Identification

Title

Differential reflectivity calibration and antenna temperature

Abstract

Temporal differential reflectivity Z(dr) bias variations are investigated using the National Center for Atmospheric Research (NCAR) S-band dual-polarization Doppler radar (S-Pol). Using data from the Multi-Angle Snowflake Camera-Ready (MASCRAD) Experiment, S-Pol measurements over extended periods reveal a significant correlation between the ambient temperature at the radar site and the Z(dr) bias. Using radar scans of the sun and the ratio of cross-polar powers, the components of the radar that cause the variation of the Z(dr) bias are identified. It is postulated that the thermal expansion of the antenna is likely the primary cause of the observed Z(dr) bias variation. The cross-polar power (CP) Z(dr) calibration technique, which is based on the solar and cross-polar power measurements, is applied to data from the Plains Elevated Convection at Night (PECAN) field project. The Z(dr) bias from the CP technique is compared to vertical-pointing Z(dr) bias measurements, and the uncertainty of the Z(dr) bias estimates is given. An algorithm is derived to correct the radar data for the time-and temperature-varying Z(dr) bias. Bragg scatter measurements are used to corroborate the CP technique Z(dr) bias measurements.

Resource type

document

Resource locator

Unique resource identifier

code

http://n2t.net/ark:/85065/d7r213xc

codeSpace

Dataset language

eng

Spatial reference system

code identifying the spatial reference system

Classification of spatial data and services

Topic category

geoscientificInformation

Keywords

Keyword set

keyword value

Text

originating controlled vocabulary

title

Resource Type

reference date

date type

publication

effective date

2016-01-01T00:00:00Z

Geographic location

West bounding longitude

East bounding longitude

North bounding latitude

South bounding latitude

Temporal reference

Temporal extent

Begin position

End position

Dataset reference date

date type

publication

effective date

2017-09-01T00:00:00Z

Frequency of update

Quality and validity

Lineage

Conformity

Data format

name of format

version of format

Constraints related to access and use

Constraint set

Use constraints

Limitations on public access

None

Responsible organisations

Responsible party

contact position

OpenSky Support

organisation name

UCAR/NCAR - Library

full postal address

PO Box 3000

Boulder

80307-3000

email address

opensky@ucar.edu

web address

http://opensky.ucar.edu/

name: homepage

responsible party role

pointOfContact

Metadata on metadata

Metadata point of contact