Water level fluctuations in the Plata Basin (South America) from Topex/Poseidon Satellite Altimetry

[1] Time series of water level in major rivers of the Plata basin are examined using altimetry data from the Topex/Poseidon satellite over the period 1993–2001. Ten sites are selected on the Parana, three on the Paraguay, one the Uruguay and seven on wetlands. It is confirmed that the seasonal cycle of river levels decreases in amplitude with increasing latitude of the site. The normalized time series for sites along the same river differ mainly by a time-lag corresponding to propagation speeds of about 0.1 ms−1. The interannual variability of the Lower Parana, with a strong peak in early 1998 and minima in early 1996 and 2000, shows the remote effects of El Nino/Southern Oscillation (ENSO). The variability of the Upper Parana and Paraguay shows similar ENSO impacts with smaller amplitudes after 1995, and the effects of regional features climate variability before that date (e.g. the South American monsoon). The results support the usefulness of satellite altimetry for a dense and continuous monitoring of river water levels.

[1]  V. Barros,et al.  Climate Variability in Southern South America Associated with El Niño and La Niña Events. , 2000 .

[2]  Robin T. Clarke,et al.  Measurement of river level variations with satellite altimetry , 1993 .

[3]  Carlos R. Mechoso,et al.  Interannual and Interdecadal Variability of the South Atlantic Convergence Zone , 2000 .

[4]  C. Birkett,et al.  The contribution of TOPEX/POSEIDON to the global monitoring of climatically sensitive lakes , 1995 .

[5]  Anny Cazenave,et al.  Interannual lake level fluctuations (1993–1999) in Africa from Topex/Poseidon: connections with ocean–atmosphere interactions over the Indian Ocean , 2002 .

[6]  C. Mechoso,et al.  Streamflow in Southeastern South America and the Southern Oscillation , 1992 .

[7]  C. Birkett,et al.  Contribution of the TOPEX NASA Radar Altimeter to the global monitoring of large rivers and wetlands , 1998 .

[8]  Carlos R. Mechoso,et al.  Interannual and Decadal Cycles in River Flows of Southeastern South America , 1998 .

[9]  K. Lau,et al.  Principal modes of interannual and decadal variability of summer rainfall over South America , 2001 .

[10]  Gérard Cochonneau,et al.  Temporal variations of river basin waters from Topex/Poseidon satellite altimetry. Application to the Amazon basin , 2001 .

[11]  C. Mechoso,et al.  El Niño-Southern Oscillation Impact on Rainfall in Uruguay , 1994 .

[12]  W. Collischonn,et al.  Further evidence of changes in the hydrological regime of the River Paraguay : part of a wider phenomenon of climate change? , 2001 .

[13]  P. Xie,et al.  Global Precipitation: A 17-Year Monthly Analysis Based on Gauge Observations, Satellite Estimates, and Numerical Model Outputs , 1997 .

[14]  J. Gomes,et al.  Precipitation Anomalies in Southern Brazil Associated with El Niño and La Niña Events , 1998 .

[15]  V. Barros,et al.  The Hydrologic Cycle of the La Plata Basin in South America , 2002 .

[16]  Charon Birkett,et al.  Indian Ocean Climate event brings floods to East Africa's lakes and the Sudd Marsh , 1999 .

[17]  W. Vargas,et al.  The Temporal Climatic Variability in the ‘Río De La Plata’ Basin Displayed by the River Discharges , 1998 .