Study of long-term variability of Black Sea dynamics on the basis of circulation model assimilation of remote measurements

Dorofeev, Yu. G.; Sukhikh, L. I.

doi:10.1134/s0001433817020025

Cited by 19 publications

(32 citation statements)

References 11 publications

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“…To solve the problem, the reanalysis of the Black Sea hydrophysical fields (1993-2012) on the basis of circulation model variant previously used in [4] was performed. For more accurate description of thermodynamic processes in the active sea layer, especially the vertical exchange processes, a turbulent model was added to the abovementioned circulation one.…”

Section: Methodsmentioning

confidence: 99%

“…For assimilating the data on sea level anomaly all available satellite altimetry data over the reanalysis period from NASA, AVISO and SL TAC archives were used. Assimilation procedures in this work completely correspond to the ones applied before in [4]. These methods are based on optimal interpolation and relaxation of model fields to the existing measurement data.…”

Section: Methodsmentioning

confidence: 99%

“…The obtained results were compared with the reanalysis performed by the model containing 35 computational levels. In this model vertical turbulent diffusion was parameterized by the coefficients depending on the depth and time, and vertical viscosity -by a constant coefficient of turbulent viscosity [4,5].…”

Section: Methodsmentioning

confidence: 99%

“…In what follows, for brevity, we will denote reanalysis, the results of which are described in [4,5], as P1, and reanalysis in the circulation model into which a turbulent model is added, as P2.…”

Section: Methodsmentioning

confidence: 99%

“…In [1][2][3], the reanalysis was carried out on the basis of data assimilation of hydrological survey of temperature and salinity and covered the period from early 70s to early 90s. In [4,5] the Black Sea dynamics over 20 years (1993)(1994)(1995)(1996)(1997)(1998)(1999)(2000)(2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012) was studied on the basis of satellite data assimilation. During these years, a small amount of hydrological survey was performed in the Black Sea, but remote sensing data such as sea level elevation anomalies and surface temperature became available.…”

Section: Introductionmentioning

confidence: 99%

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Influence of the Vertical Turbulent Exchange Parameterization on the Results of Reanalysis of the Black Sea Hydrophysical Fields

Sukhikh¹,

Dorofeyev²

2018

PhO

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Comparative analysis of two simulations of the Black Sea hydrophysical fields' long-term variability in 1993-2012 is performed. Two reanalyses are done using various methods of parametrizing the vertical turbulent exchange in the circulation model. The first variant implies a simple parameterization including the constant coefficient of vertical turbulent viscosity and the coefficient of vertical turbulent diffusion in a form of climatic profiles. The second simulation includes the turbulence model of the Mellor-Yamada type to parametrize the vertical exchange processes. Having been compared, the reanalysis results and the measurement data show that application of the turbulent model for parametrizing the vertical exchange yields a better description of the Black Sea water thermohaline structure. In particular, structure of the summer seasonal thermocline and location of the main halocline (in both of them maximum deviations of the model temperature and salinity from the in-situ measurement data are observed) are reproduced more accurately. Different methods of parametrizing the momentum vertical exchange influence the horizontal circulation vertical structure.The first variant of simulation shows that a significant part of the currents' kinetic energy is concentrated in the thin 10-m layer, and this fact affects the circulation features of shallow water on the northwestern shelf; whereas the simulation based on the turbulent model implies more intensive transfer of the kinetic energy to the lower layers. The carried out investigation shows that the results of the hydrophysical fields' reanalysis depend on accurate description of the thermodynamic processes in the sea upper layer and the vertical turbulent exchange ones, in particular.Acknowledgements: the investigation is carried out within the framework of the state task on the theme No. 0827-2018-0002 "Development of the methods of operational oceanology based on the inter-disciplinary studies of the marine environment formation and evolution processes, and mathematical modeling using the data of remote and direct measurements" (code "Operational oceanology") (numerical modeling with satellite data assimilation) under support of the RSF No.17-77-30001 "New methods and supercomputer technologies of the World Ocean and Arctic basin nowcast and forecast" (analysis of the obtained results).For citation: Sukhikh, L.I. and Dorofeyev, V.L., 2018. Influence of the vertical turbulent exchange parameterization on the results of reanalysis

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%