Create 003-reanalysis-datasets.md

doc/reference/decision-records/003-reanalysis-datasets.md

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+---
+title: "Adding reanalysis datasets as objects to the Benefit Tool"
+date: "2024-01-12"
+author: "Hazel Shapiro"
+status: "Accepted"
+---
+
+## Context
+
+Reanaylsis datasets draw from dozens of observing inputs. They are commonly used in Arctic research, and therefore,
+show up regularly in the Benefit Tool. While they are intermediate products, describing the inputs to reanalysis
+data products is cumbersome, challenging, and would overcrowd an individual diagram.
+
+## Decision
+
+Do not list observing system or data product inputs for reanalysis datasets.
+
+At some point, US AON may conduct an evaluation that is specific to a reanalysis dataset, but when they are being
+used as an intermediate product in other evaluations, it is more distracting than helpful to list out the inputs.
+
+## Consequences
+
+* Diagrams will be easier to read.
+* Diagrams will be missing information about how reanalysis datasets are derived.
+* Diagrams will be easier to create.
+
+## Consent
+
+* Hazel Shapiro
+* Sandy Starkweather