Zheng et al. (2025) Comparative Study on Entrainment‐Mixing Mechanisms Between Cumulus Cores and Edges Based on Aircraft Observations

⚠️ 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: 2025-12-17
• Authors: Xiao Yu Zheng, Chunsong Lu, Lei Zhu, Sinan Gao, Liping Zeng, Xiaodong Yan, Yue Zhou, Jingjing Lv
• DOI: 10.1029/2025jd045059

Research Groups

The specific research groups or departments are not detailed in the provided abstract. The study is based on aircraft observations from the "Rain in Cumulus Over the Ocean project."

Short Summary

This study quantitatively analyzes entrainment-mixing mechanisms in cumulus cloud cores versus edges using aircraft observations, revealing that cores exhibit a higher homogeneous mixing degree and lower Damköhler number compared to edges, with these differences modulated by environmental and cloud conditions.

Objective

• To provide a quantitative observational analysis of entrainment-mixing mechanisms in cumulus cloud cores versus edges.

Study Configuration

• Spatial Scale: Cumulus cloud cores and edges (sub-cloud scale).
• Temporal Scale: Observational period during the "Rain in Cumulus Over the Ocean project" (specific duration not detailed in abstract).

Methodology and Data

• Models used: Not applicable; the study is observational.
• Data sources: Aircraft observations from the "Rain in Cumulus Over the Ocean project."

Main Results

• Cumulus cores exhibit larger liquid water content, larger cloud droplets, and smaller entrained droplet-free air parcels compared to edges.
• Cores consequently show a larger homogeneous mixing degree (ψ) and a smaller Damköhler number (Da, ratio of mixing time scale to droplet evaporation time scale).
• Quantitatively, ψ is 0.13 higher in cores than in edges.
• Quantitatively, Da is 3.3 lower in cores than in edges.
• Core-edge differences in ψ are influenced by environmental and cloud conditions:
  • Smaller cloud width reduces ψ and enhances the core-edge ψ contrast.
  • Weaker in-cloud vertical velocity reduces ψ and enhances the core-edge ψ contrast.
  • Lower environmental relative humidity reduces ψ and enhances the core-edge ψ contrast.
  • Lower aerosol concentration reduces ψ and enhances the core-edge ψ contrast.

Contributions

• Provides the first quantitative observational analysis of different entrainment-mixing mechanisms specifically comparing cumulus cores and edges, addressing a gap in existing literature.
• Offers valuable insights for improving the theoretical understanding and parameterizations of entrainment-mixing processes within cumulus clouds.

Funding

Not specified in the provided abstract.

Citation

@article{Zheng2025Comparative,
  author = {Zheng, Xiao Yu and Lu, Chunsong and Zhu, Lei and Gao, Sinan and Zeng, Liping and Yan, Xiaodong and Zhou, Yue and Lv, Jingjing},
  title = {Comparative Study on Entrainment‐Mixing Mechanisms Between Cumulus Cores and Edges Based on Aircraft Observations},
  journal = {Journal of Geophysical Research Atmospheres},
  year = {2025},
  doi = {10.1029/2025jd045059},
  url = {https://doi.org/10.1029/2025jd045059}
}