Time-Varying Gravity Models from GRACE Data

over NW Australia

Lily Yu, IIP/PEI Summer 2010Research School for the Earth Sciences,

ANU Image: NASA/JPL

Background• The geoid

• Observing ice melt and droughts

• The GRACE satellites

• The researchers: NASA/JPL, CSR at University of Texas, CNES/GRGS, GeoForschungsZentrum Potsdam (GFZ)

Error

The ProblemGravity field change, 2002-2008Gravity field change, 2008-2010

The Problem Gravity field change, 2002-2010

Murray-Darling Basin drought, 2001-present

?

The Problem with the Problem

River Monitoring Stations

Rainfall Monitoring Stations

Ground-based gravity surveys by WA Mining and Petroleum

GRGS ECMWF-based Dealiasing Products

GLDAS Hydrological Model

Further Inquiries

• Biomass (NVIS)

• National Water Commission’s future mapping projects

• Seismological data

Acknowledgements

• Paul Tregoning, supervisorRSES, ANU

• Emma-Kate PotterRSES, ANU

• Tony PurcellRSES, ANU

• Charlotte AllenRSES, ANU

• IIP/PEI