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Your search keyword '"Schröter, J."' showing total 9 results
Start Over Author "Schröter, J." Topic 550 - earth sciences
9 results on '"Schröter, J."'

1. Assimilation of Earth Rotation Parameters in an ocean model

Author

Androsov, A., Schröter, J., and Saynisch, J.

Subjects
550 - Earth sciences, Physics::Atmospheric and Oceanic Physics, Physics::Geophysics
Abstract

‘Oceanographic’ Earth rotation parameters (OERP) are calculated by subtracting atmospheric and hydrologic estimates from observed ERP. They are used to constrain a global ocean circulation model. Additionally mass variations derived by GRACE are used. We apply a sequential assimilation method of the type of reduced rank error subspace Kalman (square root) filters with weekly resolution. OERP mostly constrain the oceanic mass budget via the inertial rotational tensor while GRACE data determine mass redistribution in the ocean. On the other hand, ocean velocities are only loosely constrained by OERP.

Published
2011

2. Assimilation of Earth Rotation Parameters into a global ocean model: Governing physical mechanisms

Author

Saynisch, J., Wenzel, M., and Schröter, J.

Subjects
550 - Earth sciences, Physics::Atmospheric and Oceanic Physics, Physics::Geophysics
Abstract

The presented study focuses on that Earth rotation anomalies that are induced by the oceans. Changes in the oceanic current system and in the oceanic mass distribution alter the state of the Earth’s rotation which is characterized by the length of day and the tilt of the pole-to-pole axis. The aim of our study is to derive the respective governing physical mechanisms. Therefore, Earth rotation observations were assimilated with a global circulation model of the ocean. Although assimilation is a well established tool in climate science the assimilation of Earth rotation observations with a global ocean model is done here for the first time. Prior to the assimilation, Earth rotation observations had to be projected onto the angular momentum of the ocean. Non-oceanic contributions had to be removed. The result of the subsequent assimilation procedure is a time varying ocean model state, i.e. a trajectory, that reproduces the projected Earth rotation observations well. Afterwards, this trajectory was studied to understand the generation of Earth rotation deviations by the ocean. The governing physical mechanisms could be identified: Changes in length of day correlate to changes in global ocean mass. Changes in the ocean current system and in the spatial distribution of ocean mass dominate the oceanic generation of polar movement.

Published
2010

4. Sea Level Variations - Prospects from the Past to the Present

Author

Rothacher, M., Tilo Schöne, Schröter, J., Saskia Esselborn, Sidorenko, D., Ivchenko, V., Reinhardt, H., Richter, F., Sergei Rudenko, Schön, N., 4.1 Reservoir Technologies, 4.0 Chemistry and Material Cycles, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, and Earth Observing Satellites -2009, Geoengineering Centres, GFZ Publication Database, Deutsches GeoForschungsZentrum

Subjects
550 - Earth sciences
Published
2009

5. Joint combination of GPS site displacements, GRACE gravimetry and FESOM ocean bottom pressure - A summary of the results achieved within the SPP project JIGOG

Author

Kusche, J., Rietbroek, R., Flechtner, F., Dahle, C., Schröter, J., Brunnabend, S., Gravity Field and Gravimetry -2009, Geoengineering Centres, GFZ Publication Database, Deutsches GeoForschungsZentrum, and Earth Observing Satellites -2009, Geoengineering Centres, GFZ Publication Database, Deutsches GeoForschungsZentrum

Subjects
550 - Earth sciences
Published
2008

6. Joint combination of GPS site displacements, GRACE gravimetry and FESOM ocean bottom pressure - An outlook in the next phase of the SPP project JIGOG

Author

Kusche, J., Rietbroek, R., Flechtner, F., Dahle, C., Schröter, J., Brunnabend, S., Gravity Field and Gravimetry -2009, Geoengineering Centres, GFZ Publication Database, Deutsches GeoForschungsZentrum, and Earth Observing Satellites -2009, Geoengineering Centres, GFZ Publication Database, Deutsches GeoForschungsZentrum

Subjects
550 - Earth sciences
Published
2008

9. Mass Transport and Mass Distribution in the Earth System : Contribution of the New Generation of Satellite Gravity and Altimetry Missions to Geosciences; Proposal for a German Priority Research Program

Author

Ilk, K., Flury, J., Rummel, R., Schwintzer, P., Bosch, W., Haas, C., Schröter, J., Stammer, D., Zahel, W., Miller, H., Dietrich, R., Huybrechts, R., Schmeling, H., Wolf, D., Riegger, J., Bardossy, A., Güntner, A., 1.2 Global Geomonitoring and Gravity Field, 1.0 Geodesy and Remote Sensing, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, and Gravity Field and Gravimetry -2009, Geoengineering Centres, GFZ Publication Database, Deutsches GeoForschungsZentrum

Subjects
550 - Earth sciences
Published
2004

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