DeHart et al. (2025) Quantifying the Relationships Between Dynamics and Rainfall Intensity Along the Mei‐Yu Front During PRECIP 2022

⚠️ Warning: This summary was generated from the abstract only, as the full text was not available.

Identification

• Journal: Geophysical Research Letters
• Year: 2025
• Date: 2025-12-19
• Authors: Jennifer C. DeHart, Michael M. Bell
• DOI: 10.1029/2025gl117992

Research Groups

Data from the joint Prediction of Rainfall Extremes Campaign in the Pacific 2022 and Taiwan-Area Heavy rain Observation and Prediction Experiment field campaigns.

Short Summary

This study uses multi-Doppler analyses to investigate the dynamic characteristics associated with varying rainfall intensities during two Mei-Yu frontal periods over the ocean, finding that higher rain rates correlate with increased vertical vorticity, vertical motion, and divergence, with heavy convective rain (10-50 mm/h) contributing over 45% of total volumetric rainfall, preferentially occurring in moderately strong rotating convection.

Objective

• To examine the relationships between atmospheric dynamics (vertical vorticity, vertical motion, and divergence) and rainfall intensity in oceanic Mei-Yu frontal periods.

Study Configuration

• Spatial Scale: Oceanic regions affected by Mei-Yu frontal systems, specifically within the domain of the field campaigns.
• Temporal Scale: Two Mei-Yu frontal periods, with statistics derived from 8 days of oceanic rainfall observations.

Methodology and Data

• Models used: Not applicable; the study uses observational analyses.
• Data sources: Multi-Doppler radar analyses from the Prediction of Rainfall Extremes Campaign in the Pacific 2022 and Taiwan-Area Heavy rain Observation and Prediction Experiment field campaigns.

Main Results

• A mean increase and a positive shift in the distributions of vertical vorticity, vertical motion, and divergence are observed with increasing rain rate intensity.
• In regions of higher rain rates, mean ascent maximizes in the upper troposphere, low-level convergence intensifies over a deeper layer, and upper-level divergence strengthens.
• Stratiform rainfall (below 5 mm/h) is frequent but contributes minimally to total rainfall volume.
• Heavy convective rain rates between 10 mm/h and 50 mm/h, despite representing only 6% of observed raining grid points over the ocean, contribute over 45% of the total volumetric rainfall.
• The highest rain accumulations in oceanic Mei-Yu precipitation preferentially occur in moderately strong rotating convection.

Contributions

• Provides quantitative statistical relationships between key dynamic fields (vertical vorticity, vertical motion, divergence) and rainfall intensity in oceanic Mei-Yu frontal systems using multi-Doppler observations.
• Highlights the significant contribution of heavy convective rain, particularly from moderately strong rotating convection, to total rainfall volume in this specific meteorological context.

Funding

• Not specified in the provided abstract.

Citation

@article{DeHart2025Quantifying,
  author = {DeHart, Jennifer C. and Bell, Michael M.},
  title = {Quantifying the Relationships Between Dynamics and Rainfall Intensity Along the Mei‐Yu Front During PRECIP 2022},
  journal = {Geophysical Research Letters},
  year = {2025},
  doi = {10.1029/2025gl117992},
  url = {https://doi.org/10.1029/2025gl117992}
}