Resolving mass flux at high spatial and temporal resolution using GRACE intersatellite measurements

Details Resolving mass flux at high spatial and temporal resolution using GRACE intersatellite measurements Resolving mass flux at high spatial and temporal resolution using GRACE intersatellite measurements

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3204310r&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 4, CiteID L04310

Mathematics

Logic

43

Geodesy And Gravity: Geopotential Theory And Determination (0903), Geodesy And Gravity: Satellite Geodesy: Technical Issues (6994, 7969), Geodesy And Gravity: Instruments And Techniques, Hydrology: Hydrological Cycles And Budgets (1218, 1655), Hydrology: Instruments And Techniques: Modeling

Scientific paper

The GRACE mission is designed to monitor mass flux on the Earth's surface at one month and high spatial resolution through the estimation of monthly gravity fields. Although this approach has been largely successful, information at submonthly time scales can be lost or even aliased through the estimation of static monthly parameters. Through an analysis of the GRACE data residuals, we show that the fundamental temporal and spatial resolution of the GRACE data is 10 days and 400 km. We present an approach similar in concept to altimetric methods that recovers submonthly mass flux at a high spatial resolution. Using 4° × 4° blocks at 10-day intervals, we estimate the mass of surplus or deficit water over a 52° × 60° grid centered on the Amazon basin for July 2003. We demonstrate that the recovered signals are coherent and correlate well with the expected hydrological signal.

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