https://cdn.earthdata.nasa.gov/conduit/upload/5182/KeywordsCommunityGuide_Baseline_v1_SIGNED_FINAL.pdf 23.9 2026-05-13T10:52:13.516Z https://gcmd.earthdata.nasa.gov/KeywordViewer/scheme/sciencekeywords/70ed535b-a591-411d-80ca-9eafe10b3be8 OCEANIC NINO INDEX Date=2012-06-25 User Id=mpmorahan Entity=BroaderRelation Operation=DELETE User Note=Move Concepts System Note=delete broader relation Old Value=OCEANIC NINO INDEX [70ed535b-a591-411d-80ca-9eafe10b3be8,23025] - OCEAN/SST INDICES [d72ccd5b-d662-4be0-a012-8fdd8a40a6fb,20931] Date=2012-06-25 User Id=mpmorahan Entity=NarrowerRelation Operation=INSERT User Note=Insert Concept System Note=add narrower relation New Value=OCEANIC NINO INDEX [70ed535b-a591-411d-80ca-9eafe10b3be8,23025] - ONI [fbae11f2-f8db-44b8-bcb6-55471dca13a2,39763] Date=2020-02-14 User Id=tstevens Entity=NarrowerRelation Operation=DELETE User Note=Remove Concepts System Note=delete narrower relation Old Value=OCEANIC NINO INDEX [70ed535b-a591-411d-80ca-9eafe10b3be8,86475] - ONI [fbae11f2-f8db-44b8-bcb6-55471dca13a2,86921] Date=2012-06-25 User Id=mpmorahan Entity=BroaderRelation Operation=INSERT User Note=Move Concepts System Note=add broader relation New Value=OCEANIC NINO INDEX [70ed535b-a591-411d-80ca-9eafe10b3be8,23025] - SEA SURFACE TEMPERATURE INDICES [b83895e9-bac8-49fe-bcf5-8fe4d8fcaa16,39747] Beginning in December 2008, the Oceanic Nino Index (ONI) is calculated using Version 3b of the extended reconstructed sea surface temperature (ERSST) dataset. More information on this new dataset is provided here (see refefrence link). This new monthly analysis replaces ERSST Version 3, which will no longer be updated. In the meantime, we are temporarily providing web links to the ONI based on ERSST.v3b and ERSST.v3. 2020-02-14 13:09:17.0