The gravity field reflects the anomalous density structures in the Earths interior in comparison to - PowerPoint PPT Presentation

1 / 17
About This Presentation
Title:

The gravity field reflects the anomalous density structures in the Earths interior in comparison to

Description:

The Four Candidate Earth Explorer Core Missions consultative ... seismic tomography. petrological data. model runs: run 1: convergence from model (no GOCE data) ... – PowerPoint PPT presentation

Number of Views:111
Avg rating:3.0/5.0
Slides: 18
Provided by: gfy8
Category:

less

Transcript and Presenter's Notes

Title: The gravity field reflects the anomalous density structures in the Earths interior in comparison to


1
Science and Application The dual role of the
Earths gravity field
The gravity field reflects the anomalous density
structures in the Earths interior in comparison
to an idealized body in hydrostatic
equilibrium. The geoid coincides with a
hypothetical ocean surface at rest. All
topography (on land, ice sheet and the ocean) is
referred to it.
2
Science and Application The Gravity Field Mirror
3
Science and Application The Geoid Reference
Surface
4
Science and Application Solid Earth Physics
The GOCE derived gravity field with an accuracy
of 1 mgal at a scale of 100 km will
provide new understanding of the physics of
the Earths interior including geodynamics and
anomalous density structure associated with the
continental lithosphere, mantle composition and
rheology and uplifting /subduction processes.
5
Science and Application Interior Structure and
Geodynamic Processes
6
Science and Application Limitation of Seismic
Data only
7
Science and Application Impact Study 1 Seismic
Risk
  • input data
  • 2D viscoelastic model (stress distribution)
  • earthquake distribution
  • seismic tomography
  • petrological data
  • model runs
  • run 1 convergence from model (no GOCE data)
  • run 2 asthenospheric upwelling added (GOCE
    added)
  • run 3 gravitational sinking of slab due to
    load (GOCE added)

8
Science and Application Impact Study 1 Seismic
Risk (Tuscany)
Study Area
Model Setup
9
Science and Application Impact Study 1 Results
Run 1
Run 3
Run 2
10
Science and Application Impact Study 1 Conclusion
Inversion of gravity field data from GOCE
will impose constraint on interior density
structure significantly improve
understanding of processes controlling
earthquake nucleation in seismic active regions
11
Science and Application Solid Earth Physics -
Summary
12
Science and Application Oceanography
The GOCE derived geoid with a 1 cm accuracy at a
scale of 100 km will meet an essential
requirement for the determination, in
combination with satellite altimetry, of the
absolute ocean circulation and the
associated transport of mass, heat and other
properties
13
Science and Application Limitation of Altimetry
14
Science and Application Mean Dynamic Ocean
Topography
Below about 1000 km the Mean Dynamic
Topography is poorly known
15
Science and Application Existing Geoid Knowledge
Above degree 20-25 (1000 km) the geoid error
becomes dominant
16

Science and Application Absolute Ocean Circulation
  • Knowledge of this circulation is essential for
  • study of the impact of the shorter-scale
    (100-200 km) mean flows on climate
  • computation of heat and mass fluxes through
    basin-scale ocean sections
  • study of non-linear oceanic dynamics and
    interdependence between the mean and variable
    parts of the flow
  • Improved knowledge in these areas will
  • advance the data assimilation schemes for ocean
    forecasting
  • advance the Earth System Models for climate and
    sea level change studies

17
Science and Application Impact Study 2 Mean
Dynamic Topography
  • Short spatial scales
  • - 1/12 MICOM ocean model of North Atlantic
  • ocean topography simulated at wavelengths of
  • lt 1000 km, lt 250 km and lt 100 km
  • - 1/8 OCCAM global model
  • ocean topography simulated at wavelengths of
  • lt 1000 km and lt 250 km
Write a Comment
User Comments (0)
About PowerShow.com