= Gilbert Walker
{c}
<Gilbert Walker> used correlations among atmospheric observations to identify large-scale relationships, notably the opposed tropical pressure variations called the <Southern Oscillation>.<History of the SOI by National Oceanic and Atmospheric Administration>[Walker’s correlation studies and pressure indices]{ref}
The <Walker circulation> is named in his honour, but a pressure index and a circulation mechanism are different objects. Correlation identifies a recurring pattern; interpreting it requires the coupled physics of <trade winds>, ocean <temperature> and atmospheric motion. That distinction remains useful when a climate index is used for prediction.
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