AMMBLWV: Marine Boundary Layer Water Vapor from Satellite Fusion

Monthly 1-degree gridded data provides estimates of water vapor in the marine atmospheric boundary layer beneath uniform cloud fields. The dataset is derived by combining total column water vapor from AMSR-E and AMSR-2 microwave radiometers with above-cloud water vapor from MODIS near-infrared imagery. This difference method isolates the vapor between the ocean surface and cloud top for analysis of lower atmospheric conditions.

Use Cases

• Validating climate model simulations of marine boundary layer humidity based on satellite-derived vapor estimates.
• Studying the relationship between boundary layer water vapor and low cloud formation over oceans.
• Analyzing spatial and temporal trends in pre-cloud atmospheric moisture for climate monitoring.
• Assimilating observational data on sub-cloud humidity into numerical weather prediction models.

Strengths

• Uses a Version 2 methodology with improved screening for high clouds, suggesting refined data quality.
• Integrates data from two established satellite instrument families (AMSR and MODIS) for a fused product.
• Is hosted on multiple authoritative platforms (NASA's data.gov and Earthdata), indicating vetting and importance.

Limitations

• Critical metadata is sparse or conflicting: row/column counts and exact license terms are unknown, and last update dates conflict between 2017 and a future 2026 date.
• The methodology is limited to uniform cloud fields, excluding complex or multi-layered cloud scenes.
• Data is provided at a coarse 1-degree monthly resolution, which may not capture finer-scale processes.

Provenance

Source

National Aeronautics and Space Administration (NASA)

Collection Method

Satellite remote sensing via microwave radiometry (AMSR-E/AMSR-2) and near-infrared imagery (MODIS).

Freshness

2026-04-10 16:36:30.518830 (from data.gov, but this is a future date, indicating a potential metadata error)

Geography

Global marine/coastal regions.