El-Nino / La-Nina indices

Nino indices relate to different regions of the Pacific Ocean, specifically:

• Niño1 (far eastern equatorial Pacific): 5–10°S, 80–90°W
• Niño2 (far eastern equatorial Pacific): 0–5°S, 80–90°W
• Niño3 (eastern equatorial Pacific): 5°N–5°S, 150–90°W
• Niño3+4 (central equatorial Pacific): 5°N–5°S, 120–170°W
• Niño4 (western equatorial Pacific): 5°N–5°S, 160°E–150°W

In addition:

• IOD is the Indian Ocean Diode
• SOI is the Southern Ocean Index