The study of single station inverting the sea surface current by HF ground wave radar based on adjoint assimilation technology

Han, Shuai; Ye, Hua; Xue, Wenhu; Wang, Xingchi

doi:10.1007/s11802-017-3189-8

Cited by 7 publications

(4 citation statements)

References 13 publications

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“…Although this pair of radars were validated by previous scholars [5], quality control (QC) of the data is necessary due to observational errors. The main procedure of QC is to eliminate the 'abrupt' values in space and time by standard deviation threshold method [6]. A threshold on data coverage rate is also used to screen out the grid points with less data.…”

Section: Hf Radar Observationsmentioning

confidence: 99%

Memory of HF radar surface-current assimilation on different forecasting variables of ocean circulation models

Wu,

Ning,

Jiao

2024

J. Phys.: Conf. Ser.

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In this study, using nudging method, the current data from a pair of HF radar along Jiangsu coast was assimilated to unstructured grid models based on FVCOM. Several experiments were conducted to examine the effect of radar data on surface velocity, elevation and sea surface salinity forecast. The results show that the gain of assimilation on surface velocity and elevation forecasts disappeared fast within a few hours, while salinity forecasts can be influenced for more than 10 days. This fast diminishing of the gain of data assimilation on current and elevation can be attributed to the fast wave propagation from elsewhere to the radar coverage area.

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Section: Hf Radar Observationsmentioning

confidence: 99%

Memory of HF radar surface-current assimilation on different forecasting variables of ocean circulation models

Wu,

Ning,

Jiao

2024

J. Phys.: Conf. Ser.

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“…When the high-frequency electromagnetic waves propagate along the coastal surface, the electromagnetic waves interact with the sea water, and the target object on the sea surface and are scattered. The back-scattered echo is analyzed and processed by the special receiver to obtain the state information on the sea surface [46,47].…”

Section: High-frequency Ground Wave Radarmentioning

confidence: 99%

A Comprehensive Study of a Winter Haze Episode over the Area around Bohai Bay in Northeast China: Insights from Meteorological Elements Observations of Boundary Layer

et al. 2022

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Based on wind profile radar observations, along with high-frequency wave radar data, meteorological data, and air quality monitoring data, we studied a haze episode in Panjin—a coastal city around Bohai Bay in Northeast China—that occurred from 8 to 13 February 2020. The results show that this persistent pollution event was dominated by PM10 and PM2.5 and their mass concentrations were both ~120 μg/m3 in the mature stage. In the early stage, the southerly sea breeze of ~4.5 m/s brought a large amount of moist air from the sea, which provided sufficient water vapor for the condensation and nucleation of pollutants, and thus accelerated the formation of haze. In the whole haze process, a weak updraft first appeared in the boundary layer, according to the vertical profile, contributing to the collision and growth of particulate matter. Vertical turbulence was barely observed in the mature stage, with the haze layer reaching 900 m in its peak, suggesting stable stratification conditions of the atmospheric boundary layer. The explosive growth of pollutant concentrations was about 10 h later than the formation of the stable stratification condition of the boundary layer. The potential source areas of air pollutants were identified by the WRF-FLEXPART model, which showed the significant contribution of local emissions and the transport effect of sea breeze. This study provides insights into the formation mechanism of haze pollution in this area, but the data observed in this campaign are also valuable for numerical modeling.

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“…It is not limited by weather conditions and can acquire long-term observations. HFSWRS utilizes vertically polarized high-frequency electromagnetic waves for detection [15][16][17]. HFSWRS operates on the principle of Bragg scattering, where electromagnetic waves from the transmitting antenna scatter back towards the antenna when the wavelength of the waves is half the radar wavelength upon reaching the sea surface [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Spring Sea Surface Currents near the Pearl River Estuary Observed by a Three-Station High-Frequency Surface Wave Radar System

Li,

Zhang,

Wang

et al. 2024

Remote Sensing

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The processes of ocean dynamics are complex near the Pearl River Estuary and are not clear due to a lack of abundant observations. The spatial characteristics of the spring sea surface currents in the adjacent waters of the Pearl River Estuary were analyzed using the current data observed by a three-station high-frequency surface wave radar system (HFSWRS). Compared with the two-station HFSWRS, the deviation of current velocity and direction observed by the three-station HFSWRS from the underway measurements decreased by 42.86% and 38.30%, respectively. The analyzed results show that the M2 tidal current is the dominant current among all the tidal constituents, followed by K1, with angles of inclination ranging from 130° to 150°. The tidal flow is dominated by northwest–southeast back-and-forth flow. In the southern part of the observed area, which is far from the coastline, the tidal current ellipses exhibit a circular pattern. The prevalent tidal current type in this region is irregularly semi-diurnal, and the shallow water constituents also have a significant effect. The tidal energy in the adjacent waters of the Pearl River Estuary is affected by potential energy flux and kinetic energy flux. As the water depth and currents velocity increase in the southeast direction, the tidal energy flux increases. In the nearshore zone, the direction of tidal energy flux varies along the coastline. The changes in the residual current within the observed area are correlated with the sea surface wind field. Based on the high-precision sea surface current observed by the three-station HFSWRS, the characteristics of the ocean dynamic processes near the Pearl River Estuary are analyzed comprehensively, which provides important reference and confidence for the application of the developing new radar observing network with about 10 radar stations near the Pearl River Estuary.

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The study of single station inverting the sea surface current by HF ground wave radar based on adjoint assimilation technology

Cited by 7 publications

References 13 publications

Memory of HF radar surface-current assimilation on different forecasting variables of ocean circulation models

Memory of HF radar surface-current assimilation on different forecasting variables of ocean circulation models

A Comprehensive Study of a Winter Haze Episode over the Area around Bohai Bay in Northeast China: Insights from Meteorological Elements Observations of Boundary Layer

Characteristics of Spring Sea Surface Currents near the Pearl River Estuary Observed by a Three-Station High-Frequency Surface Wave Radar System

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