Evolution of air–sea interaction parameters during the temperature front passage: The measurements on an oceanographic platform

Репина, И. А.; Chukharev, A. M.; Goryachkin, Yu. N.; Komarova, N. Yu.; Pospelov, M.N.

doi:10.1016/j.atmosres.2008.11.007

Cited by 6 publications

(6 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Data from these layers are indicated by dark grey points. Light grey symbols show atmospheric data from the following sources: research observatory Tiksi in East Siberia (Grachev et al, 2018) near the Arctic Ocean coast; offshore oceanographic platform in the Black Sea (Repina et al, 2009); and acoustic soundings over arid-steppe in Republic of Kalmykia in Southern Russia (Vazaeva et al, 2017). In spite of inevitable heterogeneity, non-stationarity and other side effects, atmospheric data correlate quite well with DNS data.…”

Section: Dissipation Rate In Steady-state Stably Stratified Sheared mentioning

confidence: 85%

Dissipation rate of turbulent kinetic energy in stably stratified sheared flows

Zilitinkevich¹,

Druzhinin²,

Glazunov³

et al. 2018

Preprint

View full text Add to dashboard Cite

<p><strong>Abstract.</strong> Over the years, the problem of dissipation rate of turbulent kinetic energy (TKE) in stable stratification remained unclear because of the practical impossibility to directly measure the process of dissipation that takes place at the smallest scales of turbulent motions. Poor representation of dissipation causes intolerable uncertainties in turbulence-closure theory and, thus, in modelling stably stratified turbulent flows. We obtain theoretical solution to this problem for the whole range of stratifications from neutral to limiting stable; and validate it via (i) direct numerical simulation (DNS) immediately detecting the dissipation rate and (ii) indirect estimates of dissipation rate retrieved via the TKE-budget equation from atmospheric measurements of other components of the TKE-budget. The proposed formulation of dissipation rate will be of use in any turbulence-closure models employing the TKE budget equation and in problems requiring precise knowledge of the high-frequency part of turbulence spectra in atmospheric chemistry, aerosol science and microphysics of clouds.</p>

show abstract

Section: Dissipation Rate In Steady-state Stably Stratified Sheared mentioning

confidence: 85%

Dissipation rate of turbulent kinetic energy in stably stratified sheared flows

Zilitinkevich¹,

Druzhinin²,

Glazunov³

et al. 2018

Preprint

View full text Add to dashboard Cite

show abstract

“…The largest part of data was collected during upwelling events in 2005 [ 9 ], while in 2009 and 2011, the data were collected in October during strong storms and vertical convection. The data were collected with instruments presented in Table 1.…”

Section: Instrumentation and Methodsmentioning

confidence: 99%

“…1) is located offshore in Crimea (near town Katsiveli, 44°23′38″ N, 33°59′15″ E). It was built in 1980 and since then remains a unique research infrastructure to run a variety of meteorological and oceanographic studies in the Black Sea [8][9][10][11]. The platform's location at a distance of approximately 450-600 m from the coast and the water depth at this location (about 30 m) make it a unique observational point to collect the data in the coastal zone in an area that is usually unresolved in remote sensing data sets.…”

Section: Introductionmentioning

confidence: 99%

Air–sea interaction under low and moderate winds in the Black Sea coastal zone

Репина¹,

Artamonov²,

Chukharev³

et al. 2012

Estonian J. Eng.

View full text Add to dashboard Cite

This paper reports the results of field experiments performed at an offshore oceanographic platform in the Black Sea during spring and fall seasons 2005-2011. Observations of the air-sea interaction were made using direct and remote sensing methods in the coastal zone where the interaction is complex and still poorly understood. A specialized research platform, managed by the Marine Hydrophysical Institute (MHI), is placed on the shelf slope approximately 600 m offshore the Crimea coast, Ukraine. The water depth at the site is about 30 m. The experiment program included conventional turbulence measurements with the eddy-covariance method as well as remote radio-polarimetric measurements with a newly developed instrument. The study was concentrated on the air-sea interaction during episodes of weak wind in the atmosphere and upwelling events in the ocean. Analysis of the collected data confirmed significant dependence of the surface drag coefficient on the air-sea temperature difference under weak wind conditions. However, this analysis also demonstrated a new air-sea interaction regime, which is characterized by large quasi-periodic (periods about 3.5 h) turbulence oscillations developing initially in the atmosphere and later (after about 10-12 h) in the sub-surface water layer. The analysis of radiopolarimetric measurements provided the characteristics of the gravity-capillary wave field during these events.

show abstract

“…Проводились совместные с Институтом физики атмосферы РАН им. А. М. Обухова специализированные эксперименты, благодаря чему набор измеряемых метеорологических и гидрофизических характеристик существенно расширялся [45,46]. Таким образом, набор одновременно измеряемых гидрометеорологических параметров был достаточно полным, что позволяло провести адекватную параметризацию исследуемых характеристик и верифицировать теоретические модели.…”

Section: экспериментальные данныеunclassified

Model and Experimental Estimates of Vertical Mixing Intensity in the Sea Upper Homogeneous Layer

Chukharev¹,

Pavlov²

2021

MGZh

View full text Add to dashboard Cite

Purpose. The study is aimed at qualitative and quantitative analysis (based on the updated previously proposed multiscale model) of the experimental data on turbulence intensity and their comparison with theoretical and semi-empirical relationships for the purpose of describing the contributions of various turbulence sources. Methods and Results. A comparative analysis of experimental data and model calculations of turbulence characteristics near the sea surface was performed. The methods of theoretical assessing generation of turbulence in the near-surface sea layer by various physical processes are considered. The results of calculations by the well-known models of turbulent exchange were compared with the experimental data collected by the scientists of the Turbulence Department of MHI, RAS, using the specialized equipment. The analysis results made it possible to determine the possibility of applying the considered models for calculating turbulence intensity under different hydrometeorological conditions. At light winds, none of the models yielded the results which matched the measurement data. At moderate winds, the simulation results showed quite satisfactory agreement with the experiment data; and for strong winds, the multiscale model results were the best. This model was modified to assess the contributions of two other mechanisms of turbulence generation: the Stokes drift and the Langmuir circulations. Conclusions. Objective assessment of the turbulent exchange intensity requires taking into account of three main mechanisms of turbulence generation, namely flow velocity shear, wave motions and wave breaking. Depending on the hydrometeorological situation, each of these mechanisms can dominate in a certain depth range. The calculations performed using the updated model showed that the Stokes drift added 2–17 % to the total dissipation in the upper 30-meter layer, whereas the contribution of the Langmuir circulations calculated through dependence of the vertical velocity of kinetic energy transfer upon the Langmuir number, can reach 15 % for small Langmuir numbers.

show abstract

Evolution of air–sea interaction parameters during the temperature front passage: The measurements on an oceanographic platform

Cited by 6 publications

References 13 publications

Dissipation rate of turbulent kinetic energy in stably stratified sheared flows

Dissipation rate of turbulent kinetic energy in stably stratified sheared flows

Air–sea interaction under low and moderate winds in the Black Sea coastal zone

Model and Experimental Estimates of Vertical Mixing Intensity in the Sea Upper Homogeneous Layer

Contact Info

Product

Resources

About