Joint GSTM and DFG SPP Symposium, GFZ-Potsdam 15-17 October 2007 ESA’s supporting Activities...

Joint GSTM and DFG SPP Symposium, GFZ-Potsdam 15-17 October 2007

ESA’s supporting Activities Related to Mass Transport in the Earth System

Roger HaagmansMission Science Division

European Space Agency


Swarm mission: 3D-Mantle Conductivity

(A. Jackson ETH Zürich, DNSC, CUP)

Swarm mission: gravity field potential(Christian Gerlach TUM and Pieter Visser DUT)

Studies related to future ideas


Swarm Satellite & Constellation

launch after 1.5 yr after 3 yrs after 4.5 yrs

launch after 4.5 yearsred (C) 530 km 500 kmyellow (A,B) 470 km 300 km

GPS Patch Antennas

Accelerometer

Magnetic package


3-D Electrical Conductivity of the Mantle

Time-varying external (inducing) magnetic fields produce induced electric currents in the conducting Earth

conductivity is sensitive to composition and temperature

These induced currents cause induced magnetic field variations


3-D Electrical Conductivity of the Mantle

Measured on ground or in space is the total (external + induced) magnetic field

Separation of external and induced fields enables determination of the electrical conductivity of the Earth’s interior

3D-Conductivity: hours to months periods, corresponding to app. 100 - 1000 km depth

Study team led by Andy Jackson at ETH Zürich together with DNSC Copenhagen and CUP (Prague)


Swarm and Gravity - Constellation

Observation: GPS-baseline between satellites

GRACE A-B: along-track (KBR, scalar)

Swarm A-B: cross-track (GPS, vector)

Swarm A-C: ~ radial (GPS, vector)

Geometry:mm/s10 2


Gravity Field Gradients

along-track cross-track

radial


along-track cross-track

along + cross radial

(1)

SH-Error Characteristics from Gradients in x,y and z


10 20 30 40 50 60 7010

-6

10-5

10-4

10-3

10-2

10-1

100

sh-degree

[m]

Degree RMS

Kaula

along

KBR

cross

radial

cross + along

Swarm

GRACE

CHAMP

Simulation results: 1 Month

A-B and A-C


Enabling Observation techniques for Future Solid Earth Missions.(2003)

Laser Doppler Interferometry Mission for Determination of the Earth’s gravity field. (2005)

Gravity Gradient sensor technology for future planetary missions. (2005)

Laser Interferometry High Precision Tracking for LEO. (2006)

Monitoring and Modelling Individual Sources of Mass Distribution and Transport in the Earth’s System by Means of Satellites (2007 18 months)

Courtesy: Thales Alenia Space

ESA studies: future gravity field concepts


Measurement and control elements of the SSI mission


Future Mission Concept

From: Ilk et al (2005)

Future Concepts?


Study Team

Geophysical

Modeling

Gravity

modeling

Mission

design

SRON Utrecht, NL R. Koop + +

DEOS Delft, NL P. Visser Solid earth + +

IAPG Munchen, DE T. Gruber

M. Thomas

Atmosphere

Oceans

+ +

GIS Stuttgart, DE N. Sneeuw + +

UL Luxemburg, LU T. van Dam Gravity +

AWI Bremerhaven, DE M. Losch Oceans

BGC Bristol, UK J. Bamber Ice

SCEG Newcastle, UK M. King Tides

UCG Utrecht, NL M. Bierkens Hydrology


Study logic

Geophysical Geophysical modellingmodelling

Gravity Gravity modellingmodelling

MissionMissiondesigndesign

GravityGravityretrievalretrieval

ObservabilityObservabilitySeparabilitySeparability


Geophysical modelling

Solid Earth

Tides Oceans Atmosphere

Ice Hydrology

Simulated “real” worldConsistentConsistent

CompatibleCompatibleCompleteComplete

CoupledCoupledCoordinatedCoordinated

DedicatedDedicatedSufficientSufficientRealisticRealistic


Current step: Gravity field modelling

Geophysical model EarthGeophysical model Earth

OrbitOrbitObservableObservableConstellationConstellation

Input gravityInput gravity

Observed gravity Observed gravity along orbitalong orbit+ observation error+ observation error


Conclusions

Future Mission requires solid preparation: coordination with complementary measurement techniques from other future satellites (like SMOS, CryoSat, Sentinels e.g.)

Activities in ESA complement DFG efforts and try to learn from existing analysis to understand the needs for a future mission concept

Joint GSTM and DFG SPP Symposium, GFZ-Potsdam 15-17 October 2007 ESA’s supporting Activities...

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