Evaluating Light Rain Drop Size Estimates from Multiwavelength Micropulse Lidar Network Profiling

AbstractThis paper investigates multiwavelength retrievals of median equivolumetric drop diameter D0 suitable for drizzle and light rain, through collocated 355-/527-nm Micropulse Lidar Network (MPLNET) observations collected during precipitation occurring 9 May 2012 at the Goddard Space Flight Center (GSFC) project site. By applying a previously developed retrieval technique for infrared bands, the method exploits the differential backscatter by liquid water at 355 and 527 nm for water drops larger than ≈50 μm. In the absence of molecular and aerosol scattering and neglecting any transmission losses, the ratio of the backscattering profiles at the two wavelengths (355 and 527 nm), measured from light rain below the cloud melting layer, can be described as a color ratio, which is directly related to D0. The uncertainty associated with this method is related to the unknown shape of the drop size spectrum and to the measurement error. Molecular and aerosol scattering contributions and relative transmission ...

[1]  P. Kollias,et al.  Lidar and Triple-Wavelength Doppler Radar Measurements of the Melting Layer: A Revised Model for Dark- and Brightband Phenomena , 2005 .

[2]  G. Peters,et al.  Lidar and radar measurements of the melting layer: observations of dark and bright band phenomena , 2012 .

[3]  Glaciation of a mixed-phase boundary layer cloud at a coastal arctic site as depicted in continuous lidar measurements , 2008 .

[4]  Robin J. Hogan,et al.  Retrieving Stratocumulus Drizzle Parameters Using Doppler Radar and Lidar , 2005 .

[5]  M. McCormick,et al.  Methodology for error analysis and simulation of lidar aerosol measurements. , 1979, Applied optics.

[6]  NOTES AND CORRESPONDENCE Micropulse Lidar Signals: Uncertainty Analysis , 2002 .

[7]  Brent N. Holben,et al.  Lidar Observations of Tropospheric Aerosols Over Northeastern South Africa During the Arrex and Safari-2000 Dry Season Experiments , 2003 .

[8]  Ellsworth J. Welton,et al.  Elevated Cloud and Aerosol Layer Retrievals from Micropulse Lidar Signal Profiles , 2008 .

[9]  David D. Turner,et al.  Full-Time, Eye-Safe Cloud and Aerosol Lidar Observation at Atmospheric Radiation Measurement Program Sites: Instruments and Data Analysis , 2013 .

[10]  James D. Spinhirne,et al.  Micro pulse lidar , 1993, IEEE Trans. Geosci. Remote. Sens..

[11]  Sebastian Wolf,et al.  Mie scattering by ensembles of particles with very large size parameters , 2004, Comput. Phys. Commun..

[12]  F. G. Fernald Analysis of atmospheric lidar observations: some comments. , 1984, Applied optics.

[13]  Robin J. Hogan,et al.  Estimating drizzle drop size and precipitation rate using two-colour lidar measurements , 2010 .

[14]  A. Slingo,et al.  Response of the National Center for Atmospheric Research community climate model to improvements in the representation of clouds , 1991 .

[15]  Ellsworth J. Welton,et al.  Global monitoring of clouds and aerosols using a network of micropulse lidar systems , 2001, SPIE Asia-Pacific Remote Sensing.

[16]  Z. Kam,et al.  Absorption and Scattering of Light by Small Particles , 1998 .

[17]  Ellsworth J. Welton,et al.  Measurements of aerosol vertical profiles and optical properties during INDOEX 1999 using micropulse lidars , 2002 .

[18]  E. Welton,et al.  Micro-Pulse Lidar Signals: Uncertainty Analysis , 2013 .

[19]  K. Beard Terminal Velocity and Shape of Cloud and Precipitation Drops Aloft , 1976 .

[20]  P. T. Willis,et al.  Functional fits to some observed drop size distributions and parameterization of rain , 1984 .

[21]  S. Matrosov,et al.  CloudSat spaceborne 94 GHz radar bright bands in the melting layer: An attenuation‐driven upside‐down lidar analog , 2007 .

[22]  W. Steen Absorption and Scattering of Light by Small Particles , 1999 .

[23]  C. Fairall,et al.  Measurement of Stratus Cloud and Drizzle Parameters in ASTEX with a K , 1995 .

[24]  David K. Lynch,et al.  Color and Light in Nature, Second Edition , 2001 .

[25]  B. Barkstrom,et al.  Seasonal variation of cloud radiative forcing derived from the Earth Radiation Budget Experiment , 1990 .

[26]  K Sassen Backscattering cross sections for hydrometeors: measurements at 6328 A. , 1978, Applied optics.

[27]  L. Sauvage,et al.  EZ Lidar: A new compact autonomous eye-safe scanning aerosol Lidar for extinction measurements and PBL height detection. Validation of the performances against other instruments and intercomparison campaigns , 2011 .

[28]  K. Steffen,et al.  July 2012 Greenland melt extent enhanced by low-level liquid clouds , 2013, Nature.

[29]  James D. Spinhirne,et al.  Compact Eye Safe Lidar Systems , 1995 .

[30]  Chuntao Liu,et al.  Rain characteristics and large‐scale environments of precipitation objects with extreme rain volumes from TRMM observations , 2013 .

[31]  Kenneth Sassen,et al.  Subvisual-Thin Cirrus Lidar Dataset for Satellite Verification and Climatological Research , 1992 .

[32]  E. O'connor,et al.  A Technique for Autocalibration of Cloud Lidar , 2004 .