Mathematics – Logic
Scientific paper
Feb 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011geoji.184..651j&link_type=abstract
Geophysical Journal International, Volume 184, Issue 2, pp. 651-660.
Mathematics
Logic
1
Time Series Analysis, Satellite Geodesy, Time Variable Gravity, Earth Rotation Variations
Scientific paper
The change in the rate of the Earth's rotation, length-of-day (LOD), is principally the result of movement and redistribution of mass in the Earth's atmosphere, oceans and hydrosphere. Numerous studies on the LOD excitations have been made from climatological/hydrological assimilation systems and models of the general circulation of the ocean. However, quantitative assessment and understanding of the contributions to the LOD remain unclear due mainly to the lack of direct global observations. In this paper, the total Earth's surface fluids mass excitations to the LOD at seasonal and intraseasonal timescales are investigated from the Jet Propulsion Laboratory Estimating Circulation and Climate of the Ocean (ECCO) model, the National Centers for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR) reanalysis and the European Center for Medium-Range Weather Forecasts (ECMWF) Re-analysis (ERA)-Interim, GRACE-derived surface fluids mass and the spherical harmonics coefficient C20 from the satellite laser ranging (SLR) as well as combined GRACE+SLR solutions, respectively. Results show that the GRACE and the combined GRACE and SLR solutions better explain the geodetic residual LOD excitations at annual and semi-annual timescales. For less than 1 yr timescales, GRACE-derived mass is worse to explain the geodetic residuals, whereas SLR agrees better with the geodetic residuals. However, the combined GRACE and SLR results are much improved in explaining the geodetic residual excitations at intraseasonal scales.
Jin Shuanggen
Tapley Byron D.
Zhang Li-Jie
No associations
LandOfFree
The understanding of length-of-day variations from satellite gravity and laser ranging measurements does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The understanding of length-of-day variations from satellite gravity and laser ranging measurements, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The understanding of length-of-day variations from satellite gravity and laser ranging measurements will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1120005