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The Role of Clouds in Global Radiation Changes Measured in Israel during the Last Sixty Years

American Journal of Climate Change 2019年第1期8卷 61-76页

作者： Indira Paudel Shabtai Cohen gerald stanhill Department of Environmental Physics and Irrigation Institute of Soil Water and Environmental Sciences Rishon Le Zion Israel Department of Forestry and Natural Resources Purdue University IN USA

An analysis of global radiation measurements and fractional cloud cover observations made in the Israel Meteorological Service’s network of climate stations demonstrated a significant decrease in the transmittance of solar radiation through the atmosphere during the last 60 years. The major cause was the reduced transparency of clouds. Under completely overcast skies with complete cloud cover transmission in the industrialized central coastal region decreased from 0.41 in the mid-20th century to 0.21 in the first decade of the 21st century. Under cloudless skies the reduction in the transmission of global radiation was less, from 0.79 to 0.71, and not statistically significant. Similar but somewhat smaller changes were observed in the less industrialized central hill region. Multi-linear analysis showed that since 1970, 61% of the measured decline in global radiation was attributable to changes in fractional cloud cover but only 2% to the marked increase in local fuel combustion;there was no statistically significant interaction between the two parameters.

关键词： Cloud Transmission Fractional Cloud Cover Dimming and Brightening Direct and Indirect Aerosol Effects Fossil Fuel Combustion

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