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

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, w...

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Main Authors:	Kanniah, Kasturi Devi, Beringer, Jason, Tapper, Nigel J., Long, Chuck N.
Format:	Article
Published:	Springer Verlag 2010
Subjects:	G70.39-70.6 Remote sensing
Online Access:	http://eprints.utm.my/id/eprint/13224/ http://dx.doi.org/10.1007/s00704-009-0192-z
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id	my.utm.13224
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spelling	my.utm.132242022-07-26T04:27:52Z http://eprints.utm.my/id/eprint/13224/ Aerosols and their influence on radiation partitioning and savanna productivity in northern Australia Kanniah, Kasturi Devi Beringer, Jason Tapper, Nigel J. Long, Chuck N. G70.39-70.6 Remote sensing 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. Springer Verlag 2010-05 Article PeerReviewed 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). pp. 423-438. ISSN 0177-798X http://dx.doi.org/10.1007/s00704-009-0192-z doi:10.1007/s00704-009-0192-z
institution	Universiti Teknologi Malaysia
building	UTM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Teknologi Malaysia
content_source	UTM Institutional Repository
url_provider	http://eprints.utm.my/
topic	G70.39-70.6 Remote sensing
spellingShingle	G70.39-70.6 Remote sensing Kanniah, Kasturi Devi Beringer, Jason Tapper, Nigel J. Long, Chuck N. Aerosols and their influence on radiation partitioning and savanna productivity in northern Australia
description	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.
format	Article
author	Kanniah, Kasturi Devi Beringer, Jason Tapper, Nigel J. Long, Chuck N.
author_facet	Kanniah, Kasturi Devi Beringer, Jason Tapper, Nigel J. Long, Chuck N.
author_sort	Kanniah, Kasturi Devi
title	Aerosols and their influence on radiation partitioning and savanna productivity in northern Australia
title_short	Aerosols and their influence on radiation partitioning and savanna productivity in northern Australia
title_full	Aerosols and their influence on radiation partitioning and savanna productivity in northern Australia
title_fullStr	Aerosols and their influence on radiation partitioning and savanna productivity in northern Australia
title_full_unstemmed	Aerosols and their influence on radiation partitioning and savanna productivity in northern Australia
title_sort	aerosols and their influence on radiation partitioning and savanna productivity in northern australia
publisher	Springer Verlag
publishDate	2010
url	http://eprints.utm.my/id/eprint/13224/ http://dx.doi.org/10.1007/s00704-009-0192-z
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score	13.211869

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

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