Work

Detection and Characterization of Polarimetric Radar Bright Band Signatures in Northern Taiwan

Year: 2025

Type: article

Abstract: A dual-polarization measurement (DPM) profile simulation was developed and applied to four years of S-band polarimetric radar observations in northern Taiwan to obtain and investigate bright band (BB) features. The algorithm exploits the BB signatures from high elevation angles radar data (≥ 6◦) in cross-correlation coefficient (ρhv), differential reflectivity (Zdr), and reflectivity (Z) to obtain BB features such as intensity (I), thickness (T), and peak height (H). A key advantage of the proposed algorithm is its ability to detect BB signatures both spatially across azimuthal directions and vertically across elevation angles over time, facilitating a composited optimalHmap. Validation against radiosonde data indicates good agreement in estimatedHvalues, with an averaged mean difference of ∼0.2 km. The algorithm effectively detects BB signatures in northern Taiwan, using DPMs as reliable indicators for ML identification, demonstrated in a cold front case study by capturing the transitionHfrom 4 km to 2 km. Climatological trends inTandIshowed elevation angle dependence, whileHremains largely independent of elevation angle. Seasonal trends indicate thatHis highest in November and lowest in February and March, which corresponds with radiosonde data, whileTandIexhibit minimal seasonal variation.

Source: IEEE Transactions on Geoscience and Remote Sensing

DOI: 10.1109/tgrs.2025.3562378

Authors: Jui Le Loh, Wei-Yu Chang, Yu-Chieng Liou, Pin-Fang Lin, Pao-Liang Chang

Institutions: National Central University, Central Weather Administration

Language: English

Topic: Precipitation Measurement and Analysis

Subfield: Atmospheric Science

Field: Earth and Planetary Sciences

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $2,645

Funders: National Science and Technology Council, Central Weather Bureau