Sea state bias in altimetry measurements within the theory of similarity for wind-driven seas

Badulin, Sergei I.; Grigorieva, V. G.; Shabanov, Pavel; Sharmar, Vitali; Karpov, I. O.

doi:10.1016/j.asr.2019.11.040

Cited by 18 publications

(14 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…After the incidence angle exceeds 40 degrees, the sea states have almost no effect on radar backscattering. As mentioned in literatures, e.g., [50], [53], the sea state is an important factor to be considered when we use the information obtained from altimeter to retrieve the geophysical parameters of sea surface. In summary, the sea state only affects the power levels of large-scale wave components, resulting in some influence on the values of NBCSs simulated at small and medium incidence angles where the large-scale wave components have varying modulation impacts on radar backscattering through their tilting effects.…”

Section: Uncertain Considerations Of the Simulation Resultsmentioning

confidence: 99%

Quantitative Evaluation of the Effects of Large-Scale Sea Wave Components on Microwave Backscattering From Ocean Surface

Xie

Guo

2022

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

View full text Add to dashboard Cite

This paper quantitatively examined the effect of these long-wave components with wavelength larger than the Bragg component on radar backscattering using the series-expanded first-order small slope approximation (SSA-1) and the Hwang sea wave spectrum model. Firstly, some roughness with various scales are constructed using different long-wave sea spectrum components and subsequently are cast into SSA-1 to obtain the corresponding normalized backscattering cross-section (NBCS) at different radar frequency, incidence angles, and wind speeds, respectively. Then, the effect of large-scale wave components on radar backscattering is revealed by analyzing the NBCSs with different roughness. Finally, the existing wavelength filtering theory explained the effect of large-scale waves on radar backscattering. It was also verified by another scattering model, i.e., the advanced integral equation model (AIEM) and radar measurements. Besides, we also investigate the effects of sea states and swell waves on the numerical simulation results. The effect of long-scale waves on NBCS clarifies the source of backscattering from the multiscale sea surface, which is helpful for both analytical and numerical scattering models to explore the sea surface scattering properties and better interpret the radar sensing of sea surface. Also, the examination of the effect of sea states and swell waves on radar backscatter is instructive for reducing the inversion errors of sea surface wind speed from radar measurements by means of configuring the appropriate radar parameters (e.g., high frequencies and large incidence angles).

show abstract

Section: Uncertain Considerations Of the Simulation Resultsmentioning

confidence: 99%

Quantitative Evaluation of the Effects of Large-Scale Sea Wave Components on Microwave Backscattering From Ocean Surface

Xie

Guo

2022

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

View full text Add to dashboard Cite

show abstract

“…velocity of the gas is in the range of 2-3 m/s, and the average axial velocity is less than 0.2 m/s. (4) The film bearing capacity and resistance torque are directly proportional to the gas viscosity, but not related to the gas density. (5) The motor with a closed pressure outlet can obtain a greater bearing capacity, while its rotational resistance torque is almost unchanged.…”

Section: Credit Authorship Contribution Statementmentioning

confidence: 99%

“…Davey et al 3 examined the possibility of breaking the requirement for geometric similarity by introducing the law of finite similitude for anisotropic scaling, which applies to continuum mechanics on anisotropically-scaled spaces. Badulin et al 4 applied the similarity theory for wind-driven seas to the physical analysis of the problem of sea state bias in altimetry measurements. Klein et al 5 built a new regularized, parameter free scale similarity type model for Large Eddy, which exhibits good performance for a variety of mesh resolutions and for all configurations.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic characteristics analysis of a multiscale hemispherical dynamic pressure motor based on similarity theory

Niu

Wang

Sun

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

Hemispherical dynamic pressure motors (HDPMs) are used in high precision gyroscope instruments, and the aerodynamic characteristics of gas in bearing clearance have an important influence on gyroscope accuracy. Due to the multiscale structure of the gas domain, there are few valuable studies on the aerodynamic characteristics of the HDPM. In this paper, a calculation model of HDPM was established based on similarity theory and computational fluid dynamics (CFD) method, which was solved under different conditions. The results indicate that the load force and resistance torque of the gas film are inversely proportional to the clearance size between the stator and rotor, which are also significantly related to the gas viscosity and the type of pressure outlet. This work can provide a method for the investigation of dynamic pressure characteristics for the multiscale fluid, and can also provide a reference for the optimal design and fault diagnosis of dynamic pressure motors.

show abstract

“…tidal corrections. Other corrections, like Sea State Bias (SSB), are estimated parametrically [13][14][15] as functions of the directly measured values (e.g. H s and σ 0 ).…”

Section: The Jason's Interleaved Orbits Inter-crossoversmentioning

confidence: 99%

Self- and Inter-Crossover Points of Jasons’ Missions as New Essential Add-on of Satellite Altimetry in the Sub-Arctic Seas and the Southern Ocean

Badulin¹,

Kostianoy²,

Shabanov³

et al. 2021

Preprint

View full text Add to dashboard Cite

Satellite altimetry is successfully developing during the past three decades for the sea level, ocean dynamics, coastal oceanography, planetary waves, ocean tides, wind and wave, ice cover, Earth’s gravity field, and climatology research. We propose a new essential add-on of satellite altimetry related to the peculiarities of the orbits of the Topex/Poseidon and Jasons’ satellite missions which were not mentioned before in the scientific publications. Derived subsets of “self-crossover” and “inter-crossover” points in sub-polar latitudes are discussed in detail in the context of water exchange, and wind-wave dynamics, and potential challenges to be solved. The relatively short time lags between measurements at these crossovers provide additional information on anomalies of magnitudes and directions of ocean currents, and characteristics of wind-driven waves. Resulting data snapshots with constant space and time intervals can be regarded as time series of virtual buoys, an analog of continuous buoy measurements of the sea level, wind speed, and wave height. Areas of the World Ocean where these specific crossovers occur are described in the context of water exchange, wind wave studies, and potential challenges to be solved. The value of these special crossovers for studies and monitoring of the sub-polar seas is illustrated by a case study.

show abstract

Sea state bias in altimetry measurements within the theory of similarity for wind-driven seas

Cited by 18 publications

References 35 publications

Quantitative Evaluation of the Effects of Large-Scale Sea Wave Components on Microwave Backscattering From Ocean Surface

Quantitative Evaluation of the Effects of Large-Scale Sea Wave Components on Microwave Backscattering From Ocean Surface

Aerodynamic characteristics analysis of a multiscale hemispherical dynamic pressure motor based on similarity theory

Self- and Inter-Crossover Points of Jasons’ Missions as New Essential Add-on of Satellite Altimetry in the Sub-Arctic Seas and the Southern Ocean

Contact Info

Product

Resources

About