Index Catalog // ScholarsArchive@OSU

Detecting aliased tidal errors in altimeter height measurements

Creator:: Schlax, Michael G. and Chelton, Dudley B.
Abstract:: A simple statistic is derived for quantifying the potential for the aliasing of tidal errors in a given linear estimate of sea surface height constructed from altimeter data. The existence of M2 tidal constituent errors in Geosat data processed in the traditional way (i.e., with orbit errors removed using least...
Resource Type:: Article

Aliased tidal errors in TOPEX/POSEIDON sea surface height data

Creator:: Schlax, Michael G. and Chelton, Dudley B.
Abstract:: Alias periods and wavelengths for the M2, S2, N2, K1, O1, and P1 tidal constituents are calculated for TOPEX/POSEIDON. Alias wavelengths calculated in previous studies are shown to be in error, and a correct method is presented. With the exception of the K1 constituent, all of these tidal aliases for...
Resource Type:: Article

The influence of mesoscale eddies on the detection of quasi-zonal jets in the ocean

Creator:: Schlax, Michael G. and Chelton, Dudley B.
Abstract:: Westward propagating Gaussian eddies with statistical characteristics estimated from altimeter observations but with purely random starting locations and times produce striated features in time-averaged maps of zonal velocity. The striations in these simulations have magnitudes and meridional scales comparable to those reported from time-averaged altimeter observations and model output in...
Resource Type:: Article

Correction to "Aliased tidal errors in TOPEX/POSEIDON sea surface height data”

Creator:: Schlax, Michael G. and Chelton, Dudley B.
Resource Type:: Article

Satellite Microwave SST Observations of Transequatorial Tropical Instability Waves

Creator:: Chelton, Dudley B., Wentz, Frank J., Genremann, Chelle L., de Szoeke, Roland A., and Schlax, Michael G.
Abstract:: Satellite measurements of sea-surface temperature (SST) by the TRMM Microwave Imager reveal previously unreported features of tropical instability waves (TIWs). In the Pacific, TIW-related variability is observed from the eastern boundary to at least 160°E. Cusp-shaped distortions of SST fronts and associated trains of anticyclonic vortices both north and south...
Resource Type:: Article

Seasonal variability in the Southwestern Atlantic

Creator:: Matano, Ricardo P., Schlax, Michael G., and Chelton, Dudley B.
Abstract:: The circulation of the southwestern Atlantic Ocean is dominated by the Subtropical Gyre and the confluence of the Brazil and Malvinas currents. Observations indicate that the latitude of this confluence changes seasonally, lying farther north during the austral winter than during the summer. This phenomenon has important consequences for the...
Resource Type:: Article

Spectral charactersitics of time-dependent orbit errors in altimeter height measurements

Creator:: Chelton, Dudley B. and Schlax, Michael G.
Abstract:: A mean reference surface and time-dependent orbit errors are estimated simultaneously for each exact-repeat ground track from the first two years of Geosat sea level estimates based on the Goddard Earth model (GEM)-T2 orbits. Motivated by orbit theory and empirical analysis of Geosat data, the time-dependent orbit errors are modeled...
Resource Type:: Article

Geosat altimeter observations of the surface circulation of the Southern Ocean

Creator:: Chelton, Dudley B., Schlax, Michael G., Witter, Donna L., and Richman, James G.
Abstract:: The variability of sea level and surface geostrophic currents in the Southern Ocean is investigated from the first 26 months of unclassified Geosat altimeter data (November 1986 to December 1988). Because of problems unique to Geosat, it has been necessary to develop new techniques for analyzing the height data. These...
Resource Type:: Article

Observations of Coupling between Surface Wind Stress and Sea Surface Temperature in the Eastern Tropical Pacific

Creator:: Chelton, Dudley B., Esbensen, Steven K., Schlax, Michael G., Thum, Nicolai, Freilich, Michael H., Wentz, Frank J., Gentemann, Chelle L., McPhaden, Michael J., and Schopf, Paul S.
Abstract:: Satellite measurements of surface wind stress from the QuikSCAT scatterometer and sea surface temperature (SST) from the Tropical Rainfall Measuring Mission Microwave Imager are analyzed for the three-month period 21 July–20 October 1999 to investigate ocean–atmosphere coupling in the eastern tropical Pacific. Oceanic tropical instability waves (TIWs) with periods of...
Resource Type:: Article

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

Creator:: Chelton, Dudley B. and Schlax, Michael G.
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...
Resource Type:: Article

The Midlatitude Resolution Capability of Sea Level Fields Constructed from Single and Multiple Satellite Altimeter Datasets

Creator:: Greenslade, Diana J. M., Chelton, Dudley B., and Schlax, Michael G.
Abstract:: A formalism recently developed for determining the effects of sampling errors on objectively smoothed fields constructed from an irregularly sampled dataset is applied to investigate the relative merits of single and multiple satellite altimeter missions. For small smoothing parameters, the expected squared error of smoothed fields of sea surface height...
Resource Type:: Article

The Accuracies of Crossover and Parallel-Track Estimates of Geostrophic Velocity from TOPEX/Poseidon and Jason Altimeter Data

Creator:: Schlax, Michael G. and Chelton, Dudley B.
Abstract:: Mean-squared errors of surface geostrophic velocity estimates from the crossover and parallel-track methods are calculated for altimeters in the Ocean Topography Experiment (TOPEX)/Poseidon and Jason orbits. As part of the crossover method analysis, the filtering properties and errors of cross-track speed estimates are examined. Velocity estimates from both the crossover...
Resource Type:: Article

Sampling Errors in Wind Fields Constructed from Single and Tandem Scatterometer Datasets

Creator:: Schlax, Michael G., Chelton, Dudley B., and Freilich, Michael H.
Abstract:: Sampling patterns and sampling errors from various scatterometer datasets are examined. Four single and two tandem scatterometer mission scenarios are considered. The single scatterometer missions are ERS (with a single, narrow swath), NSCAT and ASCAT (dual swaths), and QuikSCAT (a single, broad swath obtained from the SeaWinds instrument). The two...
Resource Type:: Article

Satellite Observations of Mesoscale Eddy-Induced Ekman Pumping

Creator:: Gaube, Peter, Chelton, Dudley B., Samelson, Roger M., Schlax, Michael G., and O'Neill, Larry W.
Abstract:: Three mechanisms for self-induced Ekman pumping in the interiors of mesoscale ocean eddies are investigated. The first arises from the surface stress that occurs because of differences between surface wind and ocean velocities, resulting in Ekman upwelling and downwelling in the cores of anticyclones and cyclones, respectively. The second mechanism...
Resource Type:: Article

Geographical Variability of the First Baroclinic Rossby Radius of Deformation

Creator:: Chelton, Dudley B., deSzoeke, Roland A., Schlax, Michael G., El Naggar, Karim, and Siwertz, Nicolas
Abstract:: Global 1° × 1° climatologies of the first baroclinic gravity-wave phase speed c¹ and the Rossby radius of deformation λ1 are computed from climatological average temperature and salinity profiles. These new atlases are compared with previously published 5° × 5° coarse resolution maps of λ₁ for the Northern Hemisphere and...
Resource Type:: Article

ScholarsArchive@OSU

Detecting aliased tidal errors in altimeter height measurements

Aliased tidal errors in TOPEX/POSEIDON sea surface height data

The influence of mesoscale eddies on the detection of quasi-zonal jets in the ocean

Correction to "Aliased tidal errors in TOPEX/POSEIDON sea surface height data”

Satellite Microwave SST Observations of Transequatorial Tropical Instability Waves

Seasonal variability in the Southwestern Atlantic

Spectral charactersitics of time-dependent orbit errors in altimeter height measurements

Geosat altimeter observations of the surface circulation of the Southern Ocean

Observations of Coupling between Surface Wind Stress and Sea Surface Temperature in the Eastern Tropical Pacific

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

The Midlatitude Resolution Capability of Sea Level Fields Constructed from Single and Multiple Satellite Altimeter Datasets

The Accuracies of Crossover and Parallel-Track Estimates of Geostrophic Velocity from TOPEX/Poseidon and Jason Altimeter Data

Sampling Errors in Wind Fields Constructed from Single and Tandem Scatterometer Datasets

Satellite Observations of Mesoscale Eddy-Induced Ekman Pumping

Geographical Variability of the First Baroclinic Rossby Radius of Deformation

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