IVULCN

Stratospheric aerosol model

Attributes

integer | discrete | dynamic | unit-less | medium

Description

The variable IVULCN selects one of the predefined stratospheric aerosol model, thus defining the aerosol optical properties (i.e., extinction, absorption and scattering) and vertical profile used for the stratospheric-layer (10-30 km). It also selects appropriate transition profiles above the stratosphere to 100 km. Meteoric dust extinction coefficients are always used for altitudes from 30 to 100 km. The available options are shown in the Table below:

Value(s)Description

0

Background stratospheric Default value

2

Moderate volcanic profile with aged volcanic extinction

3

High volcanic profile with aged fresh extinction

4

High volcanic profile with aged volcanic extinction

5

Moderate volcanic profile with fresh volcanic extinction

6

Moderate volcanic profile with background stratospheric extinction

7

High volcanic profile with background stratospheric extinction

8

Extreme volcanic profile with fresh volcanic extinction

This variable, therefore, has an impact on the simulation of the absorption-scattering processes caused by suspended particles in the sun-target-sensor optical path.

The amount/vertical profile of suspended particles is fixed .