Hi,
I can give you some help. First, The description of particle size in the Single Scattering Database is Dmax, they are discrete values. So, how to use the Single Scattering Database with Atmlab to calculate the scattering characteristics of ramdom size? I assume your question is about how you can interpolate the data in size. For this, use the function "assp_interp_size", which is available in the database interface. Second, if Gammma size distribution is used, so, when calculating the particle number density, what is the input “r” refer to? Do I need to convert Dmax to equal volume sphere radius or Reff? I'm not fully sure what you refer to when you talk about input. Is it a specific function or are you referring to the user-guide? There exist no standard on what particle size parameter to use in the gamma distribution. In any case, you don't need to do any conversions to get the volume sphere radius r. The database also gives the volume equivalent diameter Dveq as particle size . It's called "diameter_volume_equ" in the meta data structure. So to get r: r=Dveq/2. I hope this helped. Best regards, Robin Ekelund PhD Student Department of Space, Earth and Environment +46(0)31 772 17 66 robin.ekel...@chalmers.se Chalmers University of Technology Hörsalsvägen 9/11 SE-412 96 Göteborg, Sweden www.chalmers.se ________________________________ From: arts_users.mi-boun...@mailman.rrz.uni-hamburg.de <arts_users.mi-boun...@mailman.rrz.uni-hamburg.de> on behalf of WCS <wcs19951...@163.com> Sent: Sunday, July 8, 2018 2:25:34 PM To: arts_users...@mailman.rrz.uni-hamburg.de Subject: [arts-users] two questions about the use of the single scattering database Dear All, Hello, I have two questions about the use of the single scattering database. First, The description of particle size in the Single Scattering Database is Dmax, they are discrete values. So, how to use the Single Scattering Database with Atmlab to calculate the scattering characteristics of ramdom size? Second, if Gammma size distribution is used, so, when calculating the particle number density, what is the input “r” refer to? Do I need to convert Dmax to equal volume sphere radius or Reff? Best wishes! yours, Weng Chensi
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