Qin et al. (2025) Sensitivity Differences Between 118 GHz and 183 GHz Radiance in All‐Sky Assimilation With Hydrometeor Control Variables and the Impact on a Typhoon Structure Forecast

⚠️ 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: 2025-11-12
• Authors: Luyao Qin, Xiaoping Cheng, Jianfang Fei, Yaodeng Chen, Xiaogang Huang
• DOI: 10.1029/2025jd043328

Research Groups

Not explicitly stated in the abstract.

Short Summary

This study investigates the comparative impacts of separate and joint assimilation of 118 GHz and 183 GHz Microwave Humidity Sounder-II (MWHS-II) channels on hydrometeor analysis and forecasting of Typhoon Lekima (2019). Joint assimilation significantly improves the representation of temperature, humidity, and hydrometeor distribution, enhancing typhoon intensity forecasting and understanding of its structure.

Objective

• To investigate the comparative impacts of separate and joint assimilation of 118 GHz and 183 GHz Microwave Humidity Sounder-II (MWHS-II) channels on hydrometeor analysis and forecasting of Typhoon Lekima (2019).
• To understand how directly adjusting hydrometeor analysis for thermodynamic consistency influences the analysis and forecasting of tropical cyclones.

Study Configuration

• Spatial Scale: Regional, focused on Typhoon Lekima (2019).
• Temporal Scale: The period of Typhoon Lekima's activity in 2019.

Methodology and Data

• Models used: Numerical weather prediction (NWP) system incorporating hydrometeor control variables for data assimilation. (Specific model name not provided in abstract).
• Data sources: Microwave Humidity Sounder-II (MWHS-II) radiance data from the FengYun-3 satellite (channels near 118 GHz and 183 GHz absorption bands).

Main Results

• The 183 GHz band exhibits higher sensitivity to solid hydrometeors at higher atmospheric levels.
• The 118 GHz band shows greater sensitivity to liquid hydrometeors at lower atmospheric levels.
• Joint assimilation of both 118 GHz and 183 GHz channels improves the representation of temperature, humidity, and hydrometeor distribution.
• This enhanced representation leads to improved analysis and forecasting of typhoon intensity and a deeper understanding of typhoon structure.
• The sensitivity of the 183 GHz band to solid hydrometeors provides valuable insights into their role in the secondary eyewall formation for Typhoon Lekima (2019).

Contributions

• Addresses the insufficient exploration of comparative impacts of 118 GHz and 183 GHz channel assimilation on hydrometeor fields.
• Demonstrates the potential of synergistic assimilation of MWHS-II channels, utilizing hydrometeor control variables, for advancing tropical cyclone analysis, forecasting, and understanding of dynamics.
• Provides specific insights into the role of solid hydrometeors in secondary eyewall formation using 183 GHz data.

Funding

Not explicitly stated in the abstract.

Citation

@article{Qin2025Sensitivity,
  author = {Qin, Luyao and Cheng, Xiaoping and Fei, Jianfang and Chen, Yaodeng and Huang, Xiaogang},
  title = {Sensitivity Differences Between 118 GHz and 183 GHz Radiance in All‐Sky Assimilation With Hydrometeor Control Variables and the Impact on a Typhoon Structure Forecast},
  journal = {Journal of Geophysical Research Atmospheres},
  year = {2025},
  doi = {10.1029/2025jd043328},
  url = {https://doi.org/10.1029/2025jd043328}
}