Satellite remote sensing of fires, smoke, and regional radiative energy budgets over South America and Africa

Xiang Li; Jianglong Zhang; Sundar A. Christopher; Joyce Chou; Ronald M. Welch

doi:10.1117/12.366412

20 October 1999 Satellite remote sensing of fires, smoke, and regional radiative energy budgets over South America and Africa

Xiang Li, Jianglong Zhang, Sundar A. Christopher, Joyce Chou, Ronald M. Welch

Author Affiliations +

Proceedings Volume 3756, Optical Spectroscopic Techniques and Instrumentation for Atmospheric and Space Research III; (1999) https://doi.org/10.1117/12.366412
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

Biomass burning events and their effects are investigated using measurements from the Advanced Very High Resolution Radiometer (AVHRR) over Africa in 1997 and South America in 1995. Fires are detected, and aerosol optical thicknesses of the smoke pixels identified from the AVHRR imagery are retrieved using a table look-up approach. The retrieved mean aerosol optical thickness ((tau) _0.64) ranges from 0.3 to 0.6 over Africa and from 1.2 to 1.5 over South America. The top-of-atmosphere (TOA) and surface shortwave aerosol radiative forcings (SWARF) are estimated. Using two different approaches, the mean TOA SWARFs are about -20 and -40 Wm^-2, respectively, over Africa and about -50 and -60 Wm^-2, respectively, over South America, indicating an aerosol cooling effect. Over four sites where (tau) _0.64 measurements are available, values of aerosol single scattering albedos ((omega) ₀) are retrieved and surface downward shortwave irradiances (DSWI) are estimated using a radiative transfer model. Comparison of calculated DSWIs with observed DSWIs shows that, for 9 out of 12 cases, the root-mean-square (RMS) differences are within 35 Wm^-2. The largest error is about 70 Wm^-2, which is mainly caused by the uncertainties of the retrieved (omega) ₀. This suggests that DSWI can be properly estimated from AVHRR measurements if aerosol optical thickness is available.

Citation Download Citation

Xiang Li, Jianglong Zhang, Sundar A. Christopher, Joyce Chou, and Ronald M. Welch "Satellite remote sensing of fires, smoke, and regional radiative energy budgets over South America and Africa", Proc. SPIE 3756, Optical Spectroscopic Techniques and Instrumentation for Atmospheric and Space Research III, (20 October 1999); https://doi.org/10.1117/12.366412

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available