Lan et al. (2025) The GLACE-Hydrology Experiment: Effects of Land–Atmosphere Coupling on Precipitation Change and Monsoonal Circulations

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

Identification

• Journal: Journal of Climate
• Year: 2025
• Date: 2025-12-29
• Authors: Chia-Wei Lan, Sanjiv Kumar, Min-Hui Lo
• DOI: 10.1175/jcli-d-25-0275.1

Research Groups

Not specified in the provided abstract.

Short Summary

This study investigates the impact of land-atmosphere interactions on rainfall and monsoon intensity using coupled and uncoupled CESM simulations. It finds that while most land regions show higher temperatures and reduced precipitation in coupled simulations, monsoon regions experience increased precipitation due to enhanced vertical motion and strengthened monsoonal circulation.

Objective

• To investigate the role of land-atmosphere interactions in modulating rainfall and monsoon intensity.
• To identify the mechanisms driving changes in rainfall and monsoon dynamics due to land-atmosphere coupling.
• To develop a novel framework for assessing how land-atmosphere interactions modulate monsoon dynamics by integrating moist static energy (MSE) profiles with the Webster–Yang monsoon index.

Study Configuration

• Spatial Scale: Regional to continental (e.g., central North America, southern Europe, the Sahel, India, Indian subcontinent).
• Temporal Scale: Climatological (influencing regional climate patterns, monsoon variability, future climate changes).

Methodology and Data

• Models used: Community Earth System Model (CESM).
• Data sources: Output from coupled and uncoupled CESM simulations. Analysis techniques include moisture budget analysis, moist static energy (MSE) profiling, and the Webster–Yang monsoon index.

Main Results

• Coupled simulations generally lead to higher temperatures and reduced precipitation across most land regions.
• Monsoon regions exhibit increased precipitation in coupled simulations, driven by enhanced vertical motion and strengthened monsoonal circulation.
• Mechanisms identified include intensified horizontal moisture advection and a stronger dynamic component over the Indian subcontinent.
• Increases in midtropospheric moisture and changes in atmospheric stability are key factors enhancing vertical motion and precipitation.
• The study introduces a novel framework integrating MSE profiles with the Webster–Yang monsoon index to assess land-atmosphere interactions on monsoon dynamics.

Contributions

• Provides a novel framework for assessing land-atmosphere interactions' modulation of monsoon dynamics by integrating moist static energy (MSE) profiles with the Webster–Yang monsoon index.
• Enhances understanding of the crucial role of land-atmosphere coupling in regional precipitation changes, particularly in monsoon-sensitive areas.
• Offers insights for improving climate model simulations, especially for predicting future climate changes in regions highly sensitive to monsoon variability.

Funding

Not specified in the provided abstract.

Citation

@article{Lan2025GLACEHydrology,
  author = {Lan, Chia-Wei and Kumar, Sanjiv and Lo, Min-Hui},
  title = {The GLACE-Hydrology Experiment: Effects of Land–Atmosphere Coupling on Precipitation Change and Monsoonal Circulations},
  journal = {Journal of Climate},
  year = {2025},
  doi = {10.1175/jcli-d-25-0275.1},
  url = {https://doi.org/10.1175/jcli-d-25-0275.1}
}