Next Article in Journal
Sensitivity Analysis of Surface Energy Budget to Albedo Parameters in Seoul Metropolitan Area Using the Unified Model
Previous Article in Journal
Continuous Detection of Diurnal Sodium Fluorescent Lidar over Beijing in China
Open AccessArticle

Integrated Correction Algorithm for X Band Dual-Polarization Radar Reflectivity Based on CINRAD/SA Radar

by Chao Wang 1,2, Chong Wu 2,*, Liping Liu 2, Xi Liu 3,4 and Chao Chen 5
1
School of Atmospheric Physics, Nanjing University of Information Science and Technology, Nanjing 210044, China
2
Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081, China
3
Key Laboratory of Transportation Meteorology, China Meteorological Administration, Nanjing 210009, China
4
Jiangsu Institute of Meteorological Sciences, Nanjing 210009, China
5
Guangdong Meteorological Observatory, Guangzhou 510640, China
*
Author to whom correspondence should be addressed.
Atmosphere 2020, 11(1), 119; https://doi.org/10.3390/atmos11010119
Received: 24 December 2019 / Revised: 8 January 2020 / Accepted: 14 January 2020 / Published: 20 January 2020
(This article belongs to the Section Atmospheric Techniques, Instruments, and Modeling)
The values of ratio a of the linear relationship between specific attenuation and specific differential phase vary significantly in convective storms as a result of resonance scattering. The best-linear-fit ratio a at X band is determined using the modified attenuation correction algorithm based on differential phase and attenuation, as well as the premise that reflectivity is unattenuated in S band radar detection. Meanwhile, the systemic reflectivity bias between the X band radar and S band radar and water layer attenuation (ZW) on the wet antenna cover of the X band radar are also considered. The good performance of the modified correction algorithm is demonstrated in a moderate rainfall event. The data were collected by four X band dual-polarization (X-POL) radar sites, namely, BJXCP, BJXFS, BJXSY, and BJXTZ, and a China’s New Generation Weather Radar (CINRAD/SA radar) site, BJSDX, in Beijing on 20 July 2016. Ratio a is calculated for each volume scan of the X band radar, with a mean value of 0.26 dB deg−1 varying from 0.20 to 0.31 dB deg−1. The average values of systemic reflectivity bias between the X band radar (at BJXCP, BJXFS, BJXSY, and BJXTZ) and S band radar (at BJSDX) are 0, −3, 2, and 0 dB, respectively. The experimentally determined ZW is in substantial agreement with the theoretically calculated ones, and their values are an order of magnitude smaller than rain attenuation. The comparison of the modified attenuation correction algorithm and the empirical-fixed-ratio correction algorithm is further evaluated at the X-POL radar. It is shown that the modified attenuation correction algorithm in the present paper provides higher correction accuracy for rain attenuation than the empirical-fixed-ratio correction algorithm. View Full-Text
Keywords: X band dual-polarization radar; rain attenuation correction; water layer attenuation X band dual-polarization radar; rain attenuation correction; water layer attenuation
Show Figures

Figure 1

MDPI and ACS Style

Wang, C.; Wu, C.; Liu, L.; Liu, X.; Chen, C. Integrated Correction Algorithm for X Band Dual-Polarization Radar Reflectivity Based on CINRAD/SA Radar. Atmosphere 2020, 11, 119.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop