Use of TOPEX/Poseidon Sea Level Data for Ocean Analyses and ENSO Prediction: Some Early Results

Abstract In this study, two sets of Pacific Ocean analyses for 1993–96 were analyzed. Both analyses were produced with the assimilation of subsurface temperature data from expendable bathythermographs and tropical atmosphere–ocean moorings. In addition one analysis also assimilated sea level data from TOPEX/Poseidon. Sea level variability in the two analyses agreed well with each other, and both agree with tide gauge and altimetry data for 1993–95. However, beginning in late 1995 through 1996, large sea level differences of 5–8 cm were found in the tropical western Pacific between the two analyses. Furthermore, large sea level discrepancies were also found between dynamic height estimated from TAO temperatures and tide gauge–altimetry observations in the same region during 1996. These discrepancies are consistent with the sea level differences between the two model based analyses. Historical conductivity–temperature–depth data along 165°E near the equator were also analyzed and it was found that salinity ...

[1]  Ming Ji,et al.  Retrospective Analysis of the Salinity Variability in the Western Tropical Pacific Ocean Using an Indirect Minimization Approach , 2000 .

[2]  Richard W. Reynolds,et al.  USE OF SEA LEVEL OBSERVATIONS TO ESTIMATE SALINITY VARIABILITY IN THE TROPICAL PACIFIC , 1999 .

[3]  W. Kessler.  Interannual Variability of the Subsurface High Salinity Tongue South of the Equator at 165°E* , 1999 .

[4]  Christophe Maes,et al.  Estimating the influence of salinity on sea level anomaly in the ocean , 1998 .

[5]  Antonio J. Busalacchi,et al.  The Tropical Ocean‐Global Atmosphere observing system: A decade of progress , 1998 .

[6]  Ming Ji,et al.  An Improved Coupled Model for ENSO Prediction and Implications for Ocean Initialization. Part I: The Ocean Data Assimilation System , 1998 .

[7]  M. Mcphaden,et al.  Variability of surface layer hydrography in the tropical Pacific Ocean , 1997 .

[8]  Ming Ji,et al.  Impact of Data Assimilation on Ocean Initialization and El Niño Prediction , 1997 .

[9]  Yi Chao,et al.  A Comparison Between the TOPEX/POSEIDON Data and a Global Ocean General Circulation , 1995 .

[10]  Antonio J. Busalacchi,et al.  Open‐ocean validation of TOPEX/POSEIDON sea level in the western equatorial Pacific , 1995 .

[11]  John Derber,et al.  An Ocean Analysis System for Seasonal to Interannual Climate Studies , 1995 .

[12]  J. Picaut,et al.  Variability in equatorial Pacific sea surface topography during the verification phase of the TOPEX/POSEIDON mission , 1994 .

[13]  John L. Lillibridge,et al.  TOPEX/POSEIDON: The 2‐cm solution , 1994 .

[14]  D. Behringer.  Sea surface height variations in the Atlantic Ocean: A comparison of TOPEX altimeter data with results from an ocean data assimilation system , 1994 .

[15]  M. Latif,et al.  Simulation of ENSO Related Surface Wind Anomalies with an Atmospheric GCM Forced by Observed SST , 1990 .

[16]  J. Toole,et al.  Variability in the Western Equatorial Pacific Ocean during the 1986–87 El Niño/Southern Oscillation Event , 1990 .

[17]  John Derber,et al.  A Global Oceanic Data Assimilation System , 1989 .

[18]  Josef M. Oberhuber,et al.  An Atlas Based on the COADS Data Set: the Budgets of Heat Buoyancy and Turbulent Kinetic Energy at t , 1988 .

[19]  W. Hurlin,et al.  Simulation of the Seasonal Cycle of the Tropical Pacific Ocean , 1987 .

[20]  K. Wyrtki.  Sea level variations: Monitoring the breath of the Pacific , 1979 .

[21]  G. P. Cressman,et al.  AN OPERATIONAL OBJECTIVE ANALYSIS SYSTEM , 1959 .

[22]  Anthony Rosati,et al.  The sea surface pressure formulation of rigid lid models. Implications for altimetric data assimilation studies , 1995 .

[23]  M. Latif,et al.  On the benefit of sea level assimilation in the tropical Pacific , 1995 .

[24]  Michael J. McPhaden,et al.  TOGA-TAO and the 1991–93 El Niño Southern Oscillation Event , 1993 .

[25]  W. Kessler,et al.  Dynamic Heights and Zonal Geostrophic Transports in the Central Tropical Pacific during 1979–84 , 1987 .