Abo et al. (2026) Proposal for Simultaneous Sea Surface Wind Speed and Water Vapor Observations by Spaceborne IPDA-DIAL

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Identification

• Journal: Springer Link (Chiba Institute of Technology)
• Year: 2026
• Date: 2026-04-09
• Authors: Makoto Abo, Chikao Nagasawa, Yasukuni Shibata, Osamu Uchino, Tetsu Sakai, Takashi Shibata, Masaki KATSUMATA
• DOI: 10.1051/epjconf/202636208014/pdf

Research Groups

Not specified in the provided text.

Short Summary

The paper proposes a low-power, small-aperture spaceborne IPDA-DIAL system to measure water vapor and wind speed just above the ocean surface to improve numerical weather predictions.

Objective

• To develop a flexible spaceborne water vapor measurement method using IPDA-DIAL with reduced laser power and telescope aperture, and to enable simultaneous wind speed retrieval via sea surface backscatter coefficients.

Study Configuration

• Spatial Scale: From sea level to an altitude of 600 m.
• Temporal Scale: Snapshot measurements.

Methodology and Data

• Models used: IPDA-DIAL (Imaging Photon Counting Differential Absorption Lidar) using OPG/OPA transmitters (1350 nm band); measurement error simulations.
• Data sources: CALIPSO 1064 nm sea surface backscatter coefficient data (used for wind speed validation near a typhoon).

Main Results

• Simulation results indicate that the proposed IPDA-DIAL can measure water vapor from the sea surface up to 600 m with a measurement error of 7%.
• Demonstrated the feasibility of simultaneously measuring water vapor and wind speed by analyzing the backscatter coefficient at the sea surface.
• Validated the wind speed retrieval method using existing CALIPSO data in the vicinity of a typhoon.

Contributions

• Proposes a more flexible hardware configuration (lower power and smaller aperture) for spaceborne water vapor sensing.
• Introduces a method to observe both latent and sensible heat fluxes over the ocean in a single snapshot by combining water vapor and wind speed measurements.

Funding

Not specified in the provided text.

Citation

@article{Abo2026Proposal,
  author = {Abo, Makoto and Nagasawa, Chikao and Shibata, Yasukuni and Uchino, Osamu and Sakai, Tetsu and Shibata, Takashi and KATSUMATA, Masaki},
  title = {Proposal for Simultaneous Sea Surface Wind Speed and Water Vapor Observations by Spaceborne IPDA-DIAL},
  journal = {Springer Link (Chiba Institute of Technology)},
  year = {2026},
  doi = {10.1051/epjconf/202636208014/pdf},
  url = {https://doi.org/10.1051/epjconf/202636208014/pdf}
}