Importance of numerical ocean modelling and in situ ocean bottom pressure observations for satellite gravimetry from GRACE and GRACE-FO
The GRACE and GRACE-FO satellites observe the redistribution of mass in terrestrial water storage, ice sheets, oceans, atmosphere, and solid Earth. Because GRACE data is typically accumulated into monthly-mean gravity fields, an a priori background model, namely the Atmosphere and Ocean Dealiasing L...
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ftfuberlin:oai:refubium.fu-berlin.de:fub188/27917 2023-05-15T13:58:59+02:00 Importance of numerical ocean modelling and in situ ocean bottom pressure observations for satellite gravimetry from GRACE and GRACE-FO Poropat, Lea female Thomas, Maik Flechtner, Frank 2020 x, 103 Seiten application/pdf https://refubium.fu-berlin.de/handle/fub188/27917 https://doi.org/10.17169/refubium-27670 https://nbn-resolving.org/urn:nbn:de:kobv:188-refubium-27917-2 eng eng https://refubium.fu-berlin.de/handle/fub188/27917 http://dx.doi.org/10.17169/refubium-27670 urn:nbn:de:kobv:188-refubium-27917-2 http://www.fu-berlin.de/sites/refubium/rechtliches/Nutzungsbedingungen satellite gravimetry ocean modelling ocean bottom pressure dealiasing ddc:550 doc-type:doctoralThesis 2020 ftfuberlin https://doi.org/10.17169/refubium-27670 2022-05-15T20:47:02Z The GRACE and GRACE-FO satellites observe the redistribution of mass in terrestrial water storage, ice sheets, oceans, atmosphere, and solid Earth. Because GRACE data is typically accumulated into monthly-mean gravity fields, an a priori background model, namely the Atmosphere and Ocean Dealiasing Level 1B (AOD1B) product, is applied to remove non-tidal variability that would otherwise alias into the monthly solutions. The main disadvantage of AOD1B RL06 compared to its previous release is that it does not simulate the dynamics beneath the Antarctic ice shelves, which can have a strong influence on global ocean circulation. The primary motivation for this work is the development of the new release of AOD1B, but the performed model experiments can also provide useful insight into the influence processes in the Southern Ocean have on global ocean dynamics. To be able to test various model experiments, as well as to compare GRACE gravity field solutions, validation against in situ measured ocean bottom pressure (OBP) is used. The validation is somewhat better suited for submonthly variability of the ocean models than for long-term signals measured by GRACE because the in situ time series are affected by the errors in trend and drift removal on longer temporal scales. The difference between the pointwise in situ and the area-averaging GRACE measuring technique also influences the comparison. It is shown that post-processing choices can severely impact the results of the validation of GRACE fields, so if different solutions are compared, their post-processing needs to be identical. Validation against in situ OBP is used to compare the EGSIEM combined GRACE solution with its five contributing datasets. It is shown that the combined solution is very close to the leading CSR RL05 and ITSG-Grace2016 solutions, outperforming the others. To investigate whether GRACE is able to detect submonthly signals, the ITSG-Grace2016 daily Kalman solution, from which the submonthly atmospheric and oceanic variability has been removed ... Doctoral or Postdoctoral Thesis Antarc* Antarctic Ice Shelves Southern Ocean Freie Universität Berlin: Refubium (FU Berlin) Antarctic Southern Ocean The Antarctic |
institution |
Open Polar |
collection |
Freie Universität Berlin: Refubium (FU Berlin) |
op_collection_id |
ftfuberlin |
language |
English |
topic |
satellite gravimetry ocean modelling ocean bottom pressure dealiasing ddc:550 |
spellingShingle |
satellite gravimetry ocean modelling ocean bottom pressure dealiasing ddc:550 Poropat, Lea Importance of numerical ocean modelling and in situ ocean bottom pressure observations for satellite gravimetry from GRACE and GRACE-FO |
topic_facet |
satellite gravimetry ocean modelling ocean bottom pressure dealiasing ddc:550 |
description |
The GRACE and GRACE-FO satellites observe the redistribution of mass in terrestrial water storage, ice sheets, oceans, atmosphere, and solid Earth. Because GRACE data is typically accumulated into monthly-mean gravity fields, an a priori background model, namely the Atmosphere and Ocean Dealiasing Level 1B (AOD1B) product, is applied to remove non-tidal variability that would otherwise alias into the monthly solutions. The main disadvantage of AOD1B RL06 compared to its previous release is that it does not simulate the dynamics beneath the Antarctic ice shelves, which can have a strong influence on global ocean circulation. The primary motivation for this work is the development of the new release of AOD1B, but the performed model experiments can also provide useful insight into the influence processes in the Southern Ocean have on global ocean dynamics. To be able to test various model experiments, as well as to compare GRACE gravity field solutions, validation against in situ measured ocean bottom pressure (OBP) is used. The validation is somewhat better suited for submonthly variability of the ocean models than for long-term signals measured by GRACE because the in situ time series are affected by the errors in trend and drift removal on longer temporal scales. The difference between the pointwise in situ and the area-averaging GRACE measuring technique also influences the comparison. It is shown that post-processing choices can severely impact the results of the validation of GRACE fields, so if different solutions are compared, their post-processing needs to be identical. Validation against in situ OBP is used to compare the EGSIEM combined GRACE solution with its five contributing datasets. It is shown that the combined solution is very close to the leading CSR RL05 and ITSG-Grace2016 solutions, outperforming the others. To investigate whether GRACE is able to detect submonthly signals, the ITSG-Grace2016 daily Kalman solution, from which the submonthly atmospheric and oceanic variability has been removed ... |
author2 |
female Thomas, Maik Flechtner, Frank |
format |
Doctoral or Postdoctoral Thesis |
author |
Poropat, Lea |
author_facet |
Poropat, Lea |
author_sort |
Poropat, Lea |
title |
Importance of numerical ocean modelling and in situ ocean bottom pressure observations for satellite gravimetry from GRACE and GRACE-FO |
title_short |
Importance of numerical ocean modelling and in situ ocean bottom pressure observations for satellite gravimetry from GRACE and GRACE-FO |
title_full |
Importance of numerical ocean modelling and in situ ocean bottom pressure observations for satellite gravimetry from GRACE and GRACE-FO |
title_fullStr |
Importance of numerical ocean modelling and in situ ocean bottom pressure observations for satellite gravimetry from GRACE and GRACE-FO |
title_full_unstemmed |
Importance of numerical ocean modelling and in situ ocean bottom pressure observations for satellite gravimetry from GRACE and GRACE-FO |
title_sort |
importance of numerical ocean modelling and in situ ocean bottom pressure observations for satellite gravimetry from grace and grace-fo |
publishDate |
2020 |
url |
https://refubium.fu-berlin.de/handle/fub188/27917 https://doi.org/10.17169/refubium-27670 https://nbn-resolving.org/urn:nbn:de:kobv:188-refubium-27917-2 |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Ice Shelves Southern Ocean |
genre_facet |
Antarc* Antarctic Ice Shelves Southern Ocean |
op_relation |
https://refubium.fu-berlin.de/handle/fub188/27917 http://dx.doi.org/10.17169/refubium-27670 urn:nbn:de:kobv:188-refubium-27917-2 |
op_rights |
http://www.fu-berlin.de/sites/refubium/rechtliches/Nutzungsbedingungen |
op_doi |
https://doi.org/10.17169/refubium-27670 |
_version_ |
1766267351993417728 |