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GACP Website Curator: Nadia Zakharova — NASA Official: Michael I. Mishchenko

GACP Datasets

Global Aerosol Climatology for the Period August 1981 to June 2005

Monthly averages of the aerosol optical thickness and Angstrom exponent for the full period from August 1981 through June 2006 have been processed and can be downloaded from All files are in plain ASCII text and compressed using gzip.

The files format is as follows: the first line indicates the respective year and month and is followed by 180 rows of 360 floating point numbers. Each number represents the monthly average of the corresponding quantity in the respective 1°×1° grid box. The top row represents the northmost grid boxes (89°N-90°N). The first column represents the 180°W-179°W grid boxes. Absence of data is indicated by -1.

Journal articles related to the production of this dataset are listed on the GACP publications page.

For more information about the data, please contact Dr. Michael Mishchenko or Dr. Igor Geogdzhayev

Transport Models

Joyce Penner's Summary of the IPCC Model Intercomparison Workshop (PDF)

Ina Tegen's Aerosol Optical Thickness Results from Chemistry/Transport Models.

Related Datasets

Brent Holben's Summary of Aerosol Datasets (PDF)

Andrew Lacis' Database of Aerosol Spectral Refractive Indices

  • Introduction: PDF
  • FORTRAN subroutine for calculating aerosol spectral refractive indices
  • Plots of aerosol spectral refractive indices (PDF)

Trish Quinn's ACE 2 Summary (PDF)

Philip Russell's Process & Closure Study Data Summary: Part 1; Part 2 PDFs

(PDF documents require a special viewer such as the free Adobe Reader)

Individual Aerosol Datasets