1. Introduction

ECCO version 4 release 2 (ECCO v4 r2) is an ocean state estimate and solution of the MIT general circulation model (MITgcm) that covers the period from 1992 to 2011 [FCH+16]. It is a minor update of the original ECCO version 4 solution [FCH+15] that

1. benefits from a few additional corrections listed in [FCH+16]
2. is provided with additional model-data misfit and model budget output
3. has become easier to rerun than ECCO version 4 release 1.

The Downloading section provides an installation guide and links to various analysis tools. The Rerunning section provides simple instructions to rerun model solutions, which can be useful to generate additional output for example, and start experimenting with the model.