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EPIC data displays include line plots with overlay options, contour plots and animations, using the Plot Plus Graphics Package. All plots are labeled automatically and are of publication quality. It is easy for a user to combine several plots to form composites, such as the EPIC icon at the top of this page. Following are some example graphics for CTD, for time series, and for ADCP data. The GIF is generated by m2gif.

Example EPIC CTD gaphics
(click on image to see larger version)

Example EPIC Time Series gaphics
(click on image to see larger version)

Example EPIC Analysis of a combined CTD-ADCP section
in the Bering Sea in August 1991.
(click on image to see larger version)

(above left) Geostrophic velocity relative to 1500 db as determined from the CTD casts and (above right) upper ocean velocity as measured by the ADCP.

(left) Absolute geostrophic velocity referenced to the ADCP measurements. Notice that the absolute currents are stronger and penetrate deeper than deduced from geostrophy referred to 1500 db. The absolute geostrophic velocity maximum near 200 m is reduced relative to the fine-scale ADCP measurements by the inherent horizontal averaging between CTD stations.


Cokelet, E.D., M.L. Schall and D.M. Dougherty (1995): ADCP-referenced geostrophic circulation in the Bering Sea Basin. J. Phys. Oceanogr. (submitted).

EPIC graphics of Bering Sea Basin Circulation

ADCP (acoustic Doppler current profiler) vectors, satellite-tracked drifting buoy paths and hydrographic sections reveal the currents in the deep Bering Sea basin as measured by NOAA's Bering Sea FOCI (Fisheries Oceanography Coordinated Investigations) Program in August 1991.

Two strong current systems are evident. The Alaskan Stream lies just south of the Aleutian Islands and provides inflow to the Bering Sea through the Aleutian passes. It separated from the island arc at 174E forming a large clockwise eddy that reduced the inflow through Near Strait. The Kamchatka Current on the western side is the main outflow from the Bering Sea. Eddies entrain water from it, and weak currents and eddies comprise the basin's interior flow. (click on the image to see a larger version.)

This work used PPLUS and EPIC programs TRACKAV and MAPADCP.
Principal Investigators: E.D.Cokelet, R.K.Reed & P.J.Stabeno, NOAA/PMEL