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  • ENSO PRECIPITATION INDEX (en)
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  • 2012-06-27 10:18:41.0 [mpmorahan] Move Concepts add broader relation (ENSO PRECIPITATION INDEX [d14d762c-4117-438a-9093-a098a0d0e4e6,22497] - PRECIPITATION INDICES [52347642-9786-4b59-be77-02e9f307118d,39663]); delete broader relation (null);
definition
  • The goal in constructing a precipitation-based measure of ENSO was to estimate the gradient of rainfall anomalies across the Pacific basin and ensure a good relationship with SST- and pressure-based indices. Areas were selected that represent the Maritime Continent (MC) (10° N – 10°S; 90° E – 150° E) and central to eastern Pacific (P) (10° N – 10° S; 160° E – 100° W). These regions capture the largest precipitation anomalies associated with the interannual variations of the Walker circulation and contain the largest correlations between GPCP and Nino 3.4 and SOI. Within P and MC the absolute magnitude of the largest correlation is over +0.6. Because of the spatially varying nature of rainfall, it was decided to use a moving block average which would capture the strongest zonal gradients within the equatorial Pacific. This procedure is unlike many fixed area average indices, and allows for a realistic meridional component of the precipitation gradient and migration of the ascending and descending branches of the Walker circulation. (en)
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