Application of the Adaptive Statistics Method for Reanalysis of the Black Sea Fields Including Assimilation of the Temperature and Salinity Pseudo-Measurements in the Model

G. K. Korotaev, V. V. Knysh✉, P. N. Lishaev, S. G. Demyshev

Marine Hydrophysical Institute, Russian Academy of Sciences, Sevastopol, Russian Federation

✉ e-mail: vaknysh@yandex.ru

Abstract

To assimilate the thermohaline parameters’ pseudo-measurements in the model, applied is the method of adaptive statistics, the characteristic feature of which consists in adjusting the three-dimensional errors’ dispersions of the temperature and salinity forecast to the water circulation in the basin. The three-dimensional fields of the temperature and salinity pseudo-measurements are reconstructed in the 100–500 m layer based on the altimetry data and the Argo buoys’ limited measurements. The method is approved and validated by comparing the sea fields reconstructed in the reanalysis for 2012 with the Argo measurements. It is revealed that on the horizons 100, 113 and 125 m, the dispersions of differences (residuals) between the temperature pseudo-measurements and its model values somewhat exceed the model dispersion; whereas on the horizons within the 150–500 m layer, they are smaller. The daily standard deviation of the model level (relative to that reconstructed using the altimetry data) is smaller than the deviation calculated in the forecast; and during the March – September period, it is lower than the standard deviation resulted from the pseudo-measurements’ assimilation by the simplified method. Resolution of the mesoscale vortices in the currents’ fields is higher in case the method of adaptive statistics is used.

Keywords

adaptive statistics, dispersion of forecast errors, pseudo-measurements, validation, dispersion of residuals

Acknowledgements

The work was carried out within the framework of the state order on the topic No. 0827-2014-0011 "Studies of the regularities of the marine environment condition changes on the basis of operational observations and data from the system of now cast, prognosis and reanalysis of the state of marine areas" ("Operational Oceanography" code), and with partial support of RFBR, grant No. 16-05-00621.

Original russian text

Original Russian Text © The Authors, 2018, published in MORSKOY GIDROFIZICHESKIY ZHURNAL, Vol. 34, Iss. 1, pp. 40–56 (2018)

For citation

Korotaev, G.K., Knysh, V.V., Lishaev, P.N. and Demyshev, S.G., 2018. Application of the Adaptive Statistics Method for Reanalysis of the Black Sea Fields Including Assimilation of the Temperature and Salinity Pseudo-Measurements in the Model. Physical Oceanography, 25(1), pp. 36-51. doi:10.22449/1573-160X-2018-1-36-51

DOI

10.22449/1573-160X-2018-1-36-51

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