A. A. Kubryakov

A. A. Kubryakov
Marine Hydrophysical Institute RAS · Remote Sensing

Phd.

About

139
Publications
26,285
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1,192
Citations
Additional affiliations
September 2006 - present
Marine Hydrophysical Institute, Russian Academy of Sciences
Position
  • Senior Researcher

Publications

Publications (139)
Article
Combination of altimetry-based method of eddy identification and historical hydrological measurements for 1992–2015 is used to analyze the thermohaline and dynamic structure of the Black Sea eddies and its relation with eddy intensity, eddy age and season of a year. Anticyclonic eddies (AEs) are characterized by negative salinity anomalies, which c...
Article
Four consecutive strong wind events in August 2015 caused an anomalous phytoplankton bloom in the Black Sea, which occupied almost the entire eastern basin. Maximal surface chlorophyll A concentration (Chl-A) in the bloom area exceeded 5 mg/m3 in comparison with 0.6 mg/m3 in the surrounding waters. The anomalous bloom was observed for over 3 months...
Article
Bio-Argo measurements of the backscattering coefficient (bbp) were used to investigate the time-depth evolution of coccolithophore blooms in the Black Sea. Five years of Bio-Argo data obtained in 2014-2018 revealed two distinct peaks of bbp corresponding to the winter and early summer coccolithophore blooms. The latter started in the upper mixed la...
Article
An algorithm for retrieving the fraction of the sea surface covered by whitecaps (W) from Landsat-8 satellite optical reflectance measurements in the near-infrared channel is described. The distribution of W derived from approximately 100 Landsat-8 scenes was compared with quasi-synchronous scatterometer measurements of wind speed (u10), which allo...
Article
Full-text available
Seawater properties in two intense rings in the South Atlantic are considered. One ring separated from the Brazil Current and the other from the Malvinas Current. The analysis is based on the CTD casts and SADCP measurements from the onboard velocity profiler. The optical properties, chemical parameters, methane concentration, and biological proper...
Article
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A commercial unmanned aerial vehicle (UAV) is used for coastal submesoscale current estimation. The measurements were conducted in the Black Sea coastal area with a DJI Mavic quadcopter operated in self-stabilized mode at different look geometry (200–500-m altitude, 0–30∘ incidence angle). The results of four flights during 2020–2021 are reported....
Article
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Submesoscale dynamics significantly affect the turbulence regime and is characterized by pronounced time variability, the reasons of which are still poorly known. In our study, we use high‐resolution (1 km) numerical model NEMO and satellite data in the Black Sea to demonstrate that one of the main processes impacting on the intensity of submesosca...
Article
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В работе предложен автоматической алгоритм выделения областей цветения цианобактерий (ЦБ) в Азовском море на основе анализа оптических спектров спутниковых данных MODIS. Валидация алгоритма проведена на основе сопоставления с квазисинхронными данными высокого разрешения Landsat. На основе результатов применения алгоритма были исследованы пространст...
Article
Long-term high and medium resolution satellite data are used to study spatial, seasonal and interannual variability of the cyanobacteria blooms (CB) in the North-Western Shelf (NWS) of the Black Sea. High-resolution Landsat data demonstrate that CB were regularly observed in the study area on satellite images in 1985-2020. Comparison of quasi-synch...
Article
High-resolution Bio-Argo measurements of backscattering (bbp) were used to study the vertical distribution and time variability of the sinking of small, highly reflective particles in the Black Sea in the 0–200 m layer. The evolution of particles is divided into three stages: formation, sinking, and removal. The formation of small, highly reflectiv...
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is study characterizes the spatiotemporal variability of chlorophyll-a in the Bering Sea and adjacent Pacific Ocean based on 2003–2019 MODIS data. Average long-term seasonal variations of the chlorophyll-a concentration are described, and the typical times of phytoplankton bloom in various parts of the given area are found. Interannual variability...
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The seasonal and interannual variability of water exchange in the Bering Strait and its relationship with Arctic circulation is investigated on the basis of satellite-altimetry measurements between 1993 and 2016. The intensification of northern currents in the strait is observed from April to August, when their mean speed is approximately 25 cm/s....
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The Lena River plume significantly affects the thermohaline, optical and chemical properties of the Eastern Arctic seas. We use sea surface salinity (SSS), temperature (SST), and altimetry meas-urements to study features of the Lena plume propagation during 1993-2020. Comparison of Soil Moisture Active Passive (SMAP) SSS measurements with in-situ d...
Article
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A quasi-tropical cyclone (QTC) observed over the Black Sea on 25–29 September 2005 caused an exceptionally strong anomalous autumn coccolithophore bloom that lasted for more than 1.5 months. The QTC induced intense upwelling, causing a decrease in sea surface temperature of 15 ∘C and an acceleration of the cyclonic Rim Current up to extreme values...
Article
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Eddies in the Western Arctic play an important role in transporting heat, salt, and biogeochemical tracers across the continental shelf and within the deep basins. However, comprehensive observations of the regional and temporal variability of the eddy field characteristics are difficult to obtain remotely due to the presence of sea ice, and the av...
Article
The Black Sea is characterized by powerful summer coccolithophore blooms with strong interannual variability. In this paper, we used satellite and Bio-Argo measurements to show that the emergence of extremely strong blooms in several years was caused by intense vertical entrainment of nutrients from deep isopycnal layers during winter convection. I...
Article
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Purpose. The paper is aimed at studying the relationship between the wind regime and the wind stress curl in the Black Sea and the long-term changes in the large-scale sea level pressure field in winter months. Methods and Results. The data on wind speed and sea level pressure in January – February from the NCEP/NСAR reanalysis for 1948–2018 are u...
Article
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Long-term arrays of satellite optical measurements of Landsat-5,7,8 and Sentinel-2 were used to describe the characteristics of submesoscale eddy (SE) dynamics in different parts of the Crimean coast: their geometric and kinematic characteristics, the main sites and mechanisms of formation, and impact on the redistribution of suspended matter. The...
Article
Purpose. The paper is aimed at studying the relationship between the wind regime and the wind stress curl in the Black Sea, on the one hand, and the long-term changes in the sea level pressure fields in winter months, on the other. Methods and Results. The data on wind speed and sea level pressure in January – February from the NCEP/NСAR reanalysis...
Article
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Цель. Цель данной работы-исследование сезонной изменчивости и вертикального распреде-ления энергии субмезомасштабных течений (масштабы L = 1…10 км, T = 1…10 сут) в глубо-ководной и шельфовой зонах Черного моря. Методы и результаты. Данные исследования проводятся на основе спектрального анализа результатов численных расчетов модели NEMO с высоким пр...
Article
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Purpose. The study is aimed at investigating seasonal variability and vertical distribution of the sub-mesoscale currents energy (scales L = 1 … 10 km, T = 1 … 10 days) in the deep and shelf zones of the Black Sea. Methods and Results. The study is based on the spectral analysis of the results obtained from the NEMO model numerical calculations pe...
Article
The spatial and temporal variability of winter coccolithophore blooms in the Black Sea is studied using satellite measurements for 2003-2017 and Bio-Argo buoys data. Analysis shows that such blooms can occupy the entire upper 60-meter layer with satellite-derived estimates of surface cell concentration reaching in some years 3.0·106 cells l-1. On a...
Article
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На основе высокодетальных измерений беспилотного летательного аппарата (БПЛА), спутниковых данных и измерений in situ исследуется оптическая структура субмезомасштабных вихрей в прибрежной зоне Крыма и их влияние на перенос взвешенного вещества. Показано, что субмезомасштабные циклоны вызывают интенсивные кросс-шельфовые потоки взвешенного вещества...
Article
Full-text available
High-resolution measurements by unmanned aerial vehicles (UAVs), satellite and in-situ data are used to study the optical structure of coastal submesoscale eddies and their influence on the transport of total suspended matter (TSM). It is shown that submesoscale cyclones cause intense cross-shelf TSM fluxes and subsequent accumulation of TSM in the...
Article
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В работе представлена характеристика пространственно-временной изменчивости поля концентрации хлорофилла-а в Беринговом море и прилегающей части Тихого океана, основанная на данных MODIS за 2003–2019 гг. Описана среднемноголетняя сезонная изменчивость концентрации хлорофилла-а, выявлены характерные сроки “цветения” фитопланктона в различных частях...
Article
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In the central part of the Sea of Azov for the period 2003–2018, cases of intense cyanobacteria blooming were detected in satellite data of high and medium resolution. Such events were observed from 2005 to 2010, and in 2012–2013. The longest of these blooms occurred in 2005, 2006, and 2009. The influence of temperature and wind conditions as well...
Article
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13.08.2020 г. Цель. Представлен подход, применяемый к анализу спутниковых сканерных оптических изоб-ражений высокого пространственного разрешения для идентификации и определения количе-ственных характеристик субмезомасштабных динамических процессов в верхнем слое океана. Методы и результаты. В качестве спутниковых данных используются сканерные изоб...
Article
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Рассмотрены разные типы мезомасштабной вихревой динамики с точки зрения их влияния на количество и таксономическую структуру планктона, в основном фитопланктона. Вихревые структуры всех видов, включая циклонические, антициклонические, линзовидные антициклонические и фронтальные вихри, а также дипольные структуры активно воздействуют на планктон. Ра...
Article
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The year‐to‐year seasonal variability of the vertical distribution of concentration of chlorophyll‐a (Chla) in the Black Sea, its relation to light (PAR) and mixing conditions were studied based on the six‐year (2014‐2019) measurements of Bio‐Argo floats. Variations in PAR caused by changes in incoming solar radiation and light attenuation determin...
Article
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Purpose. The approach represented in the article is applied to analysis of satellite scanner optical images of high spatial resolution for identifying and quantitative determining the characteristics of the sub-mesoscale dynamic processes in the ocean upper layer. Methods and Results. The Envisat AATSR and MERIS SAR-images are used as the satellit...
Article
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Different types of mesoscale eddy dynamics are considered in the paper from the viewpoint of their effect on the plankton (mainly phytoplankton) amount and its taxonomic structure. The eddy structures of all types, including cyclonic, anticyclonic, water-body anticyclonic and frontal ones, as well as the dipole structures, actively affect plankton....
Article
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Цель. Цель работы-исследование климатических тенденций в колебаниях среднегодовых и среднемесячных полей значительных высот волн смешанного волнения, ветрового волнения, зыби, а также скоростей ветра по всей акватории Черного моря. Методы и результаты. На основе численных расчетов модели MIKE 21 SW получены поля значительных высот волн смешанного в...
Preprint
Full-text available
Winter vertical entrainment of deep waters determines not only the amount of nutrients in the upper layers, but also the light conditions in it, through the self-shading mechanism. In this paper, we use Bio-Argo data to demonstrate significant differences in the vertical distribution of chlorophyll-a concentration (Chl) in the Black Sea between a y...
Article
Full-text available
Purpose. The paper is aimed at studying climatic trends in variability of the average annual and average monthly fields of significant wave heights of the mixed and wind waves, swell and the wind speeds in the Black Sea region. Methods and Results. Based on the MIKE 21 SW numerical model, the significant wave heights’ fields of the mixed and wind w...
Article
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Purpose. The paper is aimed at studying climatic trends in variability of the average annual and average monthly fields of significant wave heights of the mixed and wind seas, swell and the wind speeds in the Black Sea region. Methods and Results. Based on the MIKE 21 SW numerical model, the significant wave heights’ fields of the mixed and wind s...
Preprint
Full-text available
Large differences in the vertical distribution of chlorophyll-a concentration (Chl) in a year with cold and warm winter are observed in the Black Sea on the base of Bio-Argo data. Stronger winter nutrient flux from deeper isopycnal layer in cold 2017 caused an increase of Chl in the upper 40-meter layer observed throughout the whole year – from Feb...
Preprint
Full-text available
Abstract. Short-period action of the quasi-tropical cyclone in September 2005 caused strong autumn coccolithophores bloom in the Black Sea lasted for more than 1.5 months. The cyclone induced intense upwelling of deep waters with temperature on 10–13 °C lower than surrounding waters and acceleration of the Rim Current up to extreme values of 0.75 m...
Article
In autumn 2017, the influence of strong storms and mesoscale physical processes on phytoplankton has been studied in the Black Sea. Data on the taxonomic composition and biomass of phytoplankton, the concentration of chlorophyll-a (Chl), particulate organic carbon, primary production, chemical and physical properties of the environment were obtaine...
Chapter
We developed a technique of selection of along-track data of altimeters in accordance with their binding to the data of buoy measurements and data of two wave models: WAM4 and its modified version—WAM4-M. We estimated the root-mean-square deviations (RMSD) of the model data of the wind wave heights from the calibrated altimetric data in the Indian...
Article
In this paper, we analyze seasonal and interannual variability of vertical turbulent diffusion coefficient (Kt). Our calculations are based on the time series from 2013 to 2016, obtained in the north-eastern Black Sea within the depth range of 30–220 m by using an Aqualog profiler. The synchronized measurements included vertical profiles of sea tem...
Article
Full-text available
A technology for extracting along-track altimeter data collocated with space-irregular buoy measurements and data on the numerical simulation of waves is developed using AVISO altimetry data for the period 2013–2016. Data on the numerical simulation of waves are obtained on a regular spacetime grid for two wave models: WAM and its modified version,...
Article
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The article focuses on the interaction of Rossby waves in the ocean with zonal jet flows. A new approach is proposed to show that nonlinearity in the long-wave approximation exactly compensates the Doppler shift. A new dispersion relation for the Rossby waves interacting with the jets is deduced from the nonlinear theory. The conclusion is verified...
Article
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In the present study, the features of the temperature diurnal cycle of the Black Sea upper layer during different seasons were studied using temperature-profiling drifters data and the scanner SEVIRI. According to the thermodrifters data, the maximal negative temperature anomalies in the surface layer (horizon of 0.2 m) are typical for period from...
Article
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The paper presents the results of the analysis of the hydrophysical fields of the Black Sea, reconstructed in the reanalysis through the assimilation in the model of pseudo-measurements of temperature and salinity. Much attention was paid to assessing the reproduction of mesoscale eddies. To perform a retrospective analysis of hydrophysical fields,...
Article
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Цель: Исследована пространственно-временная изменчивость толщины верхнего квазиоднородного слоя (ВКС) в различных районах Черного моря и определена ее связь с динамикой вод и атмосферным воздействием за 1985-2017 гг. Методы и результаты: На основе архива гидрологических данных за 1985-2017 гг, включающего измерения судовых экспедиций, буев Argo и з...
Article
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Purpose. Spatio-temporal variability of the mixed layer depth (MLD) in different areas of the Black Sea in 1985–2017, its relationship with basin dynamics and atmospheric forcing are studied. Methods and Results. The study is based on the hydrological data archive for 1985–2017 including the measurements of the ship expeditions, the Argo buoys and...
Article
Full-text available
The Western Arctic Ocean is a host to major ocean circulation systems many of which generate eddies that can transport water masses and corresponding tracers over long distances from their formation sites. However, comprehensive observations of critical eddy characteristics are currently not available and are limited to spatially and temporally spa...
Article
Full-text available
The paper explores the spatio-temporal features of cyanobacterial blooms in the Sea of Azov based on Landsat satellite data from 1999 to 2016. The strongest blooms were observed in 1999, 2006–2009, when cyanobacteria occupied the entire central part of the Sea of Azov. In these years peak blooms occurred in August-September. In 2006, the penetratio...
Article
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In this paper, we study the mechanisms of the formation and distribution of suspended matter (SM) near the western coast of Crimea under the impact of strong winds of various directions using medium-and high-resolution satellite data. The SM concentration was noted to reach its maximal values at southern winds, reaching values of 200 mg/L. The zone...
Article
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Введение. Суточные изменения температуры поверхности моря влияют на тепло- и газообмен океана с атмосферой, стратификацию и вертикальное перемешивание в верхнем слое. Материалы и методы. Используются данные сканера SEVIRI за 2015 г. о температуре поверхностного слоя Черного моря с дискретностью 1 ч. Анализ результатов. Прогрев верхнего слоя наблю...
Article
Satellite and hydrological data were used to study the propagation of the Azov waters (Azov plume - AP) in the Black Sea, its relation to wind forcing, eddy dynamics, and water balance in the Azov and Black Seas. Strong north winds increase the inflow of the Azov waters in the basin and their further transport to the west along the Crimean coast. A...
Article
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В работе по спутниковым данным среднего и высокого разрешения исследуются механизмы образования и распространения взвешенного вещества (ВВ) у Западного берега Крыма при воздействии сильных ветров различных направлений. Было отмечено, что максимальные значения концентрация ВВ принимает при ветрах южного направления, достигая значений 200 мг/л. Зона...
Article
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Introduction. Heat and gas exchange between the ocean and the atmosphere, and stratification and vertical mixing in the sea upper layer are subjected to the diurnal variations of the sea surface temperature. Data and methods. The data obtained by the scanner SEVIRI in 2015 (time resolution is 1 hour) are used to study seasonal and spatial variabil...
Presentation
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Двенадцатая Всероссийская открытая конференция "Современные проблемы дистанционного зондирования Земли из космоса" ИКИ РАН, 10 – 14 ноября 2014 г.
Presentation
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PORSEC 2014, the Twelfth Biennial Conference with the theme "Ocean Remote Sensing for Sustainable Resources" in Denpasar – Bali, Indonesia during November 4th-7th, 2014.
Article
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The observed evidence of the implementation of three different mechanisms of the submesoscale eddies generation in the Black Sea previously studied by the field research and laboratory modeling is presented. These mechanisms are the following: (1) horizontal shear instability of the surface current; (2) flow separation behind capes and peninsulas;...
Conference Paper
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The system based on the integrated use of satellite altimetry data and wind speed from atmospheric reanalyses is proposed for calculation and prediction the trajectories of moving objects in the World Ocean. The proposed method makes it possible to sufficiently determine the movement of oil pollution, suspensions on the sea surface and to assess th...