocks also reveals the Amazon's seasonal properties of annual rainfall variability at the North and South of the equator. The rainy season in the North of the equator is during the summer season from June to August, but from November to April in the South of the equator. The long-term trend of the ice mass loss in Greenland between 2004 and 2015 causes signals of potential variations of 1 m2/s2 that again can clearly be observed by clock measurements. Especially, the higher rates of mass variations in the west and south parts of Greenland can well be observed. The land uplift pattern of Fennoscandia due to the GIA (Glacial Isostatic Adjustment) can also be detected using optical clocks, however, the vertical deformations dominate the signal and not the mass changes. These examples illustrate that terrestrial ... Article in Journal/Newspaper Fennoscandia Greenland Institutional Repository of Leibniz Universität Hannover Greenland |
institution |
Open Polar |
collection |
Institutional Repository of Leibniz Universität Hannover |
op_collection_id |
ftunivhannover |
language |
English |
topic |
Chronometric geodesy Gravitational redshift Load Love numbers Time-variable gravity ddc:620 ddc:520 |
spellingShingle |
Chronometric geodesy Gravitational redshift Load Love numbers Time-variable gravity ddc:620 ddc:520 Vincent, Asha Müller, Jürgen Detection of time variable gravity signals using terrestrial clock networks |
topic_facet |
Chronometric geodesy Gravitational redshift Load Love numbers Time-variable gravity ddc:620 ddc:520 |
description |
The relativistic redshift between two earth-bound clocks can be interpreted in terms of gravity potential variation between the clock locations. A clock with a fractional frequency uncertainty of 10-18 is sensitive to a gravity potential variation of 0.1 m2/s2 or a height difference of 1 cm. Case studies for four regions affected by different mass change processes - Himalaya, Amazon, Greenland, and Fennoscandia - have been carried out. As the clocks rest on the deformable Earth's surface, clock observations do not only include potential variations due to mass changes but also associated variations due to the vertical deformation of the land. For the simulations, vertical displacements were derived from real GNSS (Global Navigation Satellite Systems) measurements, and mass variations were computed from GRACE (Gravity Recovery And Climate Experiment) solutions. In the Himalayan region, seasonal variations with a maximum range of -0.20.2 m2/s2 were obtained. There, early and long-lasting precipitation patterns in North-East India and the gradual spreading towards the West can be observed by a dedicated clock network. For the Amazon region, seasonal variations with a maximum range of -0.50.5 m2/s2 observed by clocks also reveals the Amazon's seasonal properties of annual rainfall variability at the North and South of the equator. The rainy season in the North of the equator is during the summer season from June to August, but from November to April in the South of the equator. The long-term trend of the ice mass loss in Greenland between 2004 and 2015 causes signals of potential variations of 1 m2/s2 that again can clearly be observed by clock measurements. Especially, the higher rates of mass variations in the west and south parts of Greenland can well be observed. The land uplift pattern of Fennoscandia due to the GIA (Glacial Isostatic Adjustment) can also be detected using optical clocks, however, the vertical deformations dominate the signal and not the mass changes. These examples illustrate that terrestrial ... |
format |
Article in Journal/Newspaper |
author |
Vincent, Asha Müller, Jürgen |
author_facet |
Vincent, Asha Müller, Jürgen |
author_sort |
Vincent, Asha |
title |
Detection of time variable gravity signals using terrestrial clock networks |
title_short |
Detection of time variable gravity signals using terrestrial clock networks |
title_full |
Detection of time variable gravity signals using terrestrial clock networks |
title_fullStr |
Detection of time variable gravity signals using terrestrial clock networks |
title_full_unstemmed |
Detection of time variable gravity signals using terrestrial clock networks |
title_sort |
detection of time variable gravity signals using terrestrial clock networks |
publisher |
Amsterdam [u.a.] : Elsevier Science |
publishDate |
2023 |
url |
https://www.repo.uni-hannover.de/handle/123456789/16395 https://doi.org/10.15488/16268 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Fennoscandia Greenland |
genre_facet |
Fennoscandia Greenland |
op_source |
Advances in Space Research Early view (2024) Advances in Space Research |
op_relation |
DOI:https://doi.org/10.1016/j.asr.2023.07.058 ESSN:0273-1177 http://dx.doi.org/10.15488/16268 https://www.repo.uni-hannover.de/handle/123456789/16395 |
op_rights |
CC BY 4.0 Unported https://creativecommons.org/licenses/by/4.0 frei zugänglich |
op_doi |
https://doi.org/10.15488/1626810.1016/j.asr.2023.07.058 |
_version_ |
1796309131251941376 |