Consideration of ocean tides in an OGCM and impacts on subseasonal to decadal polar motion excitation

Thomas, Maik; Sündermann, Jürgen; Maier‐Reimer, Ernst

doi:10.1029/2000gl012234

Cited by 113 publications

(100 citation statements)

References 14 publications

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“…The basis of the atmospheric part as well as of the ocean response to atmospheric pressure is the operational analysis of the European Centre for Medium Range Weather Forecast (ECMWF;ECMWF 2007a,b). The basis of the oceanic component is the Ocean Model for Circulation and Tides (OMCT; Thomas et al 2001). The latest RL05 presents an improved OMCT with higher spatial resolution (1 • regular grid in RL05 instead of 1.875 • in RL04) and improved parametrization (e.g.…”

Section: E X T E N D E D a O D 1 B R L 0 5 P Ro D U C Tmentioning

confidence: 99%

Impact of Atmospheric and Oceanic De-aliasing Level-1B (AOD1B) products on precise orbits of altimetry satellites and altimetry results

Rudenko¹,

Dettmering

Esselborn³

et al. 2016

Geophys. J. Int.

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S U M M A R YWe have extended backwards from 2001 to 1979 the current release 05 (RL05) of the Gravity Recovery and Climate Experiment (GRACE) Atmospheric and Oceanic De-aliasing Level-1B (AOD1B) product and studied the impact of this and a previous release 04 (RL04) of the AOD1B product on precise orbits of five altimetry satellites (ERS-1, ERS-2, TOPEX/Poseidon, Envisat and Jason-1) for the time span 1991-2012, as compared to the case when no AOD1B product is used. We have found that using AOD1B RL05 product reduces root mean square (RMS) fits of satellite laser ranging (SLR) observations by about 1.0-6.4 per cent, 2-d arc overlaps in radial, cross-track and along-track directions by about 1.3-12.0, 0.3-10.0 and 2.0-10.0 per cent, respectively, for various satellites tested, as compared to the case without AOD1B product. Using AOD1B RL05 product instead of RL04 one reduces SLR RMS fits by 0.1-0.7 per cent, 2-d arc overlaps in radial, cross-track and along-track directions by 0.1-0.6, 0.1-1.3 and 0.2-1.2 per cent, respectively, for the satellite orbits tested. The multi-mission crossover analysis shows that the application of an AOD1B product reduces the scatter of radial errors by 0.4-2.8 per cent for the satellite missions studied. At the regions with the most pronounced changes the use of the AOD1B products improves the consistency between the sea level as measured by the TOPEX and ERS-2 missions and by the Jason-1 and Envisat missions by 5 to 10 per cent (globally by about 2 per cent). The results of our study show that extended AOD1B RL05 product performs better than the AOD1B RL04 and improves orbits of altimetry satellites and consistency of sea level products.

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Section: E X T E N D E D a O D 1 B R L 0 5 P Ro D U C Tmentioning

confidence: 99%

Impact of Atmospheric and Oceanic De-aliasing Level-1B (AOD1B) products on precise orbits of altimetry satellites and altimetry results

Rudenko¹,

Dettmering

Esselborn³

et al. 2016

Geophys. J. Int.

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“…Up-todate information on the status of this product can be obtained from the web-pages at www.gfz-potsdam.de/AOD1B. The basis of the oceanic part is the Ocean Model for Circulation and Tides (OMCT; Thomas et al 2001), which has been improved for AOD1B RL05 in terms of both parametrizations and spatial resolution (Dobslaw et al 2013). For the atmospheric part as well as for the atmospheric boundary conditions required for the ocean model, which includes atmospheric pressure, surface winds, heat and freshwater fluxes, the necessary input data (surface pressure, surface geopotential and vertical profiles of temperature and specific humidity) are extracted from the European Centre for Medium Range Weather Forecast (ECMWF) archives.…”

Section: Introductionmentioning

confidence: 99%

Correction of inconsistencies in ECMWF's operational analysis data during de-aliasing of GRACE gravity models

Fagiolini¹,

Flechtner²,

Horwath³

et al. 2015

Geophys. J. Int.

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“…Similarly, there are no significant long-term trends in the freshwater fluxes from the atmosphere or land. Neither model includes the secondary potential from ocean loading and self-attraction, but these are expected to contribute less than 8% to Earth orientation variations [Thomas et al, 2001]. All reported results are annual mean deviations relative to an unperturbed climate state from each model, and we have subtracted parallel control simulations for each model with no changes in greenhouse gas forcing to remove any small model drift that is not related to changes in the forcing.…”

Section: Methodsmentioning

confidence: 99%

Long‐term polar motion excited by ocean thermal expansion

Landerer

Jungclaus

Marotzke

2009

Geophysical Research Letters

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[1] Ocean warming is commonly considered unable to excite significant long-term trends in polar motion. Here, however, we argue that this assumption needs to be revised. We demonstrate that steric sea level rise leads to a distinct pattern of horizontal mass redistribution within ocean basins and hence to ocean bottom pressure changes that alter Earth's inertia tensor on decadal and longer time scales. Based on Earth system model simulations, we estimate that ocean warming leads to polar motion of 0.15 to 0.20 milliarcseconds per one millimeter of thermal sea level rise. This is equivalent to a polar motion rate of about 0.47 milliarcseconds per year towards 155°W to 160°W for current projections of steric sea level rise during the 21st century. The proposed polar motion signal is therefore not negligible in comparison to other decadal and secular signals, and should be accounted for in the interpretation of polar motion observations.

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Consideration of ocean tides in an OGCM and impacts on subseasonal to decadal polar motion excitation

Cited by 113 publications

References 14 publications

Impact of Atmospheric and Oceanic De-aliasing Level-1B (AOD1B) products on precise orbits of altimetry satellites and altimetry results

Impact of Atmospheric and Oceanic De-aliasing Level-1B (AOD1B) products on precise orbits of altimetry satellites and altimetry results

Correction of inconsistencies in ECMWF's operational analysis data during de-aliasing of GRACE gravity models

Long‐term polar motion excited by ocean thermal expansion

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