In the Copernicus Marine Data Store, there are several type of products and datasets (a dedicated article will be published soon to explicitly deal with each one).

Among them, there are modeling products, divided in four categories:

  1. Re-analysis

  2. Analysis

  3. Hindcast

  4. Forecast

Let's focus on the two first items with a simple definition (extracted from Copernicus Marine BlueBook)


Analysis

An analysis is a snapshot of the state of the ocean at any given time. It is done using a model (that is typically under development, with changes occurring regularly every 2-5 years or so), data and observations to provide a best fit produced on the fly. An analysis is generally used as a starting point for forecasts to make them as close to reality as possible (i.e. with all the data available).

Re-analysis

An oceanographic reanalysis consists in modelling the state of the ocean over a long period of time (several years, decades) while correcting it with the best available past observations, obtained from satellite sensors (e.g. sentinel-3, jason2 etc...) or in-situ measurements (e.g. argo profiling floats, gliders etc..)


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