Editorial Type:
Article
Article Type:
Research Article

Trends in Daily Solar Radiation and Precipitation Coefficients of Variation since 1984

David Medvigy Department of Geosciences, and Atmospheric and Oceanic Sciences, Princeton University, Princeton, New Jersey

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Claudie Beaulieu Atmospheric and Oceanic Sciences, Princeton University, Princeton, New Jersey

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Print Publication:
15 Feb 2012
DOI:
https://doi.org/10.1175/2011JCLI4115.1
Page(s):
1330–1339
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Abstract

This study investigates the possibility of changes in daily scale solar radiation and precipitation variability. Coefficients of variation (CVs) were computed for the daily downward surface solar radiation product from the International Satellite Cloud Climatology Project and the daily precipitation product from the Global Precipitation Climatology Project. Regression analysis was used to identify trends in CVs. Statistically significant changes in solar radiation variability were found for 35% of the globe, and particularly large increases were found for tropical Africa and the Maritime Continent. These increases in solar radiation variability were correlated with increases in precipitation variability and increases in deep convective cloud amount. The changes in high-frequency climate variability identified here have consequences for any process depending nonlinearly on climate, including solar energy production and terrestrial ecosystem photosynthesis. To assess these consequences, additional work is needed to understand how high-frequency climate variability will change in the coming decades.

Corresponding author address: David Medvigy, Department of Geosciences, Princeton University, 418B Guyot Hall, Princeton, NJ 08544. E-mail: dmedvigy@princeton.edu

Abstract

This study investigates the possibility of changes in daily scale solar radiation and precipitation variability. Coefficients of variation (CVs) were computed for the daily downward surface solar radiation product from the International Satellite Cloud Climatology Project and the daily precipitation product from the Global Precipitation Climatology Project. Regression analysis was used to identify trends in CVs. Statistically significant changes in solar radiation variability were found for 35% of the globe, and particularly large increases were found for tropical Africa and the Maritime Continent. These increases in solar radiation variability were correlated with increases in precipitation variability and increases in deep convective cloud amount. The changes in high-frequency climate variability identified here have consequences for any process depending nonlinearly on climate, including solar energy production and terrestrial ecosystem photosynthesis. To assess these consequences, additional work is needed to understand how high-frequency climate variability will change in the coming decades.

Corresponding author address: David Medvigy, Department of Geosciences, Princeton University, 418B Guyot Hall, Princeton, NJ 08544. E-mail: dmedvigy@princeton.edu
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