A Comparison of Atmospheric Boundary Layer Height Determination Methods Using GNSS Radio Occultation Data

Author:

Qiu Cong12,Wang Xiaoming13ORCID,Li Haobo4ORCID,Zhou Kai1,Zhang Jinglei1,Li Zhe12,Liu Dingyi12,Yuan Hong1

Affiliation:

1. Aerospace Information Research Institute, Chinese Academy of Sciences, No.9 Dengzhuang South Road, Haidian District, Beijing 100094, China

2. School of Electronic, Electrical and Communicating Engineering, University of Chinese Academy of Sciences, No. 380 Huaibeizhuang, Huairou district, Beijing 101408, China

3. College of Resources and Environment, University of Chinese Academy of Sciences, No. 19A Yuquan Road, Shijingshan District, Beijing 100049, China

4. School of Science (Geospatial), RMIT University, Melbourne, VIC 3001, Australia

Abstract

The accurate determination of Atmospheric Boundary Layer Height (ABLH) is crucial in various atmospheric studies and practical applications. In this study, we present a comprehensive comparative analysis of five distinct methods for estimating ABLH using Global Navigation Satellite System (GNSS) Radio Occultation (RO) data. These methods encompass the use of bending angle and refractivity profiles, namely Minimum Gradient methods of the Bending Angle (MGBA) and Refractivity (MGR) profiles, breaking point, Wavelet Covariance Transform (WCT), and Double-Parameter Model Function (DPMF). GNSS-RO data from COSMIC-2 and Spire are used. To establish robust validation, radiosonde data are employed as a reference, ensuring the reliability of our findings. The results reveal notable variations in the performances of these ABLH estimation methods. Specifically, the MGBA, MGR, breaking point, and DPMF methods exhibit strong correlations with the reference data. Conversely, the WCT method displays weaker correlations, higher biases, and elevated root-mean-square-errors, suggesting limitations in capturing the true ABLH. Furthermore, we remove outlier screening to facilitate a comparison of the differences among the five methods. The WCT and DPMF methods can detect strong variations in the profiles near the Earth’s surface and consider them as ABLH. However, these variations are caused by errors. The MGBA method emerges as a reliable and stable option, while the WCT and DPMF methods should be used with caution due to the lower quality of the GNSS-RO profiles near the Earth’s surface.

Funder

Aerospace Information Research Institute

CAS Pioneer Hundred Talents Program

Publisher

MDPI AG

Subject

Atmospheric Science,Environmental Science (miscellaneous)

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