Dual-Polarization and Dual-Wavelength Radar Measurements Vivek National Center for Atmospheric Research Boulder, Colorado I.Polarization and dual- wavelength.

Slides:

Advertisements

Similar presentations

Robin Hogan, Chris Westbrook University of Reading Lin Tian NASA Goddard Space Flight Center Phil Brown Met Office Why it is important that ice particles.

Advertisements

Radar/lidar observations of boundary layer clouds

DYMECS: Dynamical and Microphysical Evolution of Convective Storms (NERC Standard Grant) University of Reading: Robin Hogan, Bob Plant, Thorwald Stein,

POLARIMETRIC RADAR IMPROVEMENTS

Weather radar equations To convert equations for distributed targets into weather radar equations, we must determine the radar reflectivity of arrays of.

Cloud Radar in Space: CloudSat While TRMM has been a successful precipitation radar, its dBZ minimum detectable signal does not allow views of light.

Relationship of the Reflectivity Factor to other Meteorological Quantities Precipitation content (W): The mass of condensed water substance (water or ice)

7. Radar Meteorology References Battan (1973) Atlas (1989)

Retrieval and Application of Raindrop Size Distributions From Polarimetric Radar and Disdrometer Data for Sub-synoptic Scale Systems Petar Bukovčić 1,3,4,

ATS 351 Lecture 9 Radar. Radio Waves Electromagnetic Waves Consist of an electric field and a magnetic field Polarization: describes the orientation.

X-band About the CSU-CHILL Radar The CSU-CHILL National Weather Radar Facility, located in Greeley, CO, is an advanced, transportable dual-polarized, dual-wavelength.

Water vapor estimates using simultaneous S and Ka band radar measurements Scott Ellis, Jothiram Vivekanandan NCAR, Boulder CO, USA.

Single Frequency Observations of Warm Clouds and Precipitation Edward Luke with Pavlos Kollias, Frederic Tridon, Stefan Kneifel, and Alessandro Battaglia.

Clear air echoes (few small insects) -12 dBZ. Echoes in clear air from insects Common is summer. Watch for echoes to expand area as sun sets and insects.

DUAL-POLARIZATION OF WSR-88D NETWORK

Rainfall Monitioring Using Dual-polarization Radars Alexander Ryzhkov National Severe Storms Laboratory / University of Oklahoma, USA.

Robin Hogan Anthony Illingworth Marion Mittermaier Ice water content from radar reflectivity factor and temperature.

1 Radar Displays PPI - Plan position Indicator Maps the received signals on polar coordinates in plan view. The antenna scans 360° at fixed elevation angle.

What can Dual-Polarization Doppler Radar Do for You? Neil Fox Department of Atmospheric Science University of Missouri - Columbia.

High-Resolution X-band Dual-Polarization Weather Radar: Theory and Applications Sense and Nonsense on precipitation and drop size distribution estimation.

Dual Polarization Radars

Spaceborne Weather Radar

Basic RADAR Principles Prof. Sandra Cruz-Pol, Ph.D. Electrical and Computer Engineering UPRM.

Review Doppler Radar (Fig. 3.1) A simplified block diagram 10/29-11/11/2013METR

Remote-sensing of the environment (RSE) ATMOS Analysis of the Composition of Clouds with Extended Polarization Techniques L. Pfitzenmaier, H. Russchenbergs.

Bryan A. Baum 1 Ping Yang 2, Andrew Heymsfield 3 1 NASA Langley Research Center, Hampton, VA 2 Texas A&M University, College Station, TX 3 National Center.

The Shape-Slope Relation in Observed Gamma Raindrop Size Distributions: Statistical Error or Useful Information?* Shaunna Donaher MPO 531 February 28,

In this work we present results of cloud electrification obtained with the RAMS model that includes the process of charge separation between ice particles.

Dual Polarization Martin Hagen, Elena Saltikoff Deutsches Zentrum für Luft- und Raumfahrt (DLR) Oberpfaffenhofen, Germany Finnish Meteorological Institute.

Radar Polarimetric Retrievals. Anthony Illingworth University of Reading, UK.

Polarization I: Radar concepts and ZDR part I. Dual polarization radars can estimate several return signal properties beyond those available from conventional,

National Weather Service Dual-Polarization Radar Technology Photo courtesy of NSSL.

Measurements of raindrop-size distributions from dual-polarization spectral observations Dmitri Moisseev and V. Chandrasekar Colorado State University.

The Role of Polarimetric Radar for Validating Cloud Models Robert Cifelli 1, Timothy Lang 1, Stephen Nesbitt 1, S.A. Rutledge 1 S. Lang 2, and W.K. Tao.

Precipitation studies with RADARS and use of WP/RASS By S.H. Damle.

Analysis of microphysical data in an orographic environment to evaluate a polarization radar-based hydrometeor classification scheme Sabine Göke, David.

The three-dimensional structure of convective storms Robin Hogan John Nicol Robert Plant Peter Clark Kirsty Hanley Carol Halliwell Humphrey Lean Thorwald.

Department of Mechanical Engineering The Pearlstone Center for Aeronautical Engineering Studies Ben-Gurion University of the Negev P.O.B. 653, Beer Sheva.

RAdio Detection And Ranging. Was originally for military use 1.Sent out electromagnetic radiation (Active) 2.Bounced off an object and returned to a listening.

Remote Sensing of Precipitation A Look at Radar Now and in the Future Western South Dakota Hydrology Conference 23 April 2009 Darren R. Clabo Institute.

Dual-Aircraft Investigation of the inner Core of Hurricane Norbert. Part Ⅲ : Water Budget Gamache, J. F., R. A. Houze, Jr., and F. D. Marks, Jr., 1993:

Rain Detection & Attenuation for Remote sensing; & auxiliary sensors

Comparisons between polarimetric radar observations and convective-scale simulations of HyMeX first special observing period PhD student under the supervision.

Precipitation Precipitation refers to any product of the condensation of atmospheric water vapour that is deposited on the Earth's surface. Precipitation.

III) CHARACTERISTICS OF THE ADDED CLUTTER RAIN MeteoSvizzera, 6605 Locarno, Switzerland Simulation.

Radiometer Physics GmbH

Drizzle measurements with the HSRL and the KAZR: sensitivity to assumptions Ed Eloranta University of Wisconsin-Madison

S-Band Radar Dual-Polarization Observations of Winter Storms P. C. Kennedy and S. A. Rutledge CSU-CHILL Radar Facility.

What does radar measure? Hydrometeors: rain drops, ice particles Other objects: e.g. birds, insects.

A Global Rainfall Validation Strategy Wesley Berg, Christian Kummerow, and Tristan L’Ecuyer Colorado State University.

Tele-Conference with Lincoln Labs: Icing Hazard Level National Center for Atmospheric Research 29 April 2010.

Dual-Polarization Radars

S. Hachani 1,2,B. Boudevillain 1, Z. Bargaoui 2, and G. Delrieu 1 1 University of Grenoble(UJF/ LTHE ) 2 University Tunis el Manar (ENIT/LMHE) EGU, General.

Radar Requirements David J. Stensrud NOAA/National Severe Storms Laboratory 2013 Warn-on-Forecast Workshop and Technical Guidance Meetings.

Modelling and observations of droplet growth in clouds A Coals 1, A M Blyth 1, J-L Brenguier 2, A M Gadian 1 and W W Grabowski 3 Understanding the detailed.

JAPAN’s GV Strategy and Plans for GPM

A Combined Radar-Radiometer Approach to Estimate Rain Rate Profile and Underlying Surface Wind Speed over the Ocean Shannon Brown and Christopher Ruf University.

An Outline for Global Precipitation Mission Ground Validation: Building on Lessons Learned from TRMM Sandra Yuter and Robert Houze University of Washington.

Active and passive microwave remote sensing of precipitation at high latitudes R. Bennartz - M. Kulie - C. O’Dell (1) S. Pinori – A. Mugnai (2) (1) University.

Robin Hogan Anthony Illingworth Marion Mittermaier Ice water content from radar reflectivity factor and temperature.

Ship-Based Measurements of Cloud Microphysics and PBL Properties in Precipitating Trade Cumuli During RICO Institutions: University of Miami; University.

UNIVERSITY OF BASILICATA CNR-IMAA (Consiglio Nazionale delle Ricerche Istituto di Metodologie per l’Analisi Ambientale) Tito Scalo (PZ) Analysis and interpretation.

Developing Winter Precipitation Algorithm over Land from Satellite Microwave and C3VP Field Campaign Observations Fifth Workshop of the International Precipitation.

Observations of Specific Differential Phase, KDP Chris Collier Acknowledgements: Lindsay Bennett, Alan Blyth and David Dufton.

Chap. V Precipitation measurements

NPOL Olympex Located N/ W, 157 m ASL

Precipitation Measurements using Radar

Microwave Remote Sensing

S-Pol Radar Deployment

Dual-Aircraft Investigation of the Inner Core of Hurricane Nobert

Presentation transcript:

Dual-Polarization and Dual-Wavelength Radar Measurements Vivek National Center for Atmospheric Research Boulder, Colorado I.Polarization and dual- wavelength radar II.Cloud microphysics III. Examples of products and ka-band observations.

Dual-wavelength radar: S-Polka

Microphysics Precipitation type: Ice or liquid? Precipitation particle shape, size and concentration. Sensitivity: km 0.1 mm droplet size100 per liter

. (. ( Reflectivity ZDR Number concentration # m^-3 Shape of DSD Rain rate mm/hr Median volume Diameter, mm Spatial distribution of polarization radar measurements, retrieved DSD parameters, and rain rate

Examples of Ka-band radar Measurements

Sample Plane Parallel Indicator (PPI) Scan From WISP04, 2004.

Range Height Indicator from WISP04 S-Band Reflectivity (dBZ)Ka-Band Reflectivity (dBZ) Particle ID output Z difference (S-band – Ka-band) Dry snow Pristine Crystals Irregular crystals Ground clutter Range (km) Height (km) Side lobe artifact

Advantages of dual- wavelength system Detection of cloud droplets. Estimate of size and LWC. Raindrop size distribution. Effect of Bragg scatter is less at Ka-band. Improved cloud microphysical retrieval using both dual-wavelength and dual-polarization observations.

Knight et al. JAS, J. Atmos. Sci., 59, Data from the RHIs are fit to a Gamma distribution and characteristics of the drops are displayed here as labeled at the left at the three times for the three rows. The last row, , is an exponent in the gamma distribution. When  = 0 the distribution is exponential, and as  increases it narrows. The rainfall rate is calculated as if at the ground with zero vertical air velocity.

Issues: Measurement Number of independent samples and standard error of radar observables. Calibration of radar measurements. How to combine forward scattering observations with backscatter measurements?

Issues: Microphysics Drop shape and size distribution (DSD). Ice particle shape and density. How to separate DSD and particle shape effects in polarization measurements? How to detect super cooled droplets?