Universiti Teknologi Malaysia Institutional Repository

Aerosols and their influence on radiation partitioning and savanna productivity in northern Australia

Kanniah, Kasturi Devi and Beringer, Jason and Tapper, Nigel J. and Long, Chuck N. (2010) Aerosols and their influence on radiation partitioning and savanna productivity in northern Australia. Theoretical and Applied Climatology, 100 (3-4). pp. 423-438. ISSN 0177-798X

Full text not available from this repository.

Official URL: http://dx.doi.org/10.1007/s00704-009-0192-z

Abstract

Aerosols have been shown to affect the quantity and quality of solar radiation on the Earth's surface. Savanna regions are subject to frequent burning and release of aerosols that may impact on radiation components and possibly vegetation productivity in this region. Therefore, in this study, we have analyzed the optical properties of aerosols (aerosol optical depth (AOD) and Angstrom coefficient) from the Atmospheric Radiation Measurement site in Darwin for the periods from April 2002 to June 2005 as measured by a multifilter rotating shadowband radiometer. The influence of aerosols and their effect on surface shortwave incoming solar radiation and savanna productivity were examined for the dry season using sky radiation collection of radiometers and eddy covariance measurements from the Howard Springs flux site. Results indicated that aerosol concentrations in the region were relatively low compared to other savanna regions with the maximum monthly average AOD over the period being the greatest in October (0.29±0.003 standard error at 500 nm). The highest monthly average Angstrom exponent was also found in October (1.38±0.008). The relatively low aerosol concentration in this region can be attributed to the mixture of smoke aerosols with humidity haze and local circulations. Over a range of AODs from 0.1 to 0.4, we found a modest increase in the fraction of diffuse radiation to total radiation from 11% to 21%. This small increase in diffuse fraction did not affect the carbon flux significantly. However, because the current range of AOD in the region is relatively low, the region could be sensitive to increases in aerosols and diffuse fraction in the future.

Item Type:Article
Uncontrolled Keywords:aerosol, carbon flux, dry season, eddy covariance, optical depth, radiative forcing, radiometer, savanna, solar radiation
Subjects:Q Science > Q Science (General)
T Technology > T Technology (General)
Divisions:Science
ID Code:13224
Deposited By: S.N.Shahira Dahari
Deposited On:25 Jul 2011 10:02
Last Modified:25 Jul 2011 10:02

Repository Staff Only: item control page