Cirrus layer microphysical properties derived from surface-based millimeter radar and infrared interferometer data

Observational data regarding the properties of cirrus clouds are needed to aid in the development of accurate, physically based parameterizations in climate models. The Atmospheric Radiation Measurement (ARM) program, sponsored by the U.S. Department of Energy, is providing continuous observations of cirrus clouds with a suite of instrumentation at several locales. In this paper, we describe an algorithm to derive the microphysical properties of optically thin cirrus clouds. This algorithm uses radar reflectivity and infrared emission spectra from an interferometer and is tailored for the specific instruments at the ARM sites. We present in situ validation of the technique and examine a cirrus case study to illustrate the sensitivity of the algorithm. In the case study, solar fluxes calculated from the retrieved microphysical parameters are compared to observed fluxes to build confidence in the algorithm results. Comparison of the retrieved quantities to microphysical parameters retrieved from satellite data is also presented.

[1]  K. Liou,et al.  Solar Radiative Transfer in Cirrus Clouds. Part I: Single-Scattering and Optical Properties of Hexagonal Ice Crystals , 1989 .

[2]  J. Curry,et al.  A parameterization of ice cloud optical properties for climate models , 1992 .

[3]  E. Westwater,et al.  User's guide to WPL microwave radiative transfer software , 1991 .

[4]  A. H. Auer,et al.  The Dimension of Ice Crystals in Natural Clouds , 1970 .

[5]  Graeme L. Stephens,et al.  Theoretical Aspects of Modeling Backscattering by Cirrus Ice Particles at Millimeter Wavelengths , 1995 .

[6]  T. Ackerman,et al.  Heating rates in tropical anvils , 1988 .

[7]  Sergey Y. Matrosov,et al.  Estimation of ice cloud parameters from ground‐based infrared radiometer and radar measurements , 1992 .

[8]  A study of composite cirrus morphology using data from a 94-GHz radar and correlations with temperature and large-scale vertical motion , 1997 .

[9]  E. Clothiaux,et al.  Uncertainties in modeled and measured clear‐sky surface shortwave irradiances , 1997 .

[10]  D. Wylie,et al.  The 27-28 October 1986 FIRE cirrus case study: Meteorology and clouds , 1990 .

[11]  Patrick Minnis,et al.  Parameterizations of reflectance and effective emittance for satellite remote sensing of cloud properties , 1998 .

[12]  K. Stamnes,et al.  Numerically stable algorithm for discrete-ordinate-method radiative transfer in multiple scattering and emitting layered media. , 1988, Applied optics.

[13]  W. Menzel,et al.  Two years of cloud cover statistics using VAS. [Visible infrared spin scan radiometer Atmospheric Sounder] , 1989 .

[14]  Steven A. Ackerman,et al.  Remote sensing cloud properties from high spectral resolution infrared observations , 1993 .

[15]  Patrick Minnis,et al.  Inference of Cirrus Cloud Properties Using Satellite-observed Visible and Infrared Radiances. Part II: Verification of Theoretical Cirrus Radiative Properties , 1993 .

[16]  Patrick Minnis,et al.  Comparison of in situ and satellite‐derived cloud properties during SUCCESS , 1998 .

[17]  L. Radke,et al.  A Summary of the Physical Properties of Cirrus Clouds , 1990 .

[18]  C. McKay,et al.  Rapid calculation of radiative heating rates and photodissociation rates in inhomogeneous multiple scattering atmospheres , 1989 .

[19]  Sergey Y. Matrosov,et al.  Radar and Radiation Properties of Ice Clouds , 1995 .

[20]  P. Francis,et al.  Improved Measurements of the Ice Water Content in Cirrus Using a Total-Water Probe , 1995 .

[21]  Patrick Minnis,et al.  Inference of cirrus cloud properties using satellite-observed visible and infrared radiances. Part I: parameterization of radiance fields , 1993 .

[22]  G. L. Stephens,et al.  The Interpretation of Remotely Sensed High Cloud Emittances , 1980 .

[23]  V. Ramaswamy,et al.  Interdependence of Radiation and Microphysics in Cirrus Clouds , 1986 .

[24]  K. Liou.  Influence of Cirrus Clouds on Weather and Climate Processes: A Global Perspective , 1986 .

[25]  Earl E. Gossard,et al.  Measurement of Cloud Droplet Size Spectra by Doppler Radar , 1994 .

[26]  An examination of cirrus cloud characteristics using data from millimeter wave radar and lidar: The 24 April SUCCESS Case Study , 1998 .

[27]  Ulrike Lohmann,et al.  Influence of cirrus cloud radiative forcing on climate and climate sensitivity in a general circulation model , 1995 .

[28]  Sergey Y. Matrosov,et al.  Retrieval of Vertical Profiles of Cirrus Cloud Microphysical Parameters from Doppler Radar and Infrared Radiometer Measurements , 1994 .

[29]  P. Minnis,et al.  Cloud and radiative fields derived from GOES‐8 during SUCCESS and the ARM‐UAV spring 1996 flight series , 1998 .

[30]  Patrick Minnis,et al.  Examination of Coupling between an Upper-Tropospheric Cloud System and Synoptic-Scale Dynamics Diagnosed from Wind Profiler and Radiosonde Data , 1995 .

[31]  S. Schwartz,et al.  The Atmospheric Radiation Measurement (ARM) Program: Programmatic Background and Design of the Cloud and Radiation Test Bed , 1994 .

[32]  Paul W. Stackhouse,et al.  The Relevance of the Microphysical and Radiative Properties of Cirrus Clouds to Climate and Climatic Feedback , 1990 .

[33]  Q. Fu,et al.  Parameterization of the Radiative Properties of Cirrus Clouds , 1993 .

[34]  Mark A. Miller,et al.  An Evaluation of a 94-GHz Radar for Remote Sensing of Cloud Properties , 1995 .

[35]  A. Berk.  MODTRAN : A moderate resolution model for LOWTRAN7 , 1989 .