Application of a random forest algorithm that considers barometric pressure in GNSS-R sea surface wind speed retrieval

This paper aims to rely on CYGNSS data to propose a random forest-based wind speed retrieval method that considers barometric pressure as a pivotal factor. Taking the Hawaiian Islands and the peripheral waters as the subject, the research conducts a systematic analysis of the spatial-temporal variat...

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Vydáno v:Journal of physics. Conference series Ročník 2935; číslo 1; s. 12014 - 12025
Hlavní autoři: Ma, Yi, Wang, Yifan, Wang, Guofang, Geng, Hao, Chen, Yuan
Médium: Journal Article
Jazyk:angličtina
Vydáno: Bristol IOP Publishing 01.01.2025
Témata:
Algorithms
Atmospheric pressure
Energy sources
Error analysis
Multistatic radar
Ocean currents
Radar cross sections
Radar scattering
Regional development
Retrieval
Scattering cross sections
Surface wind
Wind power
Wind speed
Winter
ISSN:1742-6588, 1742-6596
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Shrnutí:This paper aims to rely on CYGNSS data to propose a random forest-based wind speed retrieval method that considers barometric pressure as a pivotal factor. Taking the Hawaiian Islands and the peripheral waters as the subject, the research conducts a systematic analysis of the spatial-temporal variation characteristics of wind speeds. In this case, an innovative random forest (RF) model that considers barometric pressure is built and trained, with the longitude, latitude, time, normalized bistatic radar scattering cross section (NBRCS), leading-edge slope (LES), and barometric pressure data as the input features, and the measured buoy wind speeds as the target variable. The results show that the introduction of barometric pressure can significantly improve the accuracy of wind speed retrieval, raising the correlation to above 0.8 and reducing the root mean square error (RMS) by more than 40%. The RF (pressure) method performs best when the pressure system changes dynamically, such as in winter. In the Hawaiian Islands, moreover, the wind speeds exhibit notable spatial variations across seasons. The wind speeds are generally stable and moderate in spring and autumn. In winter, the wind speeds in the northern and northwestern regions can reach the highest level. In summer, the wind speeds in the southeastern region come to a significant decrease. These findings reveal the complex influences of barometric gradients like the subtropical high and the Aleutian Low, as well as topography and ocean currents, on wind speeds, providing a scientific basis for understanding regional climatic dynamics and wind energy resource development.
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ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/2935/1/012014