scholarly journals Assessment of Ground‐Based X‐Band Radar Reflectivity: Attenuation Correction and its Comparison With Space‐Borne Radars Over the Western Ghats, India

2020 ◽  
Vol 7 (11) ◽  
Author(s):  
Subrata Kumar Das ◽  
U. V. Murali Krishna ◽  
Yogesh K. Kolte ◽  
Sachin M. Deshpande ◽  
G. Pandithurai
Keyword(s):  
Attenuation Correction ◽  
Western Ghats ◽  
Radar Reflectivity ◽  
X Band ◽  
The Western Ghats

scholarly journals Attenuation Correction of X-Band Radar Reflectivity Using Adjacent Multiple Microwave Links

2020 ◽  
Vol 12 (13) ◽  
pp. 2133
Author(s):  
Min-Seong Kim ◽  
Byung Hyuk Kwon
Keyword(s):  
Attenuation Correction ◽  
Rain Attenuation ◽  
Physical Structure ◽  
Radar Reflectivity ◽  
Correction Coefficient ◽  
Polarimetric Radar ◽  
Weather Radars ◽  
X Band ◽  
Rainfall Type ◽  
Microwave Link

Rain attenuation can hinder the implementation of quantitative precipitation estimations using X-band weather radar. Numerous studies have been conducted on correcting the attenuation of radar reflectivity by utilizing a dual-polarimetric radar and an arbitrary-oriented microwave link; however, there is a need to optimize the required number of microwave links and their locations. In this study, we tested four attenuation correction methods and proposed a novel algorithm based on the sole use of adjacent multiple microwave links. The attenuation of the X-band radar reflectivity was corrected by performing forward iterations at each link, and the correction coefficients were statistically analyzed to reduce the instability problem. The algorithms of each method were evaluated by studying the cases of convective and stratiform rainfall, and then validated by comparing the corrected reflectivity of the X-band radar with the qualitatively controlled reflectivity of the S-band radar. The new method was as efficient as the conventional method based on the specific differential phase of dual-polarimetric radar. Furthermore, the correction coefficient was more effectively optimized and stabilized using seven microwave links rather than a single link, and no further independent reference data were required. In addition, the attenuation correction also accounted for spatiotemporal differentiation depending on the rainfall type, and could recover the physical structure of the rainfall. The method developed herein can facilitate estimations of quantitative rainfall in developing countries where dual-polarization weather radars are not common. The exploitation of microwave link data is a promising method for rainfall remote sensing.

scholarly journals Attenuation Correction of Weather Radar Reflectivity with Arbitrary Oriented Microwave Link

2017 ◽  
Vol 2017 ◽  
pp. 1-17 ◽  
Author(s):  
Peng Zhang ◽  
Xichuan Liu ◽  
Zhaoming Li ◽  
Zeming Zhou ◽  
Kun Song ◽  
...  
Keyword(s):  
Attenuation Correction ◽  
Real Data ◽  
Radar Reflectivity ◽  
Attenuation Effect ◽  
Rain Gauges ◽  
X Band ◽  
Variation Range ◽  
Microwave Link ◽  
Rain Rates ◽  
Key Parameter

To compensate radar reflectivity for attenuation effect, a new method for attenuation correction of the radar reflectivity using arbitrary oriented microwave link (referred henceforth to as ACML) is developed and evaluated. Referring to the measurement of arbitrary oriented microwave link, the ACML method optimizes the ratio of specific attenuation to specific differential phase which is a key parameter in attenuation correction schemes. The proposed method was evaluated using real data of a dual-polarization X-band radar and measurements of two microwave links during two rainstorm events. The results showed that the variation range of the optimized ratio was overall consistent with the results of the previous studies. After attenuation correction with the optimal ratios, the radar reflectivity was significantly compensated, especially at long distances. The corrected reflectivity was more intense than the reflectivity corrected by the “self-consistent” (SC) method and closer to the reflectivity of a nearby S-band radar. The effectiveness of the method was also verified by comparing the rain rates estimated by the X-band radar with those derived by rain gauges. It is demonstrated that arbitrary oriented microwave link can be adopted to optimize the attenuation correction of radar reflectivity.

New locality records and call description of the Resplendent Shrub Frog Raorchestes resplendens (Amphibia: Anura: Rhacophoridae) from the Western Ghats, India

2020 ◽  
Vol 12 (11) ◽  
pp. 16502-16509
Author(s):  
Sandeep Das ◽  
K.P. Rajkumar ◽  
K.A. Sreejith ◽  
M. Royaltata ◽  
P.S. Easa
Keyword(s):  
Endangered Species ◽  
Western Ghats ◽  
Small Area ◽  
Grassland Ecosystem ◽  
Critically Endangered Species ◽  
Controlled Burning ◽  
New Locations ◽  
Southern Western Ghats ◽  
First Time ◽  
The Western Ghats

Abstract: The Resplendent Shrub Frog, Raorchestes resplendens Biju, Shouche, Dubois, Dutta, & Bossuyt, 2010 is a Critically Endangered species endemic to the Western Ghats and was considered to be restricted to a three-square kilometer patch atop Anamudi summit.  In this study, we report 36 new locations of the species from the Anamalai massif of the southern Western Ghats.  Niche-based prediction modelling suggests that the species is restricted to Anamalai massif.  The call description of this frog is also provided for the first time. The preferred microhabitat of the frog is Chrysopogon grass clumps in the marshy/swampy montane grassland ecosystem. Restricted to a small area with controlled burning management practiced in its habitat, R. resplendens needs immediate attention.

DNA barcoding of important fruit tree species of agronomic interest in the genus Garcinia L. from the Western Ghats

2021 ◽  
Author(s):  
Jayesh Anerao ◽  
Vikas Jha ◽  
Nishaat Shaikh ◽  
Apurva Shivalkar ◽  
Aishwarya Nityanand ◽  
...  
Keyword(s):  
Dna Barcoding ◽  
Tree Species ◽  
Western Ghats ◽  
Fruit Tree ◽  
The Western Ghats

A new species of the previously monotypic genus Iningainema (Cyanobacteria, Scytonemataceae) from the Western Ghats, India

2021 ◽  
pp. 1-11
Author(s):  
Yevhen Maltsev ◽  
Elena Kezlya ◽  
Svetlana Maltseva ◽  
Balasubramanian Karthick ◽  
Petr Dvořák ◽  
...  
Keyword(s):  
New Species ◽  
Western Ghats ◽  
Monotypic Genus ◽  
The Western Ghats ◽  
A New Species
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