The NOAA IR serves as an archival repository of NOAA-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by NOAA or funded partners.
As a repository, the NOAA IR retains documents in their original published format to ensure public access to scientific information.
i
An Inverse Mapping Table Method for Raindrop Size Distribution Parameters Retrieval Using X-band Dual-Polarization Radar Observations
-
2020
-
-
Source: IEEE Transactions on Geoscience and Remote Sensing ( Volume: 58, Issue: 11, Nov. 2020)
Details:
-
Journal Title:IEEE Transactions on Geoscience and Remote Sensing
-
Personal Author:
-
NOAA Program & Office:
-
Description:An inverse mapping table (IMT) method is proposed in this article to retrieve the raindrop size distribution (RSD) parameters from X-band polarimetric weather radar data. In the IMT method, a forward mapping database from three parameters of a gamma-type RSD to polarimetric radar variables is first built based on the scattering simulations under ideal atmospheric conditions, and then an inverse mapping database is derived. In particular, given a fixed shape parameter (μ) of RSD, the intersection of horizontal reflectivity (ZH) and differential reflectivity (Z DR ) contour lines is first obtained in the domain of total number concentration (N T ) and median volume diameter (MVD) D 0 ; and the inverse mapping relationship between Z H and Z DR to N T and D 0 at a fixed μ value is derived to form a single layer of IMT. Then, the monotonic relationship between μ and the specific differential propagation phase shift (KDP) or backscatter differential phase (δ C ) can aid in determining μ and a single layer of IMT. Thus, the inverse mapping database from polarimetric observations to the three gamma-type RSD parameters μ, NT, and D 0 can be established. Demonstration studies during a convective rainfall event and a large-scale rainfall event which occurred in northeastern China are carried out to examine the performance of this IMT method compared to a constrained-gamma (C-G) method that uses empirical relations between RSD parameters. The results show that the IMT method has a better performance in the convective case and similar performance in the large-scale continuous rainfall case.
-
Keywords:
-
Source:IEEE Transactions on Geoscience and Remote Sensing ( Volume: 58, Issue: 11, Nov. 2020)
-
DOI:
-
Document Type:
-
Rights Information:Other
-
Compliance:Submitted
-
Main Document Checksum:
-
Download URL:
-
File Type: