Verification of SST Index

Parameter: SST NINO1+2 SST NINO.3 SST NINO3.4 SST NINO.4 SST NINO.WEST SST TNA SST TSA SST TAD SST IOBW SST WTIO SST SETIO SST IOD Initial date: ALL Jan (12/27) Feb (01/31) Mar (02/25) Apr (03/27) May (04/26) Jun (05/31) Jul (06/30) Aug (07/30) Sep (08/29) Oct (09/28) Nov (10/28) Dec (11/27) Score: ACOR RMSE

Error bars represent 95% confidence intervals estimated by a bootstrap method (1000 samplings).

• Definition of SST Indices

  Index	Description	Coordinates
  NINO1+2	Region off coasts of Peru and Chile	90W-80W, 10S-0
  NINO.3	Eastern/Central Tropical Pacific	150W-90W, 5S-5N
  NINO3.4	Central Tropical Pacific	170W-120W, 5S-5N
  NINO.4	Western/Central Tropical Pacific	160E-150W, 5S-5N
  NINO.WEST	Western Tropical Pacific	130E-150E, 0-15N
  TNA	Tropical North Atlantic	55W-15W, 5N-25N
  TSA	Tropical South Atlantic	30W-10E, 20S-0
  TAD	Tropical Atlantic Dipole	TNA-TSA
  IOBW	Indian Ocean Basin-Wide	40E-100E, 20S-20N
  WTIO	Western Tropical Indian Ocean	50E-70E, 10S-10N
  SETIO	Southeastern Tropical Indian Ocean	90E-110E, 10S-0
  IOD	Indian Ocean Dipole	WTIO-SETIO

• Model Predictions for NINO Regions