https://cdn.earthdata.nasa.gov/conduit/upload/5182/KeywordsCommunityGuide_Baseline_v1_SIGNED_FINAL.pdf 24.9 2026-09-30T10:52:06.201Z https://gcmd.earthdata.nasa.gov/KeywordViewer/scheme/sciencekeywords/c692e8e4-b920-4eb5-86c3-b5f6121fec4b 2015-10-29 SODIUM Date=2017-03-15 User Id=mmorahan Entity=Definition Operation=INSERT System Note=insert Definition New Value=id: null text: The major ions, sodium (Na+), calcium (Ca2+), and chloride (Cl−), deposited in central Antarctica and preserved in ice cores originate from both marine and continental sources. They provide important proxy records, helping to reconstruct past climatic processes. language code: en Date=2015-10-29 User Id=aaleman Entity=BroaderRelation Operation=INSERT User Note=Insert Concept System Note=add broader relation New Value=SODIUM [c692e8e4-b920-4eb5-86c3-b5f6121fec4b,158437] - ICE CORE RECORDS [dba19648-3f52-48ba-b00b-8527d44c4d74,83895] The major ions, sodium (Na+), calcium (Ca2+), and chloride (Cl−), deposited in central Antarctica and preserved in ice cores originate from both marine and continental sources. They provide important proxy records, helping to reconstruct past climatic processes. 2017-03-15 13:36:49.0