Mass-related excitation of polar motion: an assessment of the new RL06 GRACE gravity field models
Abstract The new Release-06 (RL06) Gravity Recovery and Climate Experiment (GRACE) gravity field solutions are evaluated by converting them into equatorial effective angular momentum functions (so-called excitation functions) for polar motion and comparing these to respective time series based on sp...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2018-12-01
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| Series: | Earth, Planets and Space |
| Subjects: | |
| Online Access: | http://link.springer.com/article/10.1186/s40623-018-0968-4 |
| _version_ | 1811259785266331648 |
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| author | Franziska Göttl Michael Schmidt Florian Seitz |
| author_facet | Franziska Göttl Michael Schmidt Florian Seitz |
| author_sort | Franziska Göttl |
| collection | DOAJ |
| description | Abstract The new Release-06 (RL06) Gravity Recovery and Climate Experiment (GRACE) gravity field solutions are evaluated by converting them into equatorial effective angular momentum functions (so-called excitation functions) for polar motion and comparing these to respective time series based on space-geodetic observations (geodetic excitation). The same is performed for the older RL05 solutions using identical processing. Maps of equivalent water heights derived from both releases show that the signal-to-noise ratio is significantly improved in RL06. The derived polar motion excitation functions from RL05 and RL06 differ by about 15$$\%$$ % . An analysis of the contributions of different Earth subsystems revealed that the release update mainly influenced the hydrological (12$$\%$$ % ) and oceanic excitations (17$$\%$$ % ), but it has a relatively small impact on the cryospheric excitations related to Antarctica (4$$\%$$ % ) and Greenland (1$$\%$$ % ). The RL06 data from different GRACE processing centers are more consistent among each other than the previous RL05 data. Comparisons of the GRACE-based excitation functions with the geodetic and model-based oceanic excitations show that the latest release update improved the agreement by about 2 to 15 percentage points. |
| first_indexed | 2024-04-12T18:36:47Z |
| format | Article |
| id | doaj.art-8b38af8ae40941a19d6f713ea9186abd |
| institution | Directory Open Access Journal |
| issn | 1880-5981 |
| language | English |
| last_indexed | 2024-04-12T18:36:47Z |
| publishDate | 2018-12-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Earth, Planets and Space |
| spelling | doaj.art-8b38af8ae40941a19d6f713ea9186abd2022-12-22T03:20:55ZengSpringerOpenEarth, Planets and Space1880-59812018-12-0170111010.1186/s40623-018-0968-4Mass-related excitation of polar motion: an assessment of the new RL06 GRACE gravity field modelsFranziska Göttl0Michael Schmidt1Florian Seitz2Deutsches Geodätisches Forschungsinstitut, Technische Universität MünchenDeutsches Geodätisches Forschungsinstitut, Technische Universität MünchenDeutsches Geodätisches Forschungsinstitut, Technische Universität MünchenAbstract The new Release-06 (RL06) Gravity Recovery and Climate Experiment (GRACE) gravity field solutions are evaluated by converting them into equatorial effective angular momentum functions (so-called excitation functions) for polar motion and comparing these to respective time series based on space-geodetic observations (geodetic excitation). The same is performed for the older RL05 solutions using identical processing. Maps of equivalent water heights derived from both releases show that the signal-to-noise ratio is significantly improved in RL06. The derived polar motion excitation functions from RL05 and RL06 differ by about 15$$\%$$ % . An analysis of the contributions of different Earth subsystems revealed that the release update mainly influenced the hydrological (12$$\%$$ % ) and oceanic excitations (17$$\%$$ % ), but it has a relatively small impact on the cryospheric excitations related to Antarctica (4$$\%$$ % ) and Greenland (1$$\%$$ % ). The RL06 data from different GRACE processing centers are more consistent among each other than the previous RL05 data. Comparisons of the GRACE-based excitation functions with the geodetic and model-based oceanic excitations show that the latest release update improved the agreement by about 2 to 15 percentage points.http://link.springer.com/article/10.1186/s40623-018-0968-4GRACE RL06 gravity field modelsPolar motion excitationEffective angular momentum functions |
| spellingShingle | Franziska Göttl Michael Schmidt Florian Seitz Mass-related excitation of polar motion: an assessment of the new RL06 GRACE gravity field models Earth, Planets and Space GRACE RL06 gravity field models Polar motion excitation Effective angular momentum functions |
| title | Mass-related excitation of polar motion: an assessment of the new RL06 GRACE gravity field models |
| title_full | Mass-related excitation of polar motion: an assessment of the new RL06 GRACE gravity field models |
| title_fullStr | Mass-related excitation of polar motion: an assessment of the new RL06 GRACE gravity field models |
| title_full_unstemmed | Mass-related excitation of polar motion: an assessment of the new RL06 GRACE gravity field models |
| title_short | Mass-related excitation of polar motion: an assessment of the new RL06 GRACE gravity field models |
| title_sort | mass related excitation of polar motion an assessment of the new rl06 grace gravity field models |
| topic | GRACE RL06 gravity field models Polar motion excitation Effective angular momentum functions |
| url | http://link.springer.com/article/10.1186/s40623-018-0968-4 |
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