Microwave Properties of Ice-Phase Hydrometeors for Radar and Radiometers: Sensitivity to Model Assumptions

  title={Microwave Properties of Ice-Phase Hydrometeors for Radar and Radiometers: Sensitivity to Model Assumptions},
  author={Benjamin T. Johnson and Grant W. Petty and Gail M. Skofronick-Jackson},
  journal={Journal of Applied Meteorology and Climatology},
A simplified framework is presented for assessing the qualitative sensitivities of computed microwave properties, satellite brightness temperatures, and radar reflectivities to assumptions concerning the physical properties of ice-phase hydrometeors. Properties considered included the shape parameterm of a gamma size distribution and the melted-equivalent mass median diameter D0, the particle density, the dielectric mixing formula, and the choice of complex index of refraction for ice. These… 

On the microwave optical properties of randomly oriented ice hydrometeors

Abstract. Microwave remote sensing is important for observing the mass of ice hydrometeors. One of the main error sources of microwave ice mass retrievals is that approximations around the shape of

Microwave signatures of ice hydrometeors from ground-based observations above Summit, Greenland

Abstract. Multi-instrument, ground-based measurements provide unique and comprehensive data sets of the atmosphere for a specific location over long periods of time and resulting data compliment past

The microwave properties of simulated melting precipitation particles: sensitivity to initial melting.

A simplified approach is presented for assessing the microwave response to the initial melting of realistically-shaped ice particles. This paper is divided into two parts: (1) a description of the

A polarimetric scattering database for non-spherical ice particles at microwave wavelengths

Abstract. The atmospheric science community has entered a period in which electromagnetic scattering properties at microwave frequencies of realistically constructed ice particles are necessary for

Improved scattering radiative transfer for frozen hydrometeors at microwave frequencies

Abstract. To simulate passive microwave radiances in all-sky conditions requires better knowledge of the scattering properties of frozen hydrometeors. Typically, snow particles are represented as

Characterization of hydrometeors in Sahelian convective systems with an X-band radar and comparison with in situ measurements. Part II : a simple brightband method to infer the density of icy hydrometeors

AbstractA simple scheme that is based on the shape and intensity of the radar bright band is used to infer the density of hydrometeors just above the freezing level in Sahelian mesoscale convective

Soft model approximation of microwave scattering properties of ice particles

Clouds consisting of ice particles have a crucial role in our climate system and profoundly influ- ence the Earth’s radiation. However, these clouds are poorly constrained in climate models mainly

G band atmospheric radars: new frontiers in cloud physics

Abstract. Clouds and associated precipitation are the largest source of uncertainty in current weather and future climate simulations. Observations of the microphysical, dynamical and radiative

Characterizing the Radar Backscatter-Cross-Section Sensitivities of Ice-Phase Hydrometeor Size Distributions via a Simple Scaling of the Clausius–Mossotti Factor

Oneofthechallengesthatlimittheamountofinformationthatcanbeinferredfromradarmeasurementsof ice and mixed-phase precipitating clouds is the variability in ice mass within hydrometeors. The variable

Interpretation of the Precipitation Structure Contained in Polarimetric Radio Occultation Profiles Using Passive Microwave Satellite Observations

Observationally, a major source of uncertainty in evaluation of climate models arises from the difficulty in obtaining globally distributed, fine scale profiles of temperature, pressure and water



Scattering of Ice Particles at Microwave Frequencies: A Physically Based Parameterization

Abstract This paper presents a new, purely physical approach to simulate ice-particle scattering at microwave frequencies. Temperature-dependent ice particle size distributions measured by aircraft

Nonspherical and spherical characterization of ice in Hurricane Erin for wideband passive microwave comparisons

[1] In order to better understand the characteristics and physical-to-radiative relationships of frozen hydrometeors in hurricane systems, computed brightness temperatures (TB) from 10.7 to 183 ± 10

Microwave single-scattering properties of randomly oriented soft-ice hydrometeors

Abstract. Large ice hydrometeors are usually present in intense convective clouds and may significantly affect the upwelling radiances that are measured by satellite-borne microwave radiometers –

Radar backscattering properties of nonspherical ice crystals at 94 GHz

[1] The millimeter wavelength radar backscattering properties at 94 GHz for six nonspherical ice crystals, which include hexagonal column, hollow, plate, bullet rosette, aggregate, and droxtal with

Retrieval of Ice Cloud Parameters Using the Advanced Microwave Sounding Unit

Abstract An algorithm is developed to derive cloud ice water path (IWP) and ice particle effective diameters De from the advanced microwave sounding unit (AMSU) measurements. In the algorithm, both

Parameterization of scattering and absorption properties of nonspherical ice crystals at microwave frequencies

[1] The single-scattering properties of ice crystals are fundamental to the radiative transfer in ice clouds, which thereby are the basis for estimating the optical and microphysical properties of

A database of microwave single-scattering properties for nonspherical ice particles

As satellite observations at high microwave frequencies have recently become available, there is an increasing demand for methods that accurately evaluate the single-scattering properties of

Improved Radar Ice Water Content Retrieval Algorithms Using Coincident Microphysical and Radar Measurements

Airborne radar reflectivity measurements at frequencies of 9.6 and 94 GHz, with collocated, in situ particle size distribution and ice water content measurements from the Cirrus Regional Study of

A physical model to estimate snowfall over land using AMSU‐B observations

[1] In this study, we present a physical model to retrieve snowfall rate over land using brightness temperature observations from NOAA's Advanced Microwave Sounder Unit-B (AMSU-B) at 89 GHz, 150 GHz,

A simplified scheme for obtaining precipitation and vertical hydrometeor profiles from passive microwave sensors

In this study, the authors show that good results may be obtained by weighting profiles from the prior probability density function according to their deviation from the observed brightness temperatures, and present a computationally simple technique for retrieving the precipitation and vertical hydrometeor profiles from downward viewing radiometers.