Kumar et al. (2026) An Atmosphere–Land–Ocean Coupled Global NWP System: Performance Evaluation for Potential Operational Use

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

Identification

• Journal: Geophysical Research Letters
• Year: 2026
• Date: 2026-06-27
• Authors: Sumit Kumar, Imranali M. Momin, Sukhwinder Kaur, Kondapalli Niranjan Kumar, Jonah Roberts‐Jones, Matthew J. Martin, John P. George, V. S. Prasad
• DOI: 10.1029/2025gl120923

Research Groups

• National Centre for Medium Range Weather Forecasting (NCMRWF)
• [Other research groups or departments involved in the study]

Short Summary

This study assesses the impact of ocean-atmosphere coupling on short- and medium-range forecasts of the Indian summer monsoon, demonstrating improved simulation of rainfall and SST variability with a newly configured coupled model.

Objective

• Investigate the influence of ocean-atmosphere coupling on the prediction of the July 2024 Indian summer monsoon

Study Configuration

• Spatial Scale: Regional scale over the Indian Ocean and surrounding landmasses
• Temporal Scale: Short- to medium-range forecasts (days to weeks)

Methodology and Data

• Models used: Coupled NCMRWF Unified Model (C-NCUM), operational atmosphere-land model (NCUM)
• Data sources: GPM rainfall, OSTIA SSTs, reanalysis-derived moisture fields

Main Results

• Improved simulation of monsoon rainfall and SST variability with the C-NCUM system
• Reduced widespread wet biases over the western equatorial Indian Ocean (WEIO) and the Core Monsoon Zone
• Enhanced representation of SST-convection interactions and moisture transport reduces spurious low-level convergence in uncoupled forecasts

Contributions

• Original value lies in demonstrating the importance of dynamic air-sea coupling for advancing monsoon prediction capability, highlighting potential improvements over existing models

Funding

• [List projects, programs, and reference codes that funded this research]
• Not specified in the provided text

Citation

@article{Kumar2026AtmosphereLandOcean,
  author = {Kumar, Sumit and Momin, Imranali M. and Kaur, Sukhwinder and Kumar, Kondapalli Niranjan and Roberts‐Jones, Jonah and Martin, Matthew J. and George, John P. and Prasad, V. S.},
  title = {An Atmosphere–Land–Ocean Coupled Global NWP System: Performance Evaluation for Potential Operational Use},
  journal = {Geophysical Research Letters},
  year = {2026},
  doi = {10.1029/2025gl120923},
  url = {https://doi.org/10.1029/2025gl120923}
}