Nonlinear statistics reveals stronger tie between ENSO and the tropical hydrological cycle

Shiraj Khan, Auroop R. Ganguly, Sharba Bandyopadhyay, Sunil Saigal, David J. Erickson, Vladimir Protopopescu, George Ostrouchov

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

Cross-spectrum analysis based on linear correlations in the time domain suggested a coupling between large river flows and the El Niño-Southern Oscillation (ENSO) cycle. A nonlinear measure based on mutual information (MI) reveals extrabasinal connections between ENSO and river flows in the tropics and subtropics, that are 20-70% higher than those suggested so far by linear correlations. The enhanced dependence observed for the Nile, Amazon, Congo, Paraná, and Ganges rivers, which affect large, densely populated regions of the world, has significant impacts on inter-annual river flow predictabilities and, hence, on water resources and agricultural planning.

Original languageEnglish (US)
Article numberL24402
JournalGeophysical Research Letters
Volume33
Issue number24
DOIs
StatePublished - Dec 28 2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

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