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.

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利用合成孔径雷达图像计算北半球热带气旋雨带发生概率

雨带对于热带气旋（TC）至关重要，显着影响热带气旋的结构和强度变化。高分辨率合成孔径雷达（SAR）图像可以捕获由降雨引起的海面粗糙度改变引起的雨带足迹。利用464幅SAR热带气旋影像，研究了不同半球、当地时间、强度和洋盆条件下热带气旋雨带出现的概率。结果表明，北半球热带气旋在下切变左象限（南半球热带气旋在下切变右象限）出现雨带的概率最高。对于北半球热带气旋来说，清晨（LT）雨带出现概率总体较高，而傍晚（LT）雨带出现概率峰值区域则出现在距离热带气旋中心较远的地方。与弱TC相比，北半球强TC雨带出现概率更高。此外，西北太平洋热带气旋出现雨带的概率高于北大西洋和东北太平洋。