Spatial patterns and recent trends in cloud fraction and cloud-related diffuse radiation in Amazonia

Butt, Nathalie, New, Mark, Lizcano, Gil and Malhi, Yadvinder (2009) Spatial patterns and recent trends in cloud fraction and cloud-related diffuse radiation in Amazonia. Journal of Geophysical Research D: Atmospheres, 114 D21: . doi:10.1029/2009JD012217

Author Butt, Nathalie
New, Mark
Lizcano, Gil
Malhi, Yadvinder
Title Spatial patterns and recent trends in cloud fraction and cloud-related diffuse radiation in Amazonia
Journal name Journal of Geophysical Research D: Atmospheres   Check publisher's open access policy
ISSN 0148-0227
Publication date 2009-01-01
Year available 2009
Sub-type Article (original research)
DOI 10.1029/2009JD012217
Volume 114
Issue D21
Total pages 9
Place of publication Hoboken, NJ United States
Publisher Wiley-Blackwell Publishing, Inc
Language eng
Subject 1902 Film, Television and Digital Media
1908 Geophysics
1901 Art Theory and Criticism
1912 Space and Planetary Science
Formatted abstract
 As the climate of tropical forest regions changes, there are likely to be concurrent changes in cloud cover and in the light regime experienced by tropical forest canopies. We utilize data from the International Satellite Cloud Climatology Project to examine spatial patterns and trends in cloud cover over Amazonia during the period 1984-2006. Cloud cover seasonality appears to be increasing in Amazonia, with a significant decline in dry season cloud fraction (0.3% yr-1) and increase in wet season cloud fraction (0.1% yr -1) over the last two decades. A novel cloud-related diffuse radiation (CRDR) climatology for Amazonia was derived from satellite cloud data. There is a clear decreasing gradient from the northwest to the southeast: annual CRDR proportion (CRDRP) varies by about 15% across the region. Analysis of trends over time indicates a 1 -2% decline in CRDRP in Amazonia over the last two decades, particularly in the east of the region. This is particularly marked in the dry season in the east where CRDRP declined at a rate of 0.3% yr-1, and the wet season decline was 0.1% yr-1. In the west of the region a 1% increase in CRDRP is indicated. Changes in forest composition and productivity may be linked to changes in CRDRP in that decreases in cloud cover in sunny regions or dry seasons may cause a decline in productivity, whereas declines in cloud cover in cloudy regions, or during cloudy seasons, may cause an increase in productivity.
Keyword Amazonia
Cloud cover
Light regime
Tropical forest
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Biological Sciences Publications
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Citation counts: TR Web of Science Citation Count  Cited 11 times in Thomson Reuters Web of Science Article | Citations
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Created: Thu, 29 May 2014, 01:44:24 EST by Nathalie Butt on behalf of School of Biological Sciences