A5067336487- Oceanographic and Atmospheric Processes
- Climate variability and models
- Ocean Waves and Remote Sensing
- Meteorological Phenomena and Simulations
- Arctic and Antarctic ice dynamics
- Marine and coastal ecosystems
- Geology and Paleoclimatology Research
- Geophysics and Gravity Measurements
- Tropical and Extratropical Cyclones Research
- Marine and environmental studies
- Methane Hydrates and Related Phenomena
- Aquatic and Environmental Studies
- Marine and fisheries research
- Geological and Geophysical Studies
- Soil Moisture and Remote Sensing
- Atmospheric and Environmental Gas Dynamics
- Coastal and Marine Management
- Hydrocarbon exploration and reservoir analysis
- Underwater Acoustics Research
- Complex Systems and Time Series Analysis
- Nuclear Issues and Defense
- Geomagnetism and Paleomagnetism Studies
- Seismic Imaging and Inversion Techniques
- Seismic Waves and Analysis
- Scientific Research and Discoveries
Bauman Moscow State Technical University
2025
Earth and Space Research
2022-2023
Pacific International Center for High Technology Research
2007-2022
University of Hawaii System
2013-2022
University of Hawaiʻi at Mānoa
2008-2021
Marine Hydrophysical Institute
1999-2009
National Academy of Sciences of Ukraine
2004-2009
Naval Postgraduate School
2007
United States Department of the Navy
2005
United States Navy
2005
Abstract Presented here are three mean dynamic topography maps derived with different methodologies. The first method combines sea level observed by the high-accuracy satellite radar altimetry geoid model of Gravity Recovery and Climate Experiment (GRACE), which has recently measured earth’s gravity unprecedented spatial resolution accuracy. second one synthesizes near-surface velocities from a network ocean drifters, hydrographic profiles, winds sorted according to horizontal scales. In...
Advances in L-band microwave satellite radiometry the past decade, pioneered by ESA's SMOS and NASA's Aquarius SMAP missions, have demonstrated an unprecedented capability to observe global sea surface salinity (SSS) from space. Measurements these missions are only means probe very-near (top cm), providing a unique monitoring for interfacial exchanges of water between atmosphere upper-ocean, delivering wealth information on various processes ocean, linkages with cycle climate, constraints...
XBT and float data of the World Ocean Database 2005 are used to validate new stationary jet‐like features (striations) recently found in high‐resolution mean dynamic ocean topography (MDOT). Two study areas were selected eastern parts North South Pacific subtropical gyres free any strong currents. Appropriate horizontal high‐pass filtering applied ensemble‐mean temperature at 100 m depth revealed striation signal coherent with MDOT. The also distinct 12°C isotherm lying close thermocline....
Abstract A new high‐resolution sea surface salinity (SSS) analysis has been produced using Aquarius satellite observations from September 2011 to June 2015. The motivation for the product is twofold: produce Level‐4 SSS that consistent with existing in situ such as Argo profile data, and reduce large‐scale biases have existed all versions of standard Level‐3 products. a weekly on nearly global 0.5° grid. method optimum interpolation (OI) takes into account analyzed errors observations,...
Aquarius was the first NASA satellite to observe sea surface salinity (SSS) over global ocean. The mission successfully collected data from 25 August 2011 7 June 2015. project released its final version (Version-5) of SSS product in December 2017. purpose this paper is summarize validation results Validation Data System (AVDS) and other statistical methods, provide a general view quality users. demonstrate that has met target measurement accuracy requirement 0.2 psu on monthly averages 150...
Abstract The mean vertical structure and transport properties of mesoscale eddies are investigated in the North Atlantic subtropical gyre by combining historical records Argo temperature/salinity profiles satellite sea level anomaly data framework eddy tracking technique. study area is characterized a low kinetic energy surface salinity maximum. Although have relatively weak signal at (amplitudes around 3–7 cm), composites reveal clear deep that penetrates down to least 1200 m depth....
A persistent signature of coherent mesoscale eddies in sea surface salinity (SSS) is revealed by analyzing the relationship between satellite SSS and height (SSH) variability an eddy-following reference frame. Our analysis focuses on mid-ocean two representative regions, southern Indian Ocean North Atlantic subtropical gyre. The resulting composite averages reveal a clear with typical anomalies 0.03–0.05 psu. spatial structure eddy-induced perturbations can be characterized as superposition...
Abstract A method is presented for mapping sea surface salinity (SSS) from Aquarius level-2 along-track data in order to improve the utility of SSS fields at short length [O(150 km)] and time [O(1 week)] scales. The based on optimal interpolation (OI) derives an estimate a grid point as weighted sum nearby satellite observations. weights are optimized minimize estimation error variance. As initial demonstration, applied North Atlantic. key element that it takes into account so-called...
Abstract Using newly available satellite observations of sea surface salinity (SSS), we provide, for the first time, a detailed and synoptic view spatiotemporal variability SSS in South China Sea (SCS). The results depict SCS as very dynamic region exhibiting over broad range time scales, from intraseasonal to interannual, with seasonal cycle dominating (∼47% total variance). distribution has considerable latitudinal variations: strongest variance across southern (∼5–12°N), weaker northern...
Abstract Argo profiling floats and L‐band passive microwave remote sensing have significantly improved the global sampling of sea surface salinity (SSS) in past 15 years, allowing study range SSS seasonal variability using concurrent satellite situ platforms. Here, harmonic analysis was applied to four 0.25° products two 1° between 2016 2018 determine patterns. The World Ocean Atlas (WOA) version referenced help assess patterns from a long‐term perspective based on 3‐year period. results...
Abstract This study provides a quantitative assessment of steric changes associated with sea level rise in the upper (0–500 m) South Indian Ocean (SIO) during 1993–2017, using latest ocean state estimate Estimating Circulation and Climate (ECCO) combined in‐situ observations from Argo. Both ECCO show low‐latitude (0°–30°S) SIO that is faster than its Pacific Atlantic counterparts by factor at least two. Much this fast due to warming freshening ocean, no significant contribution deeper layers...
Argo float data (subsurface tracks and temperature profiles collected from March 2004 through May 2005) are used to detect signatures of long Rossby waves in the velocity currents at 1000‐m depth temperature, between ocean surface 950 m, zonal band 4°N–24°N tropical North Atlantic. Different types (with characteristic scales 1000 2500 km) identified western [west Mid‐Atlantic Ridge (MAR)] eastern [east MAR] subbasins. Along‐shore wind fluctuations an equatorially forced coastal Kelvin wave...
Sea surface salinity (SSS) observations from NASA's satellite missions, Aquarius/SAC-D and Soil Moisture Active Passive (SMAP), are used to describe spatial patterns of the seasonal cycle, as well intraseasonal interannual variability, in eastern tropical Pacific, location second Salinity Processes Upperocean Regional Study (SPURS-2) field experiment.The results indicate that distribution SSS variance is highly inhomogeneous both space time.The signal largest core Eastern Pacific Fresh Pool...
The annual sea ice minimum extent in the Arctic Ocean has decreased almost two-fold since advent of satellite observations 1970s, leaving more open water before fall freeze-up.  Here, we leverage a combined dataset from 2022 NASA Salinity and Stratification at Sea Ice Edge (SASSIE) field program to elucidate central hypothesis that drove SASSIE: Does surface salinity stratification due melt, precipitation, riverine inputs lead changes rates or autumnal advance? SASSIE study region...
A new approach is developed to reconstruct a three-dimensional incompressible flow from noisy data in an open domain using two-scalar (toroidal and poloidal) spectral representation. The results are presented two parts: theory (first part) application (second part). In Part I, this includes (a) boundary extension method determine normal tangential velocities at boundary, (b) establishment of homogeneous conditions for the potentials with spatially varying coefficient κ, (c) expansion (d)...
The capability of the reconstruction scheme developed in is demonstrated here through three practical applications. First, nonlinear regression model used to reproduce upper-layer three-dimensional circulation eastern Black Sea from data distorted by white and red noises. Second, quasigeostrophic approximation reconstruct shallow water pattern an open domain with various sampling strategies. Third, large-scale Southern Ocean reproduced First Global Atmospheric Research Program (GARP)...
Abstract Good knowledge of mesoscale eddy properties and their spatial temporal distribution in the world ocean is important for an accurate estimate role heat, salt, and/or momentum transports. Composites satellite sea level anomaly, used to evaluate internal structure, commonly produce, at larger radii, a series rings alternating sign. We suggest that these secondary are not part dynamical structure “central” but rectified signature surrounding eddies. show statistical polarities random...
RAFOS float observations collected between 1992 and 2002 were analyzed to identify the seasonal variability of circulation in four geographical boxes which extended along central northern California coast successively located farther offshore. The mean pressure floats was 375 dbar. Poleward flow associated with Undercurrent dominated two closest shore, extending from 400‐m isobath a distance 190 km For box monthly alongshore velocity maximum (minimum), 5.4 cm/s (1.7 cm/s), May–June...
Observations of sea surface salinity (SSS) from NASA’s Soil Moisture Active-Passive (SMAP) and ESA’s Ocean Salinity (SMOS) satellite missions are used to characterize quantify the contribution mesoscale eddies ocean transport salt. Given large errors in retrievals and, consequently, SSS maps, we evaluate two products also use different methods assess eddy Comparing missions, find that estimates salt agree very well, particularly tropics subtropics. The is divergent subtropical gyres (eddies...
Abstract Recent observations suggest that the mean mesoscale oceanic zonal velocity field is dominated by alternating jet‐like features often referred to as striations. Here generating dynamics of Northeast Pacific striations are explored with a set 120 year eddy‐permitting model simulations. Simulations conducted decreasing complexity toward idealized configurations retaining essential and forcing necessary for striation development. For each simulation, we diagnose spin‐up ocean...
Abstract Fall–winter recurrence of current reversal from westward to eastward is identified on the Texas–Louisiana continental shelf using current-meter [Texas–Louisiana Shelf Physical Oceanography Program (LATEX-A)] and near-surface drifting buoy [Surface Current Lagrangian Drift (SCULP-1)] observations in 1993 1994. Reversal events roughly satisfy Poisson distribution with one nearly every 12 days. Synoptic winds seem responsible for events. Other processes such as offshore eddies shed...
The circulation in the western portion of Black Sea 1987 is assessed from surface drifter trajectories, climatological data, and numerical modeling. These diverse data sources are combined by paradigm reported companion article. primary emphasis on low‐frequency wave number characteristics. analysis suggests that there may be a seasonal change direction large‐scale circulation.
Every forecast should include an estimate of its likely accuracy, as a measure predictability. A new measure, the first passage time (FPT), which is defined period when model error exceeds predetermined criterion (i.e., tolerance level), proposed here to theoretical framework developed determine mean and variance FPT. The low-order Lorenz atmospheric taken example show robustness using FPT quantitative for prediction skill. Both linear nonlinear perspectives errors are analytically...