Navale et al. (2025) Investigating Land‐Atmosphere Interactions in the North West Himalaya Through Recycled Precipitation: Seasonal Dynamics, Trends, and Topographic Impacts

⚠️ 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: 2025-10-16
• Authors: Ashish Navale, L. Karthikeyan
• DOI: 10.1029/2025jd043581

Research Groups

Not explicitly mentioned in the abstract.

Short Summary

This study investigates land-atmosphere interactions and their trends in the North West Himalaya (NWH) over two decades (2001–2020) using the WRF model, revealing a high summer recycling ratio and varying links between terrestrial and atmospheric segments influenced by topography and seasonality.

Objective

• To examine the link between terrestrial and atmospheric segments of land-atmosphere interactions and their trends in summer and winter over two decades (2001–2020) in the North West Himalaya (NWH).

Study Configuration

• Spatial Scale: North West Himalaya (NWH), with simulations at 10 km resolution.
• Temporal Scale: Two decades (2001–2020), focusing on summer and winter seasons.

Methodology and Data

• Models used: Weather Research and Forecasting (WRF) model, coupled with an Eulerian water vapor tagging tool.
• Data sources: WRF model simulations of terrestrial and atmospheric variables.

Main Results

• A high recycling ratio of 0.3 was observed during summer, attributed to high availability of thermal energy.
• Recycled precipitation is higher at lower elevations during summer and at higher elevations during winter.
• High soil moisture (SM)-latent heat flux sensitivity is observed in the foothills during both summer and winter.
• In the higher Himalaya, high SM-latent heat flux sensitivity is observed only in summer, as the region is predominantly snow-covered during winter.
• Sub-seasonal variations in SM modify energy partitioning, influencing near-surface air temperature and atmospheric moisture, which ultimately affects recycled precipitation.
• Although the terrestrial segment of land-atmosphere interactions showed significant trends, these trends do not always affect the trends of the atmospheric segment.
• The nature of trends in both terrestrial and atmospheric segments is influenced by location, topography, and seasonality.

Contributions

• Provides a detailed examination of land-atmosphere interactions and their trends in the complex North West Himalaya region over a two-decade period.
• Utilizes an Eulerian water vapor tagging tool coupled with the WRF model to characterize the atmospheric segment via recycled precipitation.
• Quantifies the link between terrestrial (soil moisture-latent heat flux sensitivity) and atmospheric (recycled precipitation) segments, highlighting regional and seasonal variations.
• Demonstrates the significant influence of topography, seasonality, and sub-seasonal soil moisture variations on these interactions and their observed trends.

Funding

Not mentioned in the abstract.

Citation

@article{Navale2025Investigating,
  author = {Navale, Ashish and Karthikeyan, L.},
  title = {Investigating Land‐Atmosphere Interactions in the North West Himalaya Through Recycled Precipitation: Seasonal Dynamics, Trends, and Topographic Impacts},
  journal = {Journal of Geophysical Research Atmospheres},
  year = {2025},
  doi = {10.1029/2025jd043581},
  url = {https://doi.org/10.1029/2025jd043581}
}