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Aerosol Effective Radius

Other Names

Aerosol Partice Size


It is an area weighted mean radius of the aerosol particles.
Aerosol effective radius (microns) is defined as:
r = particle radius
n(r) = particle size distribution (number of particles per cm2 with radius in the range r and r+dr microns)

To characterize the size of atmospheric particles, aerosols are usually divided into three modes: the Aitken mode (diameter less than 0.5 μm), the accumulation mode (0.5 to 2.5 μm), and the coarse mode (greater than 2.5 μm). The Aitken and accumulation modes are collectively referred to as fine particles. Human produced emissions (e.g biomass burning in southern Africa and South America and Industrial pollutions) are examples of small mode aerosols. Example of the coarse mode particles are the large Africa's Sahara Desert dust particles that cross Atlantic ocean and reach America

In air pollution studies PM-2.5 aerosols are referred to particulate matter smaller than 2.5 μm that is suspended in the air. In general, submicron aerosols (particles smaller than 1 micron in diameter) affect human health by penetrating to the deepest part of human lungs.


(1) Atmospheric correction of remotely sensed surface features (5) Air Quality
(2) Monitoring of sources and sinks of aerosols (6) Health and Environment
(3) Monitoring of volcanic eruptions and forest fire (7) Earth Radiation Budget
(4) Radiative Transfer Model (8) Climate Change

GES DISC Datasets

Quick Search for 'Aerosol Effective Radius ' with Mirador
Click on the corresponding 'Data access' links in the table below to access products containing specific parameter.

Parameter Units Platform /Instrument Data Products
Begin Date End Date Data Access Doc
Aerosol Effective Radius (pixel resolution) μm UARS/HALOE 1991-10-11 2005-11-21 UARHA2FN Y

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Last updated: Dec 02, 2011 03:21 PM ET