scholarly journals The annual cycle of the error of radioaltimetric measurements of the Black Sea level due to the nonlinearity of sea waves.

2021 ◽  
Vol 2021 (10) ◽  
Author(s):  
A.S. Zapevalov ◽  
Keyword(s):  
Sea Level ◽  
Black Sea ◽  
Gaussian Distribution ◽  
The Black Sea ◽  
Sea Waves ◽  
Average Value ◽  
Surface Data ◽  
Surface Wave Field ◽  
Non Gaussian

The variability of the error of the altimetric determination of the Black Sea level L due to the nonlinearity of sea waves is analyzed. The nonlinearity leads to deviations in the distribution of elevations of the reflecting radio wave surface from the Gaussian distribution. The error occurs due to the fact that the median of the non-Gaussian distribution of surface elevations does not coincide with the average surface level. The analysis is carried out within the framework of the Brown model, which describes the shape of an altimetric pulse reflected from the sea surface. Data from a numerical operational model of the surface wave field are used for the analysis. When calculating the shape of the reflected pulse of the altimeter, an additional predictor is introduced – the steepness of the waves. It is shown that there is a clearly defined annual variation of the error L. Its highest values are observed in winter, when the average monthly value reaches the level of 0.25 m, in summer this error decreases to 0.08-01 m. The maximum value calculated from the three-hour characteristics of surface waves is 0.4 m, the average value is 0.17 m.

CORRELATION OF THE BLACK, MARMARA AND AEGEAN SEAS DURING THE HOLOCENE

2017 ◽  
Author(s):  
Nikolay Esin ◽  
Nikolay Esin ◽  
Vladimir Ocherednik ◽  
Vladimir Ocherednik
Keyword(s):  
Mathematical Model ◽  
Sea Level ◽  
Black Sea ◽  
Aegean Sea ◽  
The Black Sea ◽  
Sea Level Changes ◽  
The Holocene

A mathematical model describing the change in the Black Sea level depending on the Aegean Sea level changes is presented in the article. Calculations have shown that the level of the Black Sea has been repeating the course of the Aegean Sea level for the last at least 6,000 years. And the level of the Black Sea above the Aegean Sea level in the tens of centimeters for this period of time.

scholarly journals Reconstruction of Diffusion Coefficients and Power Exponents from Single Lagrangian Trajectories

Fluids ◽  
2021 ◽  
Vol 6 (3) ◽  
pp. 111
Author(s):  
Leonid M. Ivanov ◽  
Collins A. Collins ◽  
Tetyana Margolina
Keyword(s):  
Black Sea ◽  
Diffusion Coefficients ◽  
Current System ◽  
Mean Square Displacement ◽  
California Current ◽  
The Black Sea ◽  
Mean Square ◽  
California Current System ◽  
The Mean ◽  
Non Gaussian

Using discrete wavelets, a novel technique is developed to estimate turbulent diffusion coefficients and power exponents from single Lagrangian particle trajectories. The technique differs from the classical approach (Davis (1991)’s technique) because averaging over a statistical ensemble of the mean square displacement (<X2>) is replaced by averaging along a single Lagrangian trajectory X(t) = {X(t), Y(t)}. Metzler et al. (2014) have demonstrated that for an ergodic (for example, normal diffusion) flow, the mean square displacement is <X2> = limT→∞τX2(T,s), where τX2 (T, s) = 1/(T − s) ∫0T−s(X(t+Δt) − X(t))2 dt, T and s are observational and lag times but for weak non-ergodic (such as super-diffusion and sub-diffusion) flows <X2> = limT→∞≪τX2(T,s)≫, where ≪…≫ is some additional averaging. Numerical calculations for surface drifters in the Black Sea and isobaric RAFOS floats deployed at mid depths in the California Current system demonstrated that the reconstructed diffusion coefficients were smaller than those calculated by Davis (1991)’s technique. This difference is caused by the choice of the Lagrangian mean. The technique proposed here is applied to the analysis of Lagrangian motions in the Black Sea (horizontal diffusion coefficients varied from 105 to 106 cm2/s) and for the sub-diffusion of two RAFOS floats in the California Current system where power exponents varied from 0.65 to 0.72. RAFOS float motions were found to be strongly non-ergodic and non-Gaussian.

scholarly journals Flexure due to the Messinian-Pontian sea level drop in the Black Sea

2009 ◽  
Vol 10 (10) ◽  
pp. n/a-n/a ◽  
Author(s):  
J. Bartol ◽  
R. Govers
Keyword(s):  
Sea Level ◽  
Black Sea ◽  
The Black Sea

Internal and external forcing of sea level variability in the Black Sea

2015 ◽  
Vol 45 (9-10) ◽  
pp. 2633-2646 ◽  
Author(s):  
Denis L. Volkov ◽  
Felix W. Landerer
Keyword(s):  
Sea Level ◽  
Black Sea ◽  
The Black Sea ◽  
External Forcing ◽  
Sea Level Variability

Oscillations of the Black Sea sea level in the north part of the coast

1999 ◽  
Vol 10 (2) ◽  
pp. 123-130
Author(s):  
Yu. I. Goryachkin ◽  
V. A. Ivanov ◽  
Yu. A. Stepanyants
Keyword(s):  
Sea Level ◽  
Black Sea ◽  
The Black Sea ◽  
The North ◽  
North Part

The Black Sea level trends from tide gages and satellite altimetry

2013 ◽  
Vol 38 (5) ◽  
pp. 329-333 ◽  
Author(s):  
A. A. Kubryakov ◽  
S. V. Stanichnyi
Keyword(s):  
Sea Level ◽  
Black Sea ◽  
Satellite Altimetry ◽  
The Black Sea

GNSS Reflectometry of the Black Sea Level in the Experiments at the Stationary Oceanographic Platform

2018 ◽  
Vol 73 (4) ◽  
pp. 422-427 ◽  
Author(s):  
A. M. Padokhin ◽  
G. A. Kurbatov ◽  
M. O. Nazarenko ◽  
V. E. Smolov
Keyword(s):  
Sea Level ◽  
Black Sea ◽  
The Black Sea ◽  
Gnss Reflectometry

scholarly journals Lack of marine entry into Marmara and Black Sea-lakes indicate low relative sea level during MIS 3 in the northeastern Mediterranean

2019 ◽  
Author(s):  
Anastasia G. Yanchilina ◽  
Celine Grall ◽  
William B. F. Ryan ◽  
Jerry F. McManus ◽  
Candace O. Major
Keyword(s):  
Sea Level ◽  
Black Sea ◽  
Global Ocean ◽  
The Black Sea ◽  
Marmara Sea ◽  
Independent Data ◽  
Relative Sea Level ◽  
Mis 3 ◽  
History Of ◽  
Marine Isotope Stage 3

Abstract. The Marine Isotope Stage 3 (MIS 3) is considered a period of persistent and rapid climate and sea level variabilities during which eustatic sea level is observed to have varied by tens of meters. Constraints on local sea level during this time are critical for further estimates of these variabilities. We here present constraints on relative sea level in the Marmara and Black Sea regions in the northeastern Mediterranean, inferred from reconstructions of the history of the connections and disconnections (partial or total) of these seas together with the global ocean. We use a set of independent data from seismic imaging and core-analyses to infer that the Marmara and Black Seas remained connected persistent freshwater lakes that outflowed to the global ocean during the majority of MIS 3. Marine water intrusion during the early MIS-3 stage may have occurred into the Marmara Sea-Lake but not the Black Sea-Lake. This suggests that the relative sea level was near the paleo-elevation of the Bosporus sill and possibly slightly above the Dardanelles paleo-elevation, ~80 mbsl. The Eustatic sea level may have been even lower, considering the isostatic effects of the Eurasian ice sheet would have locally uplifted the topography of the northeastern Mediterrranean.

Sign in / Sign up

Export Citation Format

Share Document