A global view of horizontally oriented crystals in ice clouds from Cloud‐Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO)

We analyze optical signatures in 18 months of CALIOP layer-integrated backscatter and depolarization ratio to investigate the geographical and seasonal distribution of oriented crystals in ice clouds on a global scale. Oriented crystals are found to be rare: they appear in ~6% of all ice cloud layers, and inside these layers the proportion of oriented crystals is estimated below 5%, even though they have a significant effect on the cloud optical properties. The geographical pattern of crystal orientation is very stable over the year, without any noticeable cycle. We investigate the atmospheric conditions which might lead to crystal orientation, including synoptic-scale dynamics and thermodynamic profiles. In the tropics, detections of crystal orientation are more numerous in areas dominated by convection on a monthly basis, and at midlatitudes less numerous in areas dominated by strong horizontal winds. Synoptic effects, however, appear secondary; orientation is primarily driven by temperature. Oriented crystals are mostly nonexistent in ice clouds colder than -30°C, and very frequent in warmer ice clouds, appearing in 30% of such clouds in the tropics and up to 50% at higher latitudes. The temperatures where oriented crystals are found (-30°C to -10°C) are conducive to the formation of planar crystals. Results suggest oriented crystals are more frequent just above cloud base in slightly thicker cloud layers, which might provide clues to how and why orientation takes place. Copyright 2010 by the American Geophysical Union.

[1]  K. Gierens,et al.  Modelling of cirrus clouds – Part 1b: Structuring cirrus clouds by dynamics , 2009 .

[2]  Andrew J. Heymsfield,et al.  Parameterizations for the cross-sectional area and extinction of cirrus and stratiform ice cloud particles , 2003 .

[3]  E. O'connor,et al.  Doppler lidar measurements of oriented planar ice crystals falling from supercooled and glaciated layer clouds , 2009, 0906.0701.

[4]  Pierre H. Flamant,et al.  OBSERVATIONS OF HORIZONTALLY ORIENTED ICE CRYSTALS IN CIRRUS CLOUDS WITH POLDER-1/ADEOS-1 , 1999 .

[5]  Stephen L. Durden,et al.  Observations and Parameterizations of Particle Size Distributions in Deep Tropical Cirrus and Stratiform Precipitating Clouds: Results from In Situ Observations in TRMM Field Campaigns , 2002 .

[6]  Patrick Chervet,et al.  Solar glint from oriented crystals in cirrus clouds. , 2008, Applied optics.

[7]  Jacques Pelon,et al.  Validation of the CALIPSO-CALIOP extinction coefficients from in situ observations in midlatitude cirrus clouds during the CIRCLE-2 experiment , 2010 .

[8]  Zhaoyan Liu,et al.  The depolarization - attenuated backscatter relation: CALIPSO lidar measurements vs. theory. , 2007, Optics express.

[9]  H. Chepfer,et al.  Analysis of lidar measurements of ice clouds at multiple incidence angles , 2002 .

[10]  Patrick Minnis,et al.  Depolarization ratio and attenuated backscatter for nine cloud types: analyses based on collocated CALIPSO lidar and MODIS measurements. , 2008, Optics express.

[11]  Yoshihide Takano,et al.  Solar Radiative Transfer in Cirrus Clouds. Part II: Theory and Computation of Multiple Scattering in an Anisotropic Medium , 1989 .

[12]  H. Chepfer,et al.  Polar stratospheric clouds over Antarctica from the CALIPSO spaceborne lidar , 2008 .

[13]  M. Molina,et al.  Formation of low-temperature cirrus from H2SO4/H2O aerosol droplets. , 2006, The journal of physical chemistry. A.

[14]  J. Nelson.  Sublimation of Ice Crystals , 1998 .

[15]  Otto Schrems,et al.  A Lidar and Backscatter Sonde Measurement Campaign at Table Mountain during February–March 1997: Observations of Cirrus Clouds , 2001 .

[16]  Kenneth Sassen,et al.  A Midlatitude Cirrus Cloud Climatology from the Facility for Atmospheric Remote Sensing. Part II: Microphysical Properties Derived from Lidar Depolarization , 2001 .

[17]  Martial Haeffelin,et al.  Classification of Ice Crystal Shapes in Midlatitude Ice Clouds from Three Years of Lidar Observations over the SIRTA Observatory , 2006 .

[18]  Barbara E. Carlson,et al.  T‐Matrix computations of zenith‐enhanced lidar backscatter from horizontally oriented ice plates , 1997 .

[19]  Catherine Prigent,et al.  Relations of polarized scattering signatures observed by the TRMM Microwave Instrument with electrical processes in cloud systems , 2005 .

[20]  J. Klett,et al.  Microphysics of Clouds and Precipitation , 1978, Nature.

[21]  Bryan A. Baum,et al.  Enhanced lidar backscattering by quasi-horizontally oriented ice crystal plates in cirrus clouds , 2003 .

[22]  J. Klett.  Orientation Model for Particles in Turbulence , 1995 .

[23]  K. Krüger,et al.  Cirrus, contrails, and ice supersaturated regions in high pressure systems at northern mid latitudes , 2007 .

[24]  J. Iaquinta,et al.  Cirrus Crystal Terminal Velocities , 2000 .

[25]  Vincent Noel,et al.  Study of Ice Crystal Orientation in Cirrus Clouds Based on Satellite Polarized Radiance Measurements , 2004 .

[26]  C. Westbrook.  (www.interscience.wiley.com) DOI: 10.1002/qj.000 The fall speeds of sub-100µm ice crystals , 2022 .

[27]  Merritt N. Deeter,et al.  Modeling of Submillimeter Passive Remote Sensing of Cirrus Clouds , 1998 .

[28]  Kenneth Sassen,et al.  Remote Sensing of Planar Ice Crystal Fall Attitudes , 1980 .

[29]  K. Sassen,et al.  Parry arc: a polarization lidar, ray-tracing, and aircraft case study. , 2000, Applied optics.

[30]  Bryan A. Baum,et al.  Identification of cloud phase from PICASSO-CENA lidar depolarization: a multiple scattering sensitivity study , 2001 .

[31]  A. Simmons,et al.  The ECMWF operational implementation of four‐dimensional variational assimilation. I: Experimental results with simplified physics , 2007 .

[32]  David M. Winker,et al.  Fully automated analysis of space-based lidar data: an overview of the CALIPSO retrieval algorithms and data products , 2004, SPIE Remote Sensing.

[33]  CALIPSO observations of wave-induced PSCs with near-unity optical depth over Antarctica in 2006-2007 , 2009, 0912.1481.

[34]  Zhaoyan Liu,et al.  CALIOP Algorithm Theoretical Basis Document Part 3 : Scene Classification Algorithms , 2005 .

[35]  D. Winker,et al.  Initial performance assessment of CALIOP , 2007 .

[36]  Andrew J. Heymsfield,et al.  A Balloon-Borne Continuous Cloud Particle Replicator for Measuring Vertical Profiles of Cloud Microphysical Properties: Instrument Design, Performance, and Collection Efficiency Analysis , 1997 .

[37]  M. Pitts,et al.  Characterization of Polar Stratospheric Clouds with spaceborne lidar: CALIPSO and the 2006 Antarctic season , 2007 .

[38]  N. L. Abshire,et al.  Some Microphysical Properties of an Ice Cloud from Lidar Observation of Horizontally Oriented Crystals , 1978 .

[39]  Vincent Noel,et al.  Study of Planar Ice Crystal Orientations in Ice Clouds from Scanning Polarization Lidar Observations , 2005 .

[40]  Kenneth Sassen,et al.  Diurnal effects in the composition of cirrus clouds , 2003 .

[41]  Kazuhiko Masuda,et al.  Influence of particle orientation on retrieving cirrus cloud properties by use of total and polarized reflectances from satellite measurements , 2004 .

[42]  N. Fukuta,et al.  The Growth of Atmospheric Ice Crystals: A Summary of Findings in Vertical Supercooled Cloud Tunnel Studies , 1999 .

[43]  S. Bony,et al.  Marine boundary layer clouds at the heart of tropical cloud feedback uncertainties in climate models , 2005 .

[44]  A B Fraser,et al.  Subsuns, Bottlinger's rings, and elliptical halos. , 1994, Applied optics.

[45]  Robin J. Hogan,et al.  Estimate of the global distribution of stratiform supercooled liquid water clouds using the LITE lidar , 2004 .

[46]  D. P. Wareing,et al.  Lidar observations of the horizontal orientation of ice crystals in cirrus clouds , 1990 .

[47]  Berengere Dubrulle,et al.  Horizontally Oriented Plates in Clouds , 2004 .

[48]  K. Stamnes,et al.  CALIPSO/CALIOP Cloud Phase Discrimination Algorithm , 2009 .

[49]  J. Gayet,et al.  On the distribution of relative humidity in cirrus clouds , 2004 .