Microsoft Word Document

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Science and Application Impact Study 2
Geostrophic Current (OCCAM)
OCCAM
lt 250 km
lt 1000 km
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Science and Application Impact Study 2 Conclusion
Knowledge of the marine geoid to 1 cm
at a scale of 100 km will ensure mapping of
short-wavelength features (100-200 km) of the
dynamic topography to 1-2 cm accuracy on a
global basis identification of practically all
features within the mean geostrophic current
field by the improved knowledge of the dynamic
topography better understanding of the role of
the positions, strengths and dynamics of the
short-spatial scale fronts and jets in
controlling and influencing the ocean
circulation In turn greater confidence in the
construction of the next generation ocean and
climate models is achieved.
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Science and Application Impact Study 3 Ocean
Flux Estimates
study areas - several sections in the South
Atlantic input data - dynamic ocean
topography from hydrography inverse model
assimilating hydrographic data and - altimeter
derived mean sea surface, - best available
gravity field model (EGM96) - GOCE simulated
geoid error field
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Science and Application Impact Study 3 Ocean
Flux Estimates
Mean dynamic topography obtained from inverse
model, T/P and EGM96 Sections with transport
estimates are marked.
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Science and Application Impact Study 3 Results
reduction in transport uncertainty when the
inverse model is constrained by simulated GOCE
geoid height error spectrum instead of best
available gravity field model from EGM96
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Science and Application Impact Study 3 Conclusion
Knowledge of the marine geoid to 1 cm at a scale
of 100 km will ensure significant reduction
in oceanic transport uncertainties - in
general most prominent in the upper ocean -
as large as 30-50 for the South Atlantic -
up to 60 in narrow and intense current
paths - in absolute terms this typically
range from 1 to 4 Sv with maxima of the order
of 10 Sv (1Sv 106 m3/s)
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Science and Application Oceanography - Summary
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Science and Application Ice Sheets
The GOCE gravity field model with an an accuracy
of 1 mgal at a scale of 100 km will advance
the capabilities to estimate polar ice sheet
dynamics and volume changes through
combination of bedrock topography derived
from space gravity and ice sheet surface
topography
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Science and Application Geodesy

• The GOCE derived gravity field model and geoid
  will provide
• unified global height systems for various
  sciences applications
• levelled heights from the combination of
  GPS and the geoid model
• inertial navigation freed of gravity induced
  errors
• better satellite orbits

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Science and Application Geodesy - Levelled Heights
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Science and Application Geodesy - Summary
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Science and Application Sea Level Change Study
Tidal Records
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Science and Application Sea Level Change
Conclusion
solid earth
sea level
geodesy
ice
ocean
gravity anomalies
geoid
gravity anomalies
geoid




tide gauges altimetry
positioning (GPS)
ice topography
ocean altimetry
post glacial Rebound mean ocean circulation ice
mass balance orbits unified height systems
levelled heights unified height system
bedrock topography
mean ocean circulation
mass balance of ice sheets
constraints on mass heat transport
anomalous density structure
gravity anomalies
INS orbits