skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Retrievals of Riming and Snow Density From Vertically Pointing Doppler Radars

Journal Article · · Journal of Geophysical Research: Atmospheres
DOI:https://doi.org/10.1029/2018jd028603· OSTI ID:1611644
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [5]
  1. Univ. of Reading, Reading (United Kingdom). National Centre for Earth Observation
  2. Colorado State Univ., Fort Collins, CO (United States)
  3. Univ. of Reading, Reading (United Kingdom); European Centre for Medium-Range Weather Forecasts, Reading (United Kingdom)
  4. Univ. of Helsinki (Finland). Inst. for Atmospheric and Earth System Research/Physics; Finnish Meteorological Inst., Helsinki (Finland)
  5. Univ. of Cologne (Germany). Inst. of Geophysics and Meteorology

Abstract Retrievals of ice and snow are made from Ka‐ and W‐band zenith‐pointing Doppler radars at Hyytiälä, Finland, during the snow experiment component of the Biogenic Aerosols: Effects on Clouds and Climate (2014) field campaign. In a novel optimal estimation retrieval, mean Doppler velocity is exploited to retrieve a density factor parameter, which modulates the mass, shape, terminal velocity, and backscatter cross sections of ice particles. In a case study including aggregate snow and graupel we find that snow rate and ensemble mean ice density can be retrieved to within 50% of in situ measurements at the surface using dual‐frequency Doppler radar retrievals. While Doppler measurements are essential to the retrieval of particle density, the dual‐frequency ratio provides a strong constraint on particle size. The retrieved density factor is strongly correlated with liquid water path, indicating that riming is the primary process by which the density factor is modulated. Using liquid water path as a proxy for riming, profiles classified as unrimed snow, rimed snow, and graupel exhibit distinct features characteristic of aggregation and riming processes, suggesting the potential to make estimates of process rates from these retrievals. We discuss the potential application of the technique to future satellite missions.

Research Organization:
Univ. of Reading, Reading (United Kingdom)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); National Centre for Earth Observation (NCEO); European Space Agency; European Union (EU); Academy of Finland; German Science Foundation (DFG)
Grant/Contract Number:
SC0011666; 4000112030/15/NL/CT; 689443; 307331; 305175; KN 1112/2-1
OSTI ID:
1611644
Alternate ID(s):
OSTI ID: 1786845
Journal Information:
Journal of Geophysical Research: Atmospheres, Vol. 123, Issue 24; ISSN 2169-897X
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 48 works
Citation information provided by
Web of Science

References (95)

Characteristics of mixed-phase clouds. I: Lidar, radar and aircraft observations from CLARE'98 journal July 2003
Uncertainty Analysis for CloudSat Snowfall Retrievals journal February 2011
Comparison of snowfall estimates from the NASA CloudSat Cloud Profiling Radar and NOAA/NSSL Multi-Radar Multi-Sensor System journal October 2016
Equation for the Microwave Backscatter Cross Section of Aggregate Snowflakes Using the Self-Similar Rayleigh–Gans Approximation journal September 2014
Using Ice Clouds for Mitigating the EarthCARE Doppler Radar Mispointing journal April 2015
Improved Measurements of the Ice Water Content in Cirrus Using a Total-Water Probe journal April 1995
Ubiquitous low‐level liquid‐containing Arctic clouds: New observations and climate model constraints from CALIPSO‐GOCCP journal October 2012
Parameterization of Cloud Microphysics Based on the Prediction of Bulk Ice Particle Properties. Part I: Scheme Description and Idealized Tests journal January 2015
Quantifying the effect of riming on snowfall using ground-based observations: THE EFFECT OF RIMING ON SNOWFALL journal April 2017
Growth of ice particle mass and projected area during riming journal January 2017
Statistical properties of the normalized ice particle size distribution journal January 2005
Next-generation spaceborne Cloud Profiling Radars conference May 2009
Inverse Methods for Atmospheric Sounding: Theory and Practice book July 2000
Fractal geometry of aggregate snowflakes revealed by triple-wavelength radar measurements journal January 2015
Utilizing Spaceborne Radars to Retrieve Dry Snowfall journal December 2009
A New Bulk Microphysical Scheme That Includes Riming Intensity and Temperature-Dependent Ice Characteristics journal March 2011
THE CLOUDSAT MISSION AND THE A-TRAIN: A New Dimension of Space-Based Observations of Clouds and Precipitation journal December 2002
Use of Mass- and Area-Dimensional Power Laws for Determining Precipitation Particle Terminal Velocities journal June 1996
Refinements in the Treatment of Ice Particle Terminal Velocities, Highlighting Aggregates journal May 2005
A Variational Scheme for Retrieving Rainfall Rate and Hail Reflectivity Fraction from Polarization Radar journal October 2007
The Dimensional Characteristics of Ice Crystal Aggregates from Fractal Geometry journal May 2010
Fingerprints of a riming event on cloud radar Doppler spectra: observations and modeling journal January 2016
A Multisensor Approach Toward a Better Understanding of Snowfall Microphysics: The TOSCA Project journal May 2011
The Potential of Spaceborne Dual-Wavelength Radar to Make Global Measurements of Cirrus Clouds journal May 1999
Combined CloudSat-CALIPSO-MODIS retrievals of the properties of ice clouds journal January 2010
Improved rain rate and drop size retrievals from airborne Doppler radar journal January 2017
Importance of snow to global precipitation: IMPORTANCE OF SNOW TO PRECIPITATION journal November 2015
Parametrization of ice-particle size distributions for mid-latitude stratiform cloud journal July 2005
Summer Snowfall Workshop: Scattering Properties of Realistic Frozen Hydrometeors from Simulations and Observations, as well as Defining a New Standard for Scattering Databases journal March 2018
The Atmospheric radiation measurement (ARM) program network of microwave radiometers: instrumentation, data, and retrievals journal January 2013
What Can We Conclude about the Real Aspect Ratios of Ice Particle Aggregates from Two-Dimensional Images? journal March 2017
Improved Retrieval of Cloud Liquid Water from CloudSat and MODIS journal August 2016
An improved method for determining the degree of snow crystal riming by vertical Doppler radar journal August 1995
Observation of snowfall with a low-power FM-CW K-band radar (Micro Rain Radar) journal May 2011
Observed differences of triple-frequency radar signatures between snowflakes in stratiform and convective clouds journal May 2017
The Concept of “Normalized” Distribution to Describe Raindrop Spectra: A Tool for Cloud Physics and Cloud Remote Sensing journal June 2001
Deriving Mixed-Phase Cloud Properties from Doppler Radar Spectra journal April 2004
Potential of Higher-Order Moments and Slopes of the Radar Doppler Spectrum for Retrieving Microphysical and Kinematic Properties of Arctic Ice Clouds journal February 2017
Toward Improving Ice Water Content and Snow-Rate Retrievals from Radars. Part I: X and W Bands, Emphasizing CloudSat journal September 2016
How Does Riming Affect Dual-Polarization Radar Observations and Snowflake Shape? journal June 2018
Cloudnet: Continuous Evaluation of Cloud Profiles in Seven Operational Models Using Ground-Based Observations journal June 2007
Rainfall retrieval over the ocean with spaceborne W-band radar journal January 2009
Evaluation of the GPM-DPR snowfall detection capability: Comparison with CloudSat-CPR journal November 2017
Deriving snow cloud characteristics from CloudSat observations journal January 2008
Snow Studies. Part III: Theoretical Derivations for the Ensemble Retrieval of Snow Microphysics from Dual-Wavelength Vertically Pointing Radars journal March 2014
Fast Lidar and Radar Multiple-Scattering Models. Part I: Small-Angle Scattering Using the Photon Variance–Covariance Method journal December 2008
A variational scheme for retrieving ice cloud properties from combined radar, lidar, and infrared radiometer journal January 2008
On Snow Particles Comprising an Aggregate journal August 1985
What do triple-frequency radar signatures reveal about aggregate snowflakes? journal January 2015
A Comparative Study of the Rates of Development of Potential Graupel and Hail Embryos in High Plains Storms journal December 1982
Radar signatures of snowflake riming: A modeling study: SNOWFLAKE RIMING AND RADAR journal August 2015
The GPM Combined Algorithm journal October 2016
DOMUS: DOppler MUltiple-Scattering Simulator journal January 2011
Ensemble mean density and its connection to other microphysical properties of falling snow as observed in Southern Finland journal January 2016
From CloudSat-CALIPSO to EarthCare: Evolution of the DARDAR cloud classification and its comparison to airborne radar-lidar observations: EVOLUTION OF DARDAR CLASSIFICATION journal July 2013
The Python ARM Radar Toolkit (Py-ART), a Library for Working with Weather Radar Data in the Python Programming Language journal July 2016
Radar Scattering from Ice Aggregates Using the Horizontally Aligned Oblate Spheroid Approximation journal March 2012
Microphysical Properties of Snow and Their Link to Z e S Relations during BAECC 2014 journal June 2017
Fast Reverse-Mode Automatic Differentiation using Expression Templates in C++ journal June 2014
How much snow falls on the Antarctic ice sheet? journal January 2014
Parameterization of Riming Intensity and Its Impact on Ice Fall Speed Using ARM Data journal March 2011
Observational constraints on mixed-phase clouds imply higher climate sensitivity journal April 2016
Snow Studies. Part IV: Ensemble Retrieval of Snow Microphysics from Dual-Wavelength Vertically Pointing Radars journal March 2014
Normalized particle size distribution for remote sensing application journal April 2014
Polarimetric radar and in situ observations of riming and snowfall microphysics during CLACE 2014 journal January 2015
Estimate of the global distribution of stratiform supercooled liquid water clouds using the LITE lidar: SUPERCOOLED CLOUDS DETECTED BY LITE journal March 2004
Developing and Evaluating Ice Cloud Parameterizations for Forward Modeling of Radar Moments Using in situ Aircraft Observations journal May 2015
The terminal velocity of snowflakes journal April 1954
An Improved Approach to Calculating Terminal Velocities of Plate-like Crystals and Graupel journal April 1987
A Shallow Cumuliform Snowfall Census Using Spaceborne Radar journal April 2016
Theory of growth by differential sedimentation, with application to snowflake formation journal August 2004
The retrieval of cirrus cloud properties from aircraft multi-spectral reflectance measurements during EUCREX'93 journal April 1998
An updated model for millimeter wave propagation in moist air journal September 1985
Improved Representation of Ice Particle Masses Based on Observations in Natural Clouds journal October 2010
The EarthCARE Satellite: The Next Step Forward in Global Measurements of Clouds, Aerosols, Precipitation, and Radiation journal August 2015
Mass-Dimensional Relationships for Ice Particles and the Influence of Riming on Snowfall Rates journal February 1990
Evaluation of EarthCARE Cloud Profiling Radar Doppler Velocity Measurements in Particle Sedimentation Regimes journal February 2014
Fall Patterns and Fall Velocities of Rimed Ice Crystals journal October 1972
The Global Precipitation Measurement Mission journal May 2014
Parameterization of Cloud Microphysics Based on the Prediction of Bulk Ice Particle Properties. Part II: Case Study Comparisons with Observations and Other Schemes journal January 2015
Observed relations between snowfall microphysics and triple-frequency radar measurements: TRIPLE-FREQUENCY SIGNATURES OF SNOWFALL journal June 2015
The Need to Represent Raindrop Size Spectra as Normalized Gamma Distributions for the Interpretation of Polarization Radar Observations journal March 2002
Snow Size Distribution Parameterization for Midlatitude and Tropical Ice Clouds journal December 2007
Calculating the millimetre-wave scattering phase function of snowflakes using the self-similar Rayleigh-Gans Approximation: Millimetre-Wave Phase Function of Snowflakes
  • Hogan, Robin J.; Honeyager, Ryan; Tyynelä, Jani
  • Quarterly Journal of the Royal Meteorological Society, Vol. 143, Issue 703 https://doi.org/10.1002/qj.2968
journal January 2017
Presenting the Snowflake Video Imager (SVI) journal February 2009
Diagnosing Cloud Microphysical Process Information from Remote Sensing Measurements—A Feasibility Study Using Aircraft Data. Part I: Tropical Anvils Measured during TC4 journal March 2017
Fall Velocities of Hydrometeors in the Atmosphere: Refinements to a Continuous Analytical Power Law journal December 2005
Advances in the Estimation of Ice Particle Fall Speeds Using Laboratory and Field Measurements journal August 2010
Snow scattering signals in ground-based passive microwave radiometer measurements journal January 2010
BAECC: A Field Campaign to Elucidate the Impact of Biogenic Aerosols on Clouds and Climate journal October 2016
The retrieval of cirrus cloud properties from aircraft multi-spectral reflectance measurements during EUCREX'93 journal April 1998
How much snow falls on the Antarctic ice sheet? journal January 2014
The terminal velocity of snowflakes journal October 1954
Polarimetric radar and in situ observations of riming and snowfall microphysics during CLACE 2014 text January 2015
A theory of growth by differential sedimentation with application to snowflake formation text January 2003

Cited By (2)

Development and validation of a supervised machine learning radar Doppler spectra peak-finding algorithm journal January 2019
The importance of particle size distribution and internal structure for triple-frequency radar retrievals of the morphology of snow journal January 2019