Earth Oblateness (J2) Variations on Interannual-Decadal Time Scales: Constraints on Anelastic Effects

Details Earth Oblateness (J2) Variations on Interannual-Decadal Time Scales: Constraints on Anelastic Effects Earth Oblateness (J2) Variations on Interannual-Decadal Time Scales: Constraints on Anelastic Effects

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.g13a0633m&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #G13A-0633

Mathematics

Logic

1217 Time Variable Gravity (7223, 7230), 1218 Mass Balance (0762, 1223, 1631, 1836, 1843, 3010, 3322, 4532), 1223 Ocean/Earth/Atmosphere/Hydrosphere/Cryosphere Interactions (0762, 1218, 3319, 4550), 1621 Cryospheric Change (0776), 1641 Sea Level Change (1222, 1225, 4556)

Scientific paper

Observations of J2 began during the 1970s, enabling constraints to be placed on meridional mass transport within the Earth system that significantly predate the GRACE mission. Here, we use SLR solutions with the standard IERS solid Earth tides removed to examine the J2 budget for a 12-year period (1993-2005) during the satellite altimeter era. By accounting for variations arising from ocean mass redistribution and land hydrology using output from the ECCO and LaD models, we isolate J2 changes due to high-latitude land ice (HLLI) that peaked during the global warming that followed the large 1997-98 ENSO. Comparison of the HLLI-inferred global sea level changes with AVISO altimeter data corrected for steric and hydrological effects shows good agreement for an effective ablation latitude of 56 degrees, indicating a substantial contribution from sub-polar glaciers. The close correspondence obtained between residual oblateness and sea level variations argues against the presence of a strong, unmodeled anelastic response to the lunar nodal tide in our J2 data.

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