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Providing Insight
Into Climate Change
The Sun
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43 Articles

Solar Signature in Northern Temperature Since 1600

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N. Scafetta of Duke University, Durham, NC and B.J. West of the US Army Research Office, NC studied the solar impact on 400 years of the Northern Hemisphere temperatures. The Phenomenological approach is used to determine the portion of the warming since 1900 is due to the Sun versus other factors, such as CO2 induced warming. The study compares the variations of Sun proxies to the temperature record and concludes that the Sun has contributed 50% to 69% of the recorded surface warming from 1900 to 2005 depending on the temperature reconstruction and satellite data used. The authors recognized that the surface temperature record is contaminated by the urban heat island effect but did not correct the record for the effect. FOS notes that if the temperature record were corrected for the urban warming effect, the study would show the Sun contributing at least 75% of the warming.



The Varying Sun and Climate Change

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Willie Soon and Sallie Baliunas examine the relationship between the varying solar magnetism and Earth's climate. They show that recent climate changes are likely mostly natural and result from the varying output of the Sun.



ACRIM Composite Total Solar Irradiance

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This plot shows the total solar irradiance (TSI) from satellite data from www.acrim.com. The TSI minima trend between solar cycles 21 - 23 is +0.037%/decade. The minima at the end of solar cycle 23 is significantly less than the minima at the end of solar cycle 22.



Solar Climatic Effects

This article from CO2 Science summarized the results of several studies that show the Sun's effects on climate.



Solar Activity Drives 20th-Century Global Warming

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This CO2 Science article determines the relative contribution of CO2 and the Sun's changes on the 20th Century warming, and shows that CO2 has contributed 15% to 20% while the Sun has contributed 80% to 85%.




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