A Twenty - Year Dynamical Oceanic Climatology : 1994 - 2013 . 1 Part 1 : Active Scalar Fields : Temperature , Salinity , Dynamic 2 Topography , Mixed - Layer Depth , Bottom Pressure

11 The World Ocean Circulation Experiment (WOCE) was created to produce the first cli12 matologically useful picture of the ocean circulation and its low-frequency variability. This 13 goal is addressed here from the state estimate of the Estimating the Circulation and Climate 14 of the Ocean (ECCO) consortium, which uses almost all of the data obtained during WOCE 15 and its aftermath along with the much improved general circulation modeling capabilities. 16 A dynamically and data-consistent, time-evolving, state estimate is available depicting the 17 ocean and its ice-cover over a 23-year time-span, globally, from the sea surface to the sea 18 floor. The resulting time-dependent 20-year long climatology includes temperature, salinity, 19 surface elevation, bottom pressure, sea-ice, and three components of velocity. Accompany20 ing the state estimate are modified estimates of meteorological forcing-fields, ocean interior 21 mixing coefficients, and initial conditions. Much spatial structure persists through the two22 decade averaging. Results here are primarily pictorial in nature, intended to give the wider 23 community a sense of what is now available and useful and where more detailed analysis 24 would be fruitful. An extended reference list is included. 25 ∗For corrections, additions, comments and criticisms please email [email protected]. †1. AER, Inc., 2. Jet Propulsion Laboratory, 3. MIT, 4. U. Texas Austin, 5. U. South Florida, 6. Harvard U., 7. Cambridge Climate Institute, 8. George Mason U.