NOAA NCEI's ENSO indicators include sea-surface temperature (SST), outgoing longwave radiation (OLR), the Southern Oscillation Index (SOI), and sea-level anomalies.
Notes on verification
NCEI's own metadata and news pages confirm the four listed indicators (SST, OLR, SOI, sea-level anomalies), with only a minor structural difference in how sea-level/zonal winds are grouped.
Sources
- El Niño Today | El Nino Theme Page - A comprehensive Resource (pmel.noaa.gov)
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4323421/ (ncbi.nlm.nih.gov)
- https://podaac.jpl.nasa.gov/dataset/NASA_SSH_ENSO_INDICATOR (podaac.jpl.nasa.gov)
- https://www.geographyrealm.com/remote-sensing-noaa-monitor-el-nino/ (geographyrealm.com)
- https://www.sciencedirect.com/science/article/abs/pii/S0022169424013386 (sciencedirect.com)