HR: 15:25h
AN: G33C-08    [Abstracts]
TI: Assessment of Current Estimates of Global and Regional Mean Sea Level Estimates from TOPEX and Jason-1 Altimetry Based on Revised Reference Frame and Orbits
AU: * Beckley, B D
EM: brianb@nemo.gsfc.nasa.gov
AF: SGT Inc., 7701 Greenbelt Road, Greenbelt, MD 20770, United States
AU: Lemoine, F G
EM: Frank.G.Lemoine@nasa.gov
AF: NASA Goddard Space Flight Center, Code 698, Planetary Geodynamics Branch, Greenbelt, MD 20771, United States
AU: Zelensky, N P
EM: nzelensky@sgt-inc.com
AF: SGT Inc., 7701 Greenbelt Road, Greenbelt, MD 20770, United States
AU: Luthcke, S B
EM: Scott.B.Luthcke@nasa.gov
AF: NASA Goddard Space Flight Center, Code 698, Planetary Geodynamics Branch, Greenbelt, MD 20771, United States
AU: Ray, R D
EM: Richard.D.Ray@nasa.gov
AF: NASA Goddard Space Flight Center, Code 698, Planetary Geodynamics Branch, Greenbelt, MD 20771, United States
AU: Labroue, S
EM: sylvie.lbroue@cls.fr
AF: CLS/Space Oceanography Division, 8-10 Rue Hermès, Parc Technologique du Canal, Ramonville St-Agne, 31520,
AB: The measurement of mean sea-level change from satellite altimetry requires extreme stability of the altimeter measurement system. In particular, the orbit and reference frame within which the altimeter measurements are situated, as well as the associated altimeter corrections, must be stable and accurate enough to permit robust mean sea level (MSL) estimates over an extended time period. The terrestrial reference frame is linked inseparably to the measurement of global mean sea level estimates from satellite altimetry and provides the context for the interpretation of the causes of current mean sea level trends. In an effort to adhere to cross mission consistency, we have generated the full time series of orbits for both TOPEX/Poseidon (TP) and Jason-1 through reduced dynamic methods based on the GGM02C GRACE derived gravity field within a consistent well defined ITRF2005 terrestrial reference frame. The recent release of the entire revised Jason-1 Geophysical Data Record (GDRB), and recalibration of the TOPEX microwave radiometer correction also require the further re-examination of TP/Jason-1 consistency issues. Here we present an assessment of these recent improvements to the accuracy of the TP/Jason-1 sea surface height time series, and evaluate the subsequent impact on global and regional mean sea level estimates.
DE: 1218 Mass balance (0762, 1223, 1631, 1836, 1843, 3010, 3322, 4532)
DE: 1225 Global change from geodesy (1222, 1622, 1630, 1641, 1645, 4556)
DE: 1241 Satellite geodesy: technical issues (6994, 7969)
DE: 1294 Instruments and techniques
DE: 4500 OCEANOGRAPHY: PHYSICAL
SC: Geodesy [G]
MN: 2007 Fall Meeting