Dual-field-of-view Raman lidar measurements for the retrieval of cloud microphysical properties.

Dual-field-of-view Raman lidar measurements, detecting Raman-scattered light with two fields of view simultaneously, are used for the first time to retrieve cloud microphysical properties. The measurements are performed with the Multiwavelength Atmospheric Raman Lidar for Temperature, Humidity, and Aerosol Profiling (MARTHA) at the Leibniz Institute for Tropospheric Research in Leipzig, Germany. Light that is scattered in forward direction by cloud droplets and inelastically backscattered by N2 molecules is detected. A forward iterative algorithm uses the measured signals to derive profiles of the effective cloud droplet radius, extinction coefficient, and liquid-water content of the investigated clouds. The setup, algorithm, error analysis, and a measurement example are presented. The obtained liquid-water path is validated by observations with a microwave radiometer. With the capability to retrieve aerosol properties as well as cloud microphysical properties, the Raman lidar MARTHA is an ideal tool for studies of the aerosol indirect effect.

[1]  A. Ansmann,et al.  Independent measurement of extinction and backscatter profiles in cirrus clouds by using a combined Raman elastic-backscatter lidar. , 1992, Applied optics.

[2]  A. Ansmann,et al.  Experimental determination of the lidar overlap profile with Raman lidar. , 2002, Applied optics.

[3]  H. L. Miller,et al.  Climate Change 2007: The Physical Science Basis , 2007 .

[4]  Laurent Poutier,et al.  Multiple-scattering lidar retrieval method: tests on Monte Carlo simulations and comparisons with in situ measurements. , 2002, Applied optics.

[5]  O. Boucher,et al.  Satellite-based estimate of the direct and indirect aerosol climate forcing , 2008 .

[6]  S. Twomey.  The Influence of Pollution on the Shortwave Albedo of Clouds , 1977 .

[7]  U. Wandinger,et al.  Multiple-Scattering Influence on Extinction-and Backscatter-Coefficient Measurements with Raman and High-Spectral-Resolution Lidars. , 1998, Applied optics.

[8]  J. Penner,et al.  Investigation of the first and second aerosol indirect effects using data from the May 2003 Intensive Operational Period at the Southern Great Plains , 2007 .

[9]  Raymond N. Wilson.  Reflecting Telescope Optics I , 1996 .

[10]  G. Feingold,et al.  The scale problem in quantifying aerosol indirect effects , 2011 .

[11]  L R Bissonnette,et al.  Multiply scattered aerosol lidar returns: inversion method and comparison with in situ measurements. , 1995, Applied optics.

[12]  Gilles Roy,et al.  Information content of data measured with a multiple-field-of-view lidar. , 2006, Applied optics.

[13]  Eleonora P Zege,et al.  Analytical modeling of Raman lidar return, including multiple scattering. , 2003, Applied optics.

[14]  A. Ansmann,et al.  Measurement of atmospheric aerosol extinction profiles with a Raman lidar. , 1990, Optics letters.

[15]  Detlef Müller,et al.  Vertical profiles of microphysical particle properties derived from inversion with two-dimensional regularization of multiwavelength Raman lidar data: experiment. , 2011, Applied optics.

[16]  Raymond N. Wilson,et al.  Reflecting Telescope Optics II , 1999 .

[17]  J. Klett.  Stable analytical inversion solution for processing lidar returns. , 1981, Applied optics.

[18]  Giovanni Martucci,et al.  Ground-based retrieval of continental and marine warm cloud microphysics , 2011 .

[19]  E. Zege,et al.  Possibilities of warm cloud microstructure profiling with multiple-field-of-view Raman lidar. , 2007, Applied optics.

[20]  F. Bréon,et al.  Aerosol Effect on Cloud Droplet Size Monitored from Satellite , 2002, Science.

[21]  J. Seinfeld,et al.  Aerosol-cloud relationships in continental shallow cumulus , 2008 .

[22]  Albert Ansmann,et al.  Relative-humidity profiling in the troposphere with a Raman lidar. , 2002, Applied optics.

[23]  Albert Ansmann,et al.  Daytime operation of a pure rotational Raman lidar by use of a Fabry-Perot interferometer. , 2005, Applied optics.

[24]  E. Clothiaux,et al.  Cloud Droplet Size Distributions in Low-Level Stratiform Clouds , 2000 .

[25]  Ina Mattis,et al.  RAMSES: German Meteorological Service autonomous Raman lidar for water vapor, temperature, aerosol, and cloud measurements. , 2012, Applied optics.

[26]  Albert Ansmann,et al.  Ash and fine-mode particle mass profiles from EARLINET-AERONET observations over central Europe after the eruptions of the Eyjafjallajökull volcano in 2010 , 2011 .

[27]  G. Feingold,et al.  Quantifying error in the radiative forcing of the first aerosol indirect effect , 2008 .

[28]  Gilles Roy,et al.  Multiple-scattering-based lidar retrieval: method and results of cloud probings. , 2005, Applied optics.

[29]  Kengo Iokibe,et al.  Ground‐based network observation of Asian dust events of April 1998 in east Asia , 2001 .

[30]  Albert Ansmann,et al.  Air mass modification over Europe: EARLINET aerosol observations from Wales to Belarus , 2004 .

[31]  Zhaoyan Liu,et al.  Simple relation between lidar multiple scattering and depolarization for water clouds. , 2006, Optics letters.

[32]  Nicolas Gaussiat,et al.  Accurate Liquid Water Path Retrieval from Low-Cost Microwave Radiometers Using Additional Information from a Lidar Ceilometer and Operational Forecast Models , 2007 .

[33]  Y. Sasano,et al.  Light scattering characteristics of various aerosol types derived from multiple wavelength lidar observations. , 1989, Applied optics.

[34]  Jacques Pelon,et al.  An overview of the ACE2 CLOUDYCOLUMN closure experiment , 2000 .