The Accuracies of Smoothed Sea Surface Height Fields Constructed from Tandem Satellite Altimeter Datasets

Abstract A technique previously developed for assessing the effects of sampling errors on sea surface height (SSH) fields constructed from satellite altimeter data is extended to include measurement errors, thus providing estimates of the total mean-squared error of the SSH fields. The measurement error contribution becomes an important consideration with the greater sampling density of a coordinated tandem satellite mission. Mean-squared errors are calculated for a variety of tandem altimeter sampling patterns. The resolution capability of each sampling pattern is assessed from a subjectively chosen but consistent set of criteria for the mean value and the spatial and temporal inhomogeneity of the root-mean-squared errors computed over a representative large collection of estimation times and locations. For a mean mapping error threshold tolerance criterion of 25% of the signal standard deviation, the filter cutoff wavelength and period defining the resolution capability of SSH fields constructed from a ...

[1]  D. Stammer.  Global Characteristics of Ocean Variability Estimated from Regional TOPEX/POSEIDON Altimeter Measurements , 1997 .

[2]  Michael H. Freilich,et al.  Sampling Errors in Wind Fields Constructed from Single and Tandem Scatterometer Datasets , 2001 .

[3]  D. Chelton,et al.  Frequency domain diagnostics for linear smoothers , 1992 .

[4]  F. Bretherton,et al.  A technique for objective analysis and design of oceanographic experiments applied to MODE-73 , 1976 .

[5]  Detlef Stammer,et al.  Space-Borne Measurements of the Time-Dependent Geostrophic Ocean Flow Field , 1999 .

[6]  M. Cronin.  Eddy-Mean Flow Interaction in the Gulf Stream at 68°W. Part II: Eddy Forcing on the Time-Mean Flow , 1996 .

[7]  D. Stammer,et al.  Uncertainties in altimetry-based velocity estimates , 2002 .

[8]  D. Chelton,et al.  Eddy momentum flux and its contribution to the Southern Ocean momentum balance , 1992, Nature.

[9]  D. Chelton,et al.  The Resolution Capability of an Irregularly Sampled Dataset: With Application to Geosat Altimeter Data , 1994 .

[10]  D. Chelton,et al.  Surface Eddy Momentum Flux and Velocity Variances in the Southern Ocean from Geosat Altimetry , 1994 .

[11]  J. Pedlosky.  Geophysical Fluid Dynamics , 1979 .

[12]  Philip L. Richardson,et al.  Eddy kinetic energy in the North Atlantic from surface drifters , 1983 .

[13]  D. Chelton,et al.  The Speed of Observed and Theoretical Long Extratropical Planetary Waves , 1997 .

[14]  M. Lozier,et al.  The climatology of the North Atlantic , 1995 .

[15]  D. Chelton,et al.  Geographical Variability of the First Baroclinic Rossby Radius of Deformation , 1998 .

[16]  G. Veronis.  Large Scale Ocean Circulation , 1973 .

[17]  Diana J. M. Greenslade,et al.  The Midlatitude Resolution Capability of Sea Level Fields Constructed from Single and Multiple Satellite Altimeter Datasets , 1997 .

[18]  F. Bretherton,et al.  A technique for objective analysis and design of oceanographic experiments applied to MODE-73* , 2002 .

[19]  D. Chelton,et al.  The Accuracies of Crossover and Parallel-Track Estimates of Geostrophic Velocity from TOPEX/Poseidon and Jason Altimeter Data , 2003 .

[20]  R. Preisendorfer,et al.  Principal Component Analysis in Meteorology and Oceanography , 1988 .

[21]  C. Tai.  On the Spectral Ranges that Are Resolved by a Single Satellite in Exact-Repeat Sampling Mode , 1998 .

[22]  D. Chelton,et al.  Global Observations of Oceanic Rossby Waves , 1996, Science.

[23]  W. Cleveland,et al.  Locally Weighted Regression: An Approach to Regression Analysis by Local Fitting , 1988 .

[24]  G. Dibarboure,et al.  Mesoscale Mapping Capabilities of Multiple-Satellite Altimeter Missions , 1999 .