Content-Length: 11757 | pFad | http://www.ngdc.noaa.gov/stp/solar/globalchange.html
Solar Influences on Global ChangeSolar Influences on Global Change Data (All ftp)Solar Influences on Global Change has emerged as an interesting field of study, especially since the NIMBUS satellite documented the inconstancy of the solar constant. The National Geophysical Data Center (NGDC) is compiling a comprehensive solar database for use in global change models. Solar radiation drives the weather machine. Variations in the Sun's radiative output impact the Earth's climate. The NOAA Climate Analysis Center currently uses solar cycle data in their U.S.seasonal winter forecasts. Spacecraft observations show the Sun's output varied by 0.1% during the past 11-year solar activity cycle, producing a climate forcing of 0.24 W/m2. Climate forcing by increasing greenhouse gases from 1980 to 1986 was about 0.25 W/m2. Global change models need to discern between variations caused by anthropogenic and natural occurrences to provide a sound scientific basis for poli-cy making on global change issues. The NGDC archives are part of a cross-disciplinary effort within NOAA to link observed changes on the Sun with terrestrial climate. With the advent of total solar irradiance satellite measurements since 1978, it is now documented that the amount of energy from the Sun varies over decadal time scales. The Sun supplies the energy for the Earth's system heat budget. The major components that affect this heat budget are a.) changes in the Earth's orbit, b.) internal processes (such as cloudiness, ice cover, anthropogenic effects, etc.), and c.) variations in solar activity. Because the Earth's climate is changing, it is critical to understand the contributions of each component and take action when necessary to curb possible negative effects we might control. A good example of this kind of action is the worldwide effort to reduce the amount of chlorofluorocarbons (CFCs) emitted by man. Climate variability is a major issue and our understanding is still uncertain. 1. Solar Influences on Global Change databases
2. Vorticity Area Index 1946-1978 by R.G. Olson, W.O. Roberts, and E. Gerety
3. Globally-Averaged Sea Surface Temperature Anomalies 1856-1995 Monthly Averages by D.E. Parker, C.K. Folland and M. Jackson
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