Method to correct both foam and rain effects on dual frequency altimeter Jason1 wind measurements in typhoon Shanshan

Yang, Le; Zou, Juhong; Lin, Mingsen; Pan, Delu

doi:10.1117/12.799623

Cited by 6 publications

(8 citation statements)

References 27 publications

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“…At present, the calibration of the Jason‐2 radiometer is still yet to be completed. Finally, Yang et al [2008] noted that the presence of surface foam under large storms make the estimation of the attenuation due to rain more problematic, as both K u and C band measures are affected. However, developing a consistency in rain detection and attenuation estimation for Jason‐1 and Jason‐2 is a major step toward the development of a consistent quantitative rain climatology spanning the two altimetric missions.…”

Section: Discussionmentioning

confidence: 99%

Improving the altimetric rain record from Jason‐1 and Jason‐2

Quartly¹

2010

J. Geophys. Res.

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[1] Dual-frequency rain flagging has long been a standard part of altimetric data analysis, both for quality control of the data and for the study of rain itself, because altimeters can provide a finer spatial sampling of rain than passive microwave instruments can. However, there have been many varied implementations, using different records of the surface backscatter and different thresholds. This paper compares four different measures available for the recently launched Jason-2. The evaluation compares these measures against clearly desired properties, finding that in most cases the adjusted backscatter and that from the ice retracker perform much better than the one recommended in the users' handbook. The adjusted backscatter measure also provides a much better link to observations from Jason-1, opening up a much longer period for consistent rain investigations and enabling greatly improved analysis of the short-scale variability of precipitation. Initial analysis shows that although the spatial and temporal gradients of backscatter increase at very low winds, the spatial gradients in rain attenuation are concentrated where rainfall is greatest, while the temporal changes have a simple broad latitudinal pattern.

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Section: Discussionmentioning

confidence: 99%

Improving the altimetric rain record from Jason‐1 and Jason‐2

Quartly¹

2010

J. Geophys. Res.

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“…The presented algorithms in the paper are valid. 4) Although the effect of foams was considered on measurement results of wind speed [11][12][13], the plotted curve based on a three-layer model diverged distinctly from YG, BR and ZT especially in high wind speeds ( Figure 5). Obviously, the four-layer model in this paper is closer to the practical sea conditions than the threelayer one.…”

Section: The Analysis Of the Improved Wind Speed Algorithmmentioning

confidence: 98%

“…In 1986, Gairola [12] also investigated the reflectivity of a sea surface covered by whitecaps and foams at 13.9 GHz based on a three-layer medium model, and applied the computed result to the sea surface wind speed retrieval. In 2008, Yang [13] also computed a three-layer model for correcting backscattering coefficient. When these research results were applied in retrieving sea surface wind speed, the accuracy would be improved to some extent.…”

Section: Introductionmentioning

confidence: 99%

An Improved Method of Retrieving Sea Surface Wind Speed Based on a Four-Layer Medium Model at High Sea States

Tian¹,

Liu²,

Pan³

et al. 2014

IJG

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Considering about the effect of whitecaps and foams on pulse-limited Radar Altimeters, an improved algorithm of retrieving sea surface wind speed is proposed in this paper. Firstly, a four-layer dielectric model is established in order to simulate an air-sea interface. Secondly, the microwave reflectivity of a sea surface covered by spray droplets and foams at 13.5 GHz is computed based on the established model. These computed results show that the effect of spray droplets and foams in high sea state conditions shall not be negligible on retrieving sea surface wind speed. Finally, compared with the analytical algorithms proposed by Zhao and some calculated results based on a three-layer dielectric model, an improved algorithm of retrieving sea surface wind speed is presented. At a high wind speed, the improved algorithm is in a better accord with some empirical algorithms such as Brown, Young ones and et al., and also in a good agreement with ZT and other algorithms at low wind speed. This new improved algorithm will be suitable not only for low wind speed retrieval, but also for high wind speed retrieval. Better accuracy and effectiveness of wind speed retrieval can also be obtained.

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“…In 1986, Gairola and Pandey [12] also investigated the reflectivity of a sea surface covered by foams at 13.9 GHz based on a three-layer medium model, and applied the computed results to the sea surface wind speed retrieval. In 2008, Yang et al [13] also computed the reflectivity of a three-layer model in order to correct backscattering coefficient σ 0 . When all these research results are applied to the oceanic surface wind speed retrieval, the accuracy of estimating wind speed can be improved to some extent.…”

Section: Introductionmentioning

confidence: 99%

Improved algorithm of retrieving oceanic surface wind speed based on a stratified media model at high sea states

Tian

Liu

Pan

et al. 2014

IET Microwaves, Antennas & Propagation

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Consider the effect of spray droplets and foams on the radar altimeter, an improved algorithm of retrieving oceanic surface wind speed is proposed in this study. Firstly, a four‐layer medium model is established in order to simulate accurately the air–sea interface. Secondly, the microwave reflectivity of the established model is computed at 13.5 GHz. The computed results show that the effect of spray droplets and foams plays an important role in the reflectivity of the air–sea surface and causes it to decline from 0.6 to 0.23. Thirdly, the computed results are applied to retrieve the sea surface wind speed and an improved algorithm of retrieving wind speed is proposed. At low wind speeds, the improved algorithm is in good agreements with those reported results, and at high wind speeds is also in good agreements with some empirical algorithms presented by Brown, Young and so on. Finally, the improved algorithm can improve the sea surface wind speed retrieval more effectively and also is closer to the actual situation of the sea surface than those algorithms based on the three‐layer medium model.

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Method to correct both foam and rain effects on dual frequency altimeter Jason1 wind measurements in typhoon Shanshan

Cited by 6 publications

References 27 publications

Improving the altimetric rain record from Jason‐1 and Jason‐2

Improving the altimetric rain record from Jason‐1 and Jason‐2

An Improved Method of Retrieving Sea Surface Wind Speed Based on a Four-Layer Medium Model at High Sea States

Improved algorithm of retrieving oceanic surface wind speed based on a stratified media model at high sea states

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