Land–sea temperature contrasts in the black sea region and their impact on surface wind variability

Kubryakov, A. A.; Шокуров, М. В.; Stanichny, S. V.; Anisimov, Anatolii

doi:10.1134/s0001433815040052

Cited by 9 publications

(3 citation statements)

References 6 publications

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“…3) [15]. Cyclonic curl is formed due to the impact of the along-shore winds with monsoon nature in winter period [16]. Direction change of the coastal line in this area leads to the sharp shift of wind direction and, consequently, to appearance of the local intense wind cyclonic vorticity area.…”

Section: Methodsmentioning

confidence: 99%

Dynamics of Batumi Anticyclone from the Satellite Measurements

Kubryakov¹,

Stanichny²

2015

PhO

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Eddy dynamics in the south-eastern part of the Black Sea is studied on the basis of satellite altimetry data and optical and infrared satellite imagery. Mesoscale variability using the recently developed methods of eddy automatic identification from a known altimetry-derived velocity fieldis investigated. The anticyclonic eddies in the basin intensifies in summer, and weakens in winter. Average radius of the long-lived anticyclones vary from 40-45 km in winter to ~60 km in summer-autumn season. In winter cyclonic eddies develop, particularly, a strong mesoscale cyclonic eddy is generated in the Batumi anticyclone area. It originates presumably from intense local cyclonic wind vorticity arising in this zone in winter. It is shown that, in most cases, Batumi anticyclone is not stationary. Having been formed in the coastal southeastern part of the Black Sea, it moves to the northwest at a speed 1 -5 cm/s reaching sometimes the basin northeastern part. Over 20-years period 8 anticyclones with lifetime exceeding 10 months were observed in two cases it exceeds one year. The Batumi anticyclone strongly impacts on the biooptical characteristics in the basin. During his lifetime it can capture the turbid coastal waters in his core for several times, which increase its reflectancecompare to surrounding waters. On the other hand, downwelling motions in the eddy can lead to the lowering of the reflectance(for example, during the coccolithophorids blooming).Keywords: eddy dynamics, synoptic eddies, satellite data, the Black Sea. Introduction. Quasi-stationary Batumi anticyclone situated in the southeastern part of the basin, is one of the most intense eddy formations observed in the Black Sea. Research of the last decades showed Batumi anticyclone to be nonstationary in the full sense of the word and to have the pronounced seasonal variability. Its formation and development starts in spring after the Rim Current (RC) weakening, the intensification -in summer and its breaking -in autumn [1,2]. Mesoscale dynamics in the south-east of the Black Sea can have rather complicated nature during the year: a great quantity of quite intense eddies of different signs are often observed here [3 -6]. Nevertheless Batumi anticyclone is considered to be one of the largest mesoscale formations in the basin. The researchers show it to form and break in the south-east of the Black Sea. It doesn't move along the basin, as opposed to eddies, formed in the other areas of the sea, that in their majority move in the cyclonic direction along the coast at a speed ~1 -15cm/s and significantly remote from their point of formation [3 -6].The works, dedicated to the research of Batumi anticyclone dynamics, are mainly based on the data of hydrological surveys [1,5,7] and satellite measurements in optical and infrared ranges [3 -6]. Having a number of advantages, these techniques, however, don't permit to obtain long continuous observations of eddy dynamics, as the possibility of performing continuous scientific ship expeditions is limited and the cloudine...

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Section: Methodsmentioning

confidence: 99%

Dynamics of Batumi Anticyclone from the Satellite Measurements

Kubryakov¹,

Stanichny²

2015

PhO

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“…Unfortunately, there are no long term measure ments of wind wave buoys in the Black Sea. The Black Sea is a small, almost closed basin; here, the wind dynamics is sufficiently complex, and the influence of shore effects is especially strong (see, for example, [8,9]). Up to now there have been almost no works on the validation of scatterometer data obtained for the Black Sea because of the small number of in situ measure ments.…”

Section: Introductionmentioning

confidence: 99%

Comparing satellite and meteorological data on wind velocity over the Black Sea

Garmashov

Kubryakov

Шокуров

et al. 2016

Izv. Atmos. Ocean. Phys.

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Wind velocity data obtained from in situ measurements at the Golitsyno 4 marine stationary plat form have been compared with QuikSCAT scatterometer data; NCEP, MERRA, and ERA Interim global reanalyses and MM5 regional atmospheric reanalysis. In order to adjust wind velocity measured at a height of 37 m above the sea surface to a standard height of 10 m with stratification taken into account, the Monin-Obukhov theory and regional atmospheric reanalysis data are used. Data obtained with the QuikSCAT scatter ometer most adequately describe the real variability of wind over the Black Sea. Errors in reanalysis data are not high either: the regression coefficient varies from 0.98 to 1.06, the rms deviation of the velocity amplitude varies from 1.90 to 2.24 m/s, and the rms deviation of the direction angle varies from 26° to 36°. Errors in determining the velocity and direction of wind depend on its amplitude: under weak winds (<3 m/s), the velocity of wind is overestimated and errors significantly increase in determining its direction; under strong winds (>12 m/s), its velocity is underestimated. The influence of these errors on both spatial and temporal estimates of the charac teristics of wind over the Black Sea is briefly considered.

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“…This was done through observation and model runs of present-day and future climates with the regional climate model RACMO2 (Regional Atmospheric Climate Model). The variability of land-sea surface temperature contrasts in the Black Sea region and its relation with wind dynamics in coastal areas were investigated using satellite measurements and the results of high-resolution regional models by Kubryakov et al [12]. In the Baltic Sea area, the cloud amount simulated by the regional climate model BALTIMOS (BALTEX Integral Model System, where BALTEX stands for the Baltic Sea Experiment) was compared with satellite observations by Reuter and Fischer [13], and no significant trend in total cloud amount was observed either from the model or from the satellite.…”

Section: Introductionmentioning

confidence: 99%

Specific Features of the Land-Sea Contrast of Cloud Liquid Water Path in Northern Europe as Obtained from the Observations by the SEVIRI Instrument: Artefacts or Reality?

Kostsov,

Ionov

2023

Meteorology

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Liquid water path (LWP) is one of the most important cloud parameters and is crucial for global and regional climate modelling, weather forecasting, and modelling of the hydrological cycle and interactions between different components of the climate system: the atmosphere, the hydrosphere, and the land surface. Space-borne observations by the SEVIRI instrument have already provided evidence of the systematic difference between the cloud LWP values derived over the land surface in Northern Europe and those derived over the Baltic Sea and major lakes during both cold and warm seasons. In the present study, the analysis of this LWP land-sea contrast for the period 2011–2017 reveals specific temporal and spatial variations, which, in some cases, seem to be artefacts rather than of natural origin. The geographical objects of investigation are water bodies and water areas located in Northern Europe that differ in size and other geophysical characteristics: the Gulf of Finland and the Gulf of Riga in the Baltic Sea and large and small lakes in the neighbouring region. The analysis of intra-seasonal features has detected anomalous conditions in the Gulf of Riga and the Gulf of Finland, which show up as very low values of the LWP land-sea contrast in August with respect to the values in June and July every year within the considered time period. This anomaly is likely an artefact caused by the LWP retrieval algorithm since the transition from large LWP contrast to very low contrast occurs sharply, synchronically, and at a certain date every year at different places in the Baltic Sea.

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Land–sea temperature contrasts in the black sea region and their impact on surface wind variability

Cited by 9 publications

References 6 publications

Dynamics of Batumi Anticyclone from the Satellite Measurements

Dynamics of Batumi Anticyclone from the Satellite Measurements

Comparing satellite and meteorological data on wind velocity over the Black Sea

Specific Features of the Land-Sea Contrast of Cloud Liquid Water Path in Northern Europe as Obtained from the Observations by the SEVIRI Instrument: Artefacts or Reality?

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