AUTHOR=Chemyakin Eduard , Stamnes Snorre , Burton Sharon P. , Liu Xu , Hostetler Chris , Ferrare Richard , Cairns Brian , Dubovik Oleg 

TITLE=Improved Lorenz-Mie Look-Up Table for Lidar and Polarimeter Retrievals

JOURNAL=Frontiers in Remote Sensing

VOLUME=2

YEAR=2021

URL=https://www.frontiersin.org/journals/remote-sensing/articles/10.3389/frsen.2021.711106

DOI=10.3389/frsen.2021.711106

ISSN=2673-6187

ABSTRACT=<p>Lidar and polarimeter aerosol microphysical retrievals require calculating single-scattering properties that are computationally expensive. One of the easiest ways to speed up these calculations is to use a look-up table. Two important currently available look-up tables were created about 15 years ago. Advancements in modern computational hardware allows us to create a new look-up table with improved precision over a larger range of aerosol properties. In this new and improved Lorenz-Mie look-up table we tabulate the light scattering by an ensemble of homogeneous isotropic spheres at arbitrary wavelengths starting from <inline-formula id="inf1"><mml:math id="m1" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>0.355</mml:mn><mml:mtext> </mml:mtext><mml:mi mathvariant="italic">μ</mml:mi><mml:mtext>m</mml:mtext></mml:mrow></mml:math></inline-formula>. The improved look-up table covers spherical atmospheric aerosols with radii in the range of 0.001–<inline-formula id="inf2"><mml:math id="m2" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>100</mml:mn><mml:mtext> </mml:mtext><mml:mi mathvariant="italic">μ</mml:mi><mml:mtext>m</mml:mtext></mml:mrow></mml:math></inline-formula>, with real parts of the complex refractive index in the range of 1.29–1.65, and with imaginary parts of the complex refractive index in the range of 0–0.05. We test twelve wavelengths from 0.355 to <inline-formula id="inf3"><mml:math id="m3" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>2.264</mml:mn><mml:mtext> </mml:mtext><mml:mi mathvariant="italic">μ</mml:mi><mml:mtext>m</mml:mtext></mml:mrow></mml:math></inline-formula> and find that the elements of the normalized scattering matrix as well as the asymmetry parameter, the aerosol absorption, backscatter, extinction, and scattering coefficients are precise to within <inline-formula id="inf4"><mml:math id="m4" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>1</mml:mn><mml:mtext>%</mml:mtext></mml:mrow></mml:math></inline-formula> for <inline-formula id="inf5"><mml:math id="m5" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>99.99</mml:mn><mml:mtext>%</mml:mtext></mml:mrow></mml:math></inline-formula> of cases. The look-up table together with C++, Fortran, Matlab, and Python codes are freely available online.</p>