Preprints
https://doi.org/10.5194/egusphere-2025-630
https://doi.org/10.5194/egusphere-2025-630
27 Feb 2025
 | 27 Feb 2025

Decoupling the PBL Height, the Mixing Layer Height, and the Aerosol Layer Top in LiDAR Measurements over Chiang Mai, Northern Thailand

Ronald Macatangay, Thiranan Sonkaew, Sherin Hassan Bran, Worapop Thongsame, Titaporn Supasri, Mana Panya, Jeerasak Longmali, Raman Solanki, Ben Svasti Thomson, and Achim Haug

Abstract. Accurate determination of the planetary boundary layer (PBL) height, mixing layer height (MLH), and aerosol layer top (ALT) is critical for air quality and climate studies, especially in regions with complex aerosol dynamics like Chiang Mai, northern Thailand. This study develops a novel LiDAR-based methodology that incorporates a temperature-based dynamic maximum analysis altitude (MAA) to decouple these layers, addressing the limitations of conventional methods such as the Haar Wavelet Covariance Transform (WCT). Traditional fixed-altitude approaches often misclassify the ALT as the PBL height, particularly during nighttime or transition periods, leading to significant overestimations. By dynamically adjusting the MAA based on surface temperature variations, the proposed approach effectively distinguishes the PBL from residual aerosol layers and cloud interference. Comparison against radiosonde data and WRF-Chem simulations demonstrates strong agreement, with LiDAR-derived PBL heights showing improved diurnal resolution and accuracy. However, model simulations tend to overestimate the PBL height during high aerosol events, highlighting the need for refined aerosol-radiation interaction parameterizations. This study underscores the importance of integrating thermodynamic and aerosol data for accurate boundary layer characterization and provides a robust framework for improving air quality and climate models in regions with high aerosol loading and complex topography. These findings have implications for enhancing pollutant transport analysis and advancing LiDAR-based remote sensing techniques in Southeast Asia.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this paper. While Copernicus Publications makes every effort to include appropriate place names, the final responsibility lies with the authors. Views expressed in the text are those of the authors and do not necessarily reflect the views of the publisher.
Share

Journal article(s) based on this preprint

10 Sep 2025
Temperature-constrained lidar retrieval of planetary boundary layer height over Chiang Mai, Thailand
Ronald Macatangay, Thiranan Sonkaew, Sherin Hassan Bran, Worapop Thongsame, Titaporn Supasri, Mana Panya, Jeerasak Longmali, Raman Solanki, Ben Svasti Thomson, and Achim Haug
Atmos. Meas. Tech., 18, 4347–4356, https://doi.org/10.5194/amt-18-4347-2025,https://doi.org/10.5194/amt-18-4347-2025, 2025
Short summary
Ronald Macatangay, Thiranan Sonkaew, Sherin Hassan Bran, Worapop Thongsame, Titaporn Supasri, Mana Panya, Jeerasak Longmali, Raman Solanki, Ben Svasti Thomson, and Achim Haug

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2025-630', Anonymous Referee #1, 06 May 2025
    • AC1: 'Reply on RC1: Author Responses on “Decoupling the PBL Height, the Mixing Layer Height, and the Aerosol Layer Top in LiDAR Measurements over Chiang Mai, Northern Thailand”', Ronald Macatangay, 16 May 2025
  • RC2: 'Comment on egusphere-2025-630', Anonymous Referee #2, 17 Jun 2025
    • AC2: 'Reply on RC2', Ronald Macatangay, 23 Jun 2025
    • AC1: 'Reply on RC1: Author Responses on “Decoupling the PBL Height, the Mixing Layer Height, and the Aerosol Layer Top in LiDAR Measurements over Chiang Mai, Northern Thailand”', Ronald Macatangay, 16 May 2025

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2025-630', Anonymous Referee #1, 06 May 2025
    • AC1: 'Reply on RC1: Author Responses on “Decoupling the PBL Height, the Mixing Layer Height, and the Aerosol Layer Top in LiDAR Measurements over Chiang Mai, Northern Thailand”', Ronald Macatangay, 16 May 2025
  • RC2: 'Comment on egusphere-2025-630', Anonymous Referee #2, 17 Jun 2025
    • AC2: 'Reply on RC2', Ronald Macatangay, 23 Jun 2025
    • AC1: 'Reply on RC1: Author Responses on “Decoupling the PBL Height, the Mixing Layer Height, and the Aerosol Layer Top in LiDAR Measurements over Chiang Mai, Northern Thailand”', Ronald Macatangay, 16 May 2025

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
AR by Ronald Macatangay on behalf of the Authors (24 Jun 2025)  Author's response   Author's tracked changes   Manuscript 
ED: Publish as is (07 Jul 2025) by Edward Nowottnick
AR by Ronald Macatangay on behalf of the Authors (08 Jul 2025)

Journal article(s) based on this preprint

10 Sep 2025
Temperature-constrained lidar retrieval of planetary boundary layer height over Chiang Mai, Thailand
Ronald Macatangay, Thiranan Sonkaew, Sherin Hassan Bran, Worapop Thongsame, Titaporn Supasri, Mana Panya, Jeerasak Longmali, Raman Solanki, Ben Svasti Thomson, and Achim Haug
Atmos. Meas. Tech., 18, 4347–4356, https://doi.org/10.5194/amt-18-4347-2025,https://doi.org/10.5194/amt-18-4347-2025, 2025
Short summary
Ronald Macatangay, Thiranan Sonkaew, Sherin Hassan Bran, Worapop Thongsame, Titaporn Supasri, Mana Panya, Jeerasak Longmali, Raman Solanki, Ben Svasti Thomson, and Achim Haug
Ronald Macatangay, Thiranan Sonkaew, Sherin Hassan Bran, Worapop Thongsame, Titaporn Supasri, Mana Panya, Jeerasak Longmali, Raman Solanki, Ben Svasti Thomson, and Achim Haug

Viewed

Total article views: 547 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
463 67 17 547 15 28
  • HTML: 463
  • PDF: 67
  • XML: 17
  • Total: 547
  • BibTeX: 15
  • EndNote: 28
Views and downloads (calculated since 27 Feb 2025)
Cumulative views and downloads (calculated since 27 Feb 2025)

Viewed (geographical distribution)

Total article views: 539 (including HTML, PDF, and XML) Thereof 539 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 10 Sep 2025
Download

The requested preprint has a corresponding peer-reviewed final revised paper. You are encouraged to refer to the final revised version.

Short summary
Air pollution affects climate and health, but accurately measuring how pollutants mix in the atmosphere remains challenging. In Chiang Mai, Thailand, we developed a new LiDAR-based method to better distinguish key atmospheric layers by incorporating temperature-based adjustments. This improves accuracy, especially at night, compared to traditional techniques. Our findings help refine air quality models and provide better data for tackling pollution in Southeast Asia.
Share