Kim et al. (2025) An Airborne G-Band Water Vapor Radiometer and Dropsonde Validation of Reanalysis and NWP Precipitable Water Vapor over the Korean Peninsula

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

Identification

• Journal: Remote Sensing
• Year: 2025
• Date: 2025-11-21
• Authors: Min‐Seong Kim, Tae-Young Goo
• DOI: 10.3390/rs17233788

Research Groups

• Korean meteorological agencies/research institutes (developers of LDAPS and KLAPS)
• European Centre for Medium-Range Weather Forecasts (ECMWF)
• National Aeronautics and Space Administration (NASA)

Short Summary

This study conducted a unique airborne validation of hourly Precipitable Water Vapor (PWV) from local Numerical Weather Prediction (NWP) models and global reanalysis datasets over the Korean Peninsula, revealing that ERA5 provides the most accurate representation while local models exhibit significant dry biases, especially in moist and cloudy conditions.

Objective

• To validate the accuracy of hourly Precipitable Water Vapor (PWV) representations in two local Numerical Weather Prediction (NWP) models (LDAPS, KLAPS) and two global reanalysis datasets (ERA5, MERRA-2) over the Korean Peninsula using airborne measurements.

Study Configuration

• Spatial Scale: Regional (Korean Peninsula) for validation; models cover local and global scales.
• Temporal Scale: Hourly

Methodology and Data

• Models used: Local Data Assimilation and Prediction System (LDAPS), Korea Local Analysis and Prediction System (KLAPS), ECMWF Reanalysis v5 (ERA5), Modern-Era Retrospective Analysis for Research and Applications, Version 2 (MERRA-2).
• Data sources: Airborne G-band Water Vapor Radiometer (GVR), dropsondes. A rigorous multi-stage quality control (QC) procedure was applied to all data.

Main Results

• The ERA5 reanalysis consistently provided the most accurate representation of both upper-air and total column Precipitable Water Vapor (PWV) compared to airborne measurements.
• High-resolution local models (LDAPS and KLAPS) exhibited significant dry biases, particularly under moist and cloudy atmospheric conditions.
• Two validation strategies were employed: comparing GVR-measured upper-column PWV against model layers, and comparing a total-column GVR–dropsonde composite against the models’ total PWV.

Contributions

• Presents a unique airborne validation of hourly Precipitable Water Vapor (PWV) over the meteorologically complex Korean Peninsula.
• Demonstrates the value of airborne validation for assessing model performance in challenging regions.
• Establishes ERA5 as a more reliable benchmark for water vapor analysis over Korea compared to current local NWP models.
• Highlights the critical need for improvements in humidity assimilation and microphysics schemes within regional forecasting systems.

Funding

Not specified in the provided text.

Citation

@article{Kim2025Airborne,
  author = {Kim, Min‐Seong and Goo, Tae-Young},
  title = {An Airborne G-Band Water Vapor Radiometer and Dropsonde Validation of Reanalysis and NWP Precipitable Water Vapor over the Korean Peninsula},
  journal = {Remote Sensing},
  year = {2025},
  doi = {10.3390/rs17233788},
  url = {https://doi.org/10.3390/rs17233788}
}