AUTILS

(Aerosol Utilities)

A set of utilities for computing and comparing aerosol properties.

For tutorial files and UQ tools, see the tutorial branch. The main branch has been streamlined for addition as a submodule in other code bases.

A JavaScript/web-enabled version of some of this code is available at tsipkens/autils-web, which was deployed as a web app at tsipkens.github.io/autils-web.

General notes

Unless otherwise stated, quantities are given in SI units. So:

• Diameters are given in m.
• Masses are given in kg.
• Densities are given in kg/m³.

Many of the conversions also depend on a prop structure, a MATLAB struct containing fields that describe properties of the material. Most functions only require the mass-mobility relationship, which can be initiated using the functions in the +massmob package, described below. In addition to these properties, one can also add:

• The material desnity, prop.rhom.
• The quantities prop.Dtem and prop.dp100, which are used to compute a primary particle diameter from a mobility diameter.
• The fractal prefactor, prop.kf, and fractal dimension, prop.Df, which are used to compute a radius of gyration.

Packages

+massmob

This package contains a set of tools for generating and manipulating mass-mobility property structures. The mass-mobility exponent is stored in the zet field, but a duplicate value is stored in a Dm field for backwards compatibility. This prop structure can then be given to functions like dm2mp(...) to make use of the underlying mass-mobility relation parameters. The structure, when intiated using massmob.init(...), will contain all of the renditions of the parameters related to the mass-mobility power law.

+uq

This package can be used for error modeling, including computing covariances and simulating artificial signals.

+pm

A package with tools for computing total particle mass (PM) concentration from number-based measurements, e.g., using numerical integration.