Rainband-Occurrence Probability in Northern Hemisphere Tropical Cyclones by Synthetic Aperture Radar Imagery

Rainbands are essential to tropical cyclones (TCs), significantly affecting TC structure and intensity change. High-resolution synthetic aperture radar (SAR) imagery can capture the footprints of rainbands caused by rain-induced sea surface roughness modification. Using 464 SAR TC images, we investi...

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Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: Zheng, Gang, Jiang, Han, Wu, Liang, Li, Xiaofeng, Zhou, Lizhang, Wu, Qiaoyan, Chen, Peng, Ren, Lin
Format: Report
Language:English
Published: AMER GEOPHYSICAL UNION 2024
Subjects:
occurrence probability
rainband
synthetic aperture radar (SAR)
tropical cyclone (TC)
Geology
Geosciences
Multidisciplinary
OUTER SPIRAL RAINBANDS
DIURNAL CYCLE
INTENSITY CHANGE
SEA-SURFACE
PRECIPITATION
RAINFALL
MORPHOLOGY
RADIATION
BEHAVIOR
North Atlantic
Online Access:http://ir.qdio.ac.cn/handle/337002/185695
http://ir.qdio.ac.cn/handle/337002/185696
https://doi.org/10.1029/2023GL107555
Description
Summary:Rainbands are essential to tropical cyclones (TCs), significantly affecting TC structure and intensity change. High-resolution synthetic aperture radar (SAR) imagery can capture the footprints of rainbands caused by rain-induced sea surface roughness modification. Using 464 SAR TC images, we investigated the rainband-occurrence probability of TCs under different hemispheres, local times (LTs), intensities, and ocean basins. Results show that the rainband-occurrence probability is highest in the downshear-left quadrant for Northern Hemisphere TCs (downshear-right quadrant for Southern Hemisphere TCs). For Northern Hemisphere TCs, the rainband-occurrence probability is overall higher in the early morning (LT), and the peak region of rainband-occurrence probability appears farther from the TC center in the evening (LT). Compared with weak TCs, the rainband-occurrence probability becomes higher for strong TCs in the Northern Hemisphere. Furthermore, TCs have a higher rainband-occurrence probability in the Northwest Pacific than in the North Atlantic and Northeast Pacific. Rainbands are a salient feature of tropical cyclones (TCs) and are closely related to TC structure and intensity change. Synthetic aperture radar (SAR) can capture the sea surface imprint of rainbands beneath clouds caused by rain-induced sea surface roughness modification. Using 464 SAR TC images, we made 464 rainband-annotated data. The data were mapped to grid nodes spaced at 0.027 times the radius of max winds in a coordinate system with the origin at the TC center and the y-axis in the vertical wind shear direction. Then, the data were composited to estimate and further investigate the rainband-occurrence probability of TCs under different hemispheres, local times (LTs), intensities, and ocean basins. Results show that the rainband-occurrence probability is highest in the downshear-left quadrant for Northern Hemisphere TCs (downshear-right quadrant for Southern Hemisphere TCs). For Northern Hemisphere TCs, the rainband-occurrence probability ...

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