Improved estimates of the dynamical state of the North Pacific Ocean from a 4 dimensional variational data assimilation

Details Improved estimates of the dynamical state of the North Pacific Ocean from a 4 dimensional variational data assimilation Improved estimates of the dynamical state of the North Pacific Ocean from a 4 dimensional variational data assimilation

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30poce6m&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 16, pp. OCE 6-1, CiteID 1868, DOI 10.1029/2003GL017604

Physics

7

Meteorology And Atmospheric Dynamics: Numerical Modeling And Data Assimilation, Information Related To Geographic Region: Pacific Ocean, Oceanography: General: Water Masses

Scientific paper

A 4-dimensional variational data assimilation system has been used to better define the mean seasonal state of the North Pacific. The synthesis of available observational records and a sophisticated general circulation model produces a dynamically consistent time-varying dataset which exhibits realistic features of the global ocean circulation and requires no artificial sources or sinks for the temperature and salinity fields. The dataset enables us to clarify the water mass formation and movement processes. A sensitivity experiment using our system reveals that the origin of the North Pacific Intermediate Water can be traced back to the Okhotsk and Bering Seas in the subarctic region and to the subtropical Kuroshio region further south, consistent with recent observational findings. This result illustrates that the ocean state derived from our data assimilation has greater information and forecast potential than that obtained from earlier methods.

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