[{"key":"oni","label":"Oceanic Niño Index (ONI)","units":"°C anomaly","source":"NOAA CPC","source_url":"https://www.cpc.ncep.noaa.gov/data/indices/oni.ascii.txt"},{"key":"nino12","label":"Niño 1+2 SST Anomaly","units":"°C anomaly","source":"NOAA CPC","source_url":"https://www.cpc.ncep.noaa.gov/data/indices/ersst5.nino.mth.91-20.ascii"},{"key":"nino3","label":"Niño 3 SST Anomaly","units":"°C anomaly","source":"NOAA CPC","source_url":"https://www.cpc.ncep.noaa.gov/data/indices/ersst5.nino.mth.91-20.ascii"},{"key":"nino34","label":"Niño 3.4 SST Anomaly","units":"°C anomaly","source":"NOAA CPC","source_url":"https://www.cpc.ncep.noaa.gov/data/indices/ersst5.nino.mth.91-20.ascii"},{"key":"nino4","label":"Niño 4 SST Anomaly","units":"°C anomaly","source":"NOAA CPC","source_url":"https://www.cpc.ncep.noaa.gov/data/indices/ersst5.nino.mth.91-20.ascii"},{"key":"soi","label":"Southern Oscillation Index (SOI)","units":"standardized","source":"NOAA CPC","source_url":"https://www.cpc.ncep.noaa.gov/data/indices/soi"},{"key":"roni","label":"Relative Oceanic Niño Index (RONI)","units":"°C anomaly","source":"NOAA CPC","source_url":"https://www.cpc.ncep.noaa.gov/data/indices/RONI.ascii.txt"},{"key":"mei_v2","label":"Multivariate ENSO Index (MEI.v2)","units":"standardized","source":"NOAA PSL","source_url":"https://psl.noaa.gov/enso/mei/data/meiv2.data"},{"key":"eqsoi","label":"Equatorial Southern Oscillation Index","units":"standardized","source":"NOAA CPC","source_url":"https://www.cpc.ncep.noaa.gov/data/indices/reqsoi.for"},{"key":"wpac850","label":"Trade Winds 850 hPa — West Pacific","units":"standardized","source":"NOAA CPC","source_url":"https://www.cpc.ncep.noaa.gov/data/indices/wpac850"},{"key":"cpac850","label":"Trade Winds 850 hPa — Central Pacific","units":"standardized","source":"NOAA CPC","source_url":"https://www.cpc.ncep.noaa.gov/data/indices/cpac850"},{"key":"epac850","label":"Trade Winds 850 hPa — East Pacific","units":"standardized","source":"NOAA CPC","source_url":"https://www.cpc.ncep.noaa.gov/data/indices/epac850"},{"key":"wwv","label":"Warm Water Volume Anomaly","units":"10¹⁴ m³","source":"NOAA PMEL/GTMBA","source_url":"https://www.pmel.noaa.gov/tao/wwv/data/wwv.dat"},{"key":"nino34_long","label":"Niño 3.4 (ERSST v6, 1850–present)","units":"°C anomaly","source":"NOAA PSL / NCEI ERSST v6","source_url":"https://downloads.psl.noaa.gov/Datasets/noaa.ersst.v6/"}]