Institute of Computational Mathematics and Mathematical Geophysics

Международная Конференция по Математическим Методам в Геофизике «ММГ-2003»

Россия, Новосибирск, Академгородок 8-12 октября 2003 г.

Тезисы докладов

Математическое моделирование процессов в атмосфере и гидросфере

The Japan Sea Circulation Modelling with Data Assimilation and the Analysis of Deep Water Structure

Платов Г.А., Голубева Е.Н.

Inst. of Comput. Math. and Math. Geophysics (Novosibirsk)

The circulation pattern in Japan/East Sea (JES) resembles the most prominent features of the global ocean and includes cyclonic and anticyclonic gyre systems, a western boundary current that separates from the coast, and a deep homogenous water mass. There are also such phenomena as wind and thermahaline driven circulation, deep convection, and a variety of mesoscale eddies.

Yet little is known on the horizontal distribution of temperature and salinity in deep water because their horizontal variation is too small to be resolved. The Generalized Digital Environmental Model (GDEM) data set is used here for the analysis. of water masses in JES. This data set is created using about 7 million observations worldwide.

The basic method to investigate the problem is the so-called "nudging" scheme of data assimilation used along with numerical regional circulation model. The finite element model designed at the Institute of Computational Mathematics and Mathematical Geophysics was adopted to conduct a series of numerical experiments.

The numerical experiments are basically consisting of two periods: diagnostic and prognostic. The analysed set of experiments consists of a run with rough resolution 0.1x0.1 and constant horizontal diffusion coeffitient, another one with fine resolution 0.05x0.05 and a third experiment with isopycnal diffusion.

The general circulation results includes the following:
-- JES model runs show very detailed circulation pattern with major current system and eddy formations. In Particular, TWC, EKWC, LPC, NKCC, PFJ are all well reproduced and show seasonal variability.

-- Recognized eddies such as in Ulleung Basin, over Yamato Rise, in Japan Basin are clearly visible.

The structure of deep water is consistent with that available from direct mesurements, while its circulation is basically following topography isolines.

The work is supported by the RFBR № 02-05-64956.

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