Zhang et al. (2025) Diurnal Propagation of Precipitation in Landfalling Tropical Cyclones

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

Identification

• Journal: Journal of Geophysical Research Atmospheres
• Year: 2025
• Date: 2025-12-25
• Authors: X. L. Zhang, Shan Guo, XuWei BAO, Weixin Xu
• DOI: 10.1029/2025jd044440

Research Groups

Not available in the provided abstract.

Short Summary

This study investigates the diurnal propagation of precipitation (DPP) in landfalling tropical cyclones (TCs) globally, revealing that these events account for approximately 30% of landfalling TC days and lead to wider and more extreme rainfall distributions. It identifies distinct initiation times and underlying mechanisms for overland DPP compared to open-ocean events.

Objective

• To identify and characterize overland diurnal propagation of precipitation (DPP) events in landfalling tropical cyclones (TCs) globally and understand their impacts on overland precipitation.

Study Configuration

• Spatial Scale: Global for landfalling TCs, focusing on the inner-core to outer-rainband regions of individual TCs.
• Temporal Scale: Diurnal pulses, with data at 30-minute resolution; specific initiation times analyzed include 00–06 LST, 06–09 LST, and 09–15 LST.

Methodology and Data

• Models used: Not explicitly mentioned in the provided abstract.
• Data sources: 30-minute Integrated Multi-satellite Retrievals for GPM (IMERG) data set.

Main Results

• Overland DPP events account for approximately 30% of all landfalling TC days globally.
• A positive precipitation anomaly propagates radially outward from the inner-core to the outer-rainband region of TCs during these events, with enhanced precipitation along the path.
• Overland DPP signals initiate later (06–09 LST) than open-ocean DPP events (03–06 LST).
• Two distinct initiation times for overland DPP were identified:
  • Early morning (00–06 LST) primarily driven by convection-induced inertial gravity waves resulting from nocturnal long-wave radiative cooling enhancement of inner-core convection in strong TCs.
  • Near noon (09–15 LST) typically produced by weak TCs where inner-core convection peaks at noon due to short-wave radiative heating.
• TCs experiencing overland DPP events tend to produce wider rainfall distributions and more extreme rainfall, even in landfalling weak TCs.

Contributions

• Provides the first systematic identification and characterization of overland diurnal propagation of precipitation (DPP) events in landfalling tropical cyclones globally using high-resolution satellite data.
• Elucidates the distinct initiation times and underlying physical mechanisms (convection-induced inertial gravity waves vs. short-wave radiative heating) for overland DPP compared to open-ocean events.
• Highlights the significant impact of overland DPP on the spatial distribution and intensity of rainfall, demonstrating its role in producing wider and more extreme rainfall in landfalling TCs, including weak ones.

Funding

Not available in the provided abstract.

Citation

@article{Zhang2025Diurnal,
  author = {Zhang, X. L. and Guo, Shan and BAO, XuWei and Xu, Weixin},
  title = {Diurnal Propagation of Precipitation in Landfalling Tropical Cyclones},
  journal = {Journal of Geophysical Research Atmospheres},
  year = {2025},
  doi = {10.1029/2025jd044440},
  url = {https://doi.org/10.1029/2025jd044440}
}