Download SCATDB

SCATDB
is a lookup table of  scattering properties - scattering cross section, absorption cross section, asymmetry parameter, phase function - for randomly orientated ice particles of the following shapes: columns, plates, rosettes, dendrites, sectors and recently added aggregates. These properties are computed by Discrete Dipole Approximation. The references of the lookup table are

for crystal type particles,
  • Liu, G., 2008: A database of microwave single-scattering properties for nonspherical ice particles. Bull. Am. Met. Soc., 89, 1563-1570. 

  • and for aggregates,
  • Nowell, H., G. Liu, and R. Honeyager (2013), Modeling the microwave single-scattering properties of aggregate snowflakes, J. Geophys. Res. Atmos., 118, 7873-7885, doi:10.1002/jgrd.50620. 


  • COMBINED SCATTERING DATABASE (columns, plates, rosettes, dendrites, sectors, and aggregates) [November 2016]
    We have updated our scattering database. It now includes results for over one thousand snow aggregates, in addition to several other improvements. Click here for information about the new package.



    Legacy Packages


    CRYSTAL TYPE PARTICLES (columns, plates, rosettes, dendrites & sectors)
    The package includes:
     - the data file of the lookup table: scat_db2.dda
     - a subroutine to access the data: scatdb.c. The beginning portion of this program serves as the "readme".
     - sample programs (rddb.c, rddb.f  rdcmd.c) to call scatdb.c
     - a makefile to compile the above programs

    Click here to download the package
    - Updated November 12, 2010: 1. Add 3, 5, 9, 24.1 GHz for "anchor points"; 2. fix absorption at 13.5 GHz and dmax=1000um (Thanks to Stefan Kneifel).
    - Updated May 1, 2011: Add new frequencies for anchor points. Now, anchor points frequencies are: 3, 5, 9, 10, 13.4, 15, 19, 24.1, 35.6, 50, 60, 70, 80, 85.5, 90, 94, 118, 150, 166, 183, 220, 340 GHz.


    AGGREGATES
    The package includes:
     - the data file of the lookup table: scatdb_agdb.txt
     - a subroutine to access the data: scatdb_ag.c. The beginning portion of this program serves as the "readme".
     - sample programs (read_db.c, read_db.f90  rdcmd.c) to call scatdb_ag.c
     - a makefile to compile the above programs

    Click here to download the package
  • First posted on February 24, 2012.

  • - Currently only available for 260 K. Anchor point frequencies are: 10.65, 18.7, 23.8, 35.6, 89.0, 165.5 and 183.31 GHz. Any dmax values between 200 and 800 microns give the single-scattering properties of 6-bullet rosettes from "CRYSTAL TYPE PARTICLES"
  • Minor correction to program done on March 23, 2012
  • Addition of particles that have scattering cross sections plus or minus one-standard deviation of the mean. Update reading program as well. March 30, 2012
  • Modified July 18, 2012. (1) added in 13.6 GHz, (2) removed the particles added on March 30, 2012, i.e., those with +/- one std dev. from the mean. Note: arguements in the subroutine/function "scatdb_ag" have been changed as a result.


  • Click here to send comments and bugs-report

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