Generation sites of internal solitary waves in the southern Taiwan Strait revealed by MODIS true-colour image observations

Bai, Xiaolin; Liu, Zhiyu; Li, Xiaofeng; Hu, Jianyu

doi:10.1080/01431161.2014.916453

Cited by 42 publications

(31 citation statements)

References 41 publications

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“…All AHI images have been calibrated and georeferenced. Three factors limit the detection or continuous tracking of ISWs in the ocean: (1) the sea surface signatures of ISWs are overlaid with clouds so it is difficult to extract the ISW wave crests; (2) the displacements of ISW wave crests is too small to differentiate in ten minutes; (3) the relative angle between the sun and the satellite is not meet the imaging mechanism of ISWs under the condition of sun glint (Bai et al, 2014a;Cox and Munk, 1954;Gagliardini, 2011;Jackson and Alpers, 2010;Shao et al, 2011;Zhang and Wang, 2010). To ensure accuracy, we abandon some degraded images mainly due to the above three factors, and resulted in 19 images observing the ISW 'b' in the north of Dongsha atoll.…”

Section: Satellite Imagesmentioning

confidence: 99%

“…The instruments obtain data in 2230 km swath with 36 spectral bands ranging in wavelength from 0.4 µm to 14.4 µm and at varying spatial resolutions (2 bands at 250 m, 5 bands at 500 m and 29 bands at 1 km). Two of spectral bands (Red and NIR) are widely used to detect and track ISWs (Bai et al, 2014b;Ho et al, 2009;Kao et al, 2007;Sun et al, 2014). In this study, MOD09GQ daily reflectance products at 250-m resolution are used for comparison with H-8 satellite data.…”

Section: Satellite Imagesmentioning

confidence: 99%

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Himawari-8 Geostationary Satellite Observation of the Internal Solitary Waves in the South China Sea

Gao¹,

Dong²,

Yang

et al. 2018

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:The new generation geostationary meteorological satellite, , was launched in 2015. Its main payload, the Advanced Himawari Imager (AHI), can observe the earth with 10-minute interval and as high as 500 m spatial resolution. This makes the H-8 satellite an ideal data source for marine and atmospheric phenomena monitoring. In this study, the propagation of internal solitary waves (ISWs) in the South China Sea is investigated using AHI imagery time series for the first time. Three ISWs cases were studied at 3:30~8:00 UTC on 30 May, 2016. In all, 28 ISWs were detected and tracked between the time series image pairs. The propagation direction and phase speeds of these ISWs are calculated and analyzed. The observation results show that the properties of ISW propagation not stable and maintains nonlinear during its lifetime. The resultant ISW speeds agree well with the theoretical values estimated from the Taylor-Goldstein equation using Argo dataset. This study has demonstrated that the new generation geostationary satellite can be a useful tool to monitor and investigate the oceanic internal waves.

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Section: Satellite Imagesmentioning

confidence: 99%

Section: Satellite Imagesmentioning

confidence: 99%

Himawari-8 Geostationary Satellite Observation of the Internal Solitary Waves in the South China Sea

Gao¹,

Dong²,

Yang

et al. 2018

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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show abstract

“…OIW's properties, such as propagation direction, amplitude and polarity and their associated oceanic interior stratification parameters can be derived from the SAR and visible imagery [3][4][5][6][7][8][9][10][11][12][13]. IWs of depression and elevation imply that they are all of mode-1 wave, as which most observed OIWs can be categorized.…”

Section: Introductionmentioning

confidence: 99%

SAR imaging of mode-2 internal waves in the South China Sea

Yang

Dong

2015

2015 IEEE International Geoscience and Remote Sensing Symposium (IGARSS)

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Mode 2 internal wave (IW) signatures are observed by the RADARSAT-1 synthetic aperture radar (SAR) in the Northeast South China Sea on April 07, 2001. In this study, we prove that the conditions of the study area are favorable for the generation and propagation of mode-2 waves to appear in SAR imagery. The generation mechanism of this mode 2 IW is mode-1 IW evolves into mode-2 convex IW packets when shoaling.

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“…2017, 9, 501 8 of 15 The IEM2 model describes the contribution of surface roughness spectrum of the ocean. On the contrast, modulation calculated by IEM3 model is a weighted sum of second-order statistics (surface roughness spectrum) and third-order statistics (bispectrum) according to Equation (10). Contribution of bispectrum was compared with the radar data in Figure 6c,d.…”

Section: Comparison Between Radar Measurements and Values Calculated mentioning

confidence: 99%

Modulation Model of High Frequency Band Radar Backscatter by the Internal Wave Based on the Third-Order Statistics

et al. 2017

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Modulation model of radar backscatters is an important topic in the remote sensing of oceanic internal wave by synthetic aperture radar (SAR). Previous studies related with the modulation models were analyzed mainly based on the hypothesis that ocean surface waves are Gaussian distributed. However, this is not always true for the complicated ocean environment. Research has showed that the measurements are usually larger than the values predicted by modulation models for the high frequency radars (X-band and above). In this paper, a new modulation model was proposed which takes the third-order statistics of the ocean surface into account. It takes the situation into consideration that the surface waves are Non-Gaussian distributed under some conditions. The model can explain the discrepancy between the measurements and the values calculated by the traditional models in theory. Furthermore, it can accurately predict the modulation for the higher frequency band. The model was verified by the experimental measurements recorded in a wind wave tank. Further discussion was made about applicability of this model that it performs better in the prediction of radar backscatter modulation compared with the traditional modulation model for the high frequency band radar or under lager wind speeds.

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Generation sites of internal solitary waves in the southern Taiwan Strait revealed by MODIS true-colour image observations

Cited by 42 publications

References 41 publications

Himawari-8 Geostationary Satellite Observation of the Internal Solitary Waves in the South China Sea

Himawari-8 Geostationary Satellite Observation of the Internal Solitary Waves in the South China Sea

SAR imaging of mode-2 internal waves in the South China Sea

Modulation Model of High Frequency Band Radar Backscatter by the Internal Wave Based on the Third-Order Statistics

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