Solar Contribution To Global Warming Predicted To Decrease

TERRADAILY

there is little argument that the Sun has a very big impact on Earth, but the nature of that impact over time on the climate is an issue of increasing debate

London - Oct 07, 2003
New research on the sun's contribution to global warming is reported in this month's Astronomy & Geophysics. By looking at solar activity over the last 11,000 years, British Antarctic Survey (BAS) astrophysicist, Mark Clilverd, predicts that the sun's contribution to warming the Earth will reduce slightly over the next 100 years.

This is a different picture to the last century when solar flares, sunspots and geomagnetic storms, increased in number. This rise is simultaneous with emissions of greenhouses gases and an estimated increase in solar heat output, which together have warmed the Earth's temperature by a global average of 0.7 degrees centigrade.

The solar contribution to the increase is variously estimated to be around 4-20% leaving greenhouse gases to make up the remaining 80%. Clilverd and colleagues conclude that solar activity is about to peak and predict less activity in the next 100 years, with the occurrence of space storms likely to decline by two thirds. Their assumption is that the solar heat output will decline slightly accordingly.

Clilverd examined data from sun spot activity, geomagnetic storm indices and looked at the variation of atmospheric radiocarbon derived from studies of tree rings and marine sediments to make his predictions.

He says, "This work is speculative and relies on the idea that the sun shows regular cycles of activity on timescales of 10 � 10,000 years and that its heat output and activity are related. But we believe the work is well grounded and the effect of solar activity on Earth's environmental system will not increase in the way it has during the last century. We should take this into account when trying to understand the impact of human activity on our climate system."

Although solar activity may reduce in 2100, Clilverd predicts it will return to its current levels by 2200.

Clilverd continues, "This research is important for understanding the severity and impact of climate change in coming centuries. As noted by Intergovernmental Panel on Climate Change in the Third Assessment Report, published in 2001, anthropogenic emissions of greenhouse gases are highly likely to cause warming of the Earth, but factors such as solar variability could amplify or subdue the effect."

TERRADAILY

Early Arctic Thaw May And The Carbon Balance

Pasadema (JPL) Sep 30, 2003
Spring will be coming early next year to the great forests and tundra of the Arctic. Good for the vegetation, but perhaps not so good for the atmosphere. Spring in the high latitudes has been coming earlier in the past few decades. The early thaw means a longer growing season for the Arctic and the boreal forest, the ring of mostly evergreen trees that stretches across the northern reaches of North America and Eurasia. It also means that more carbon, now stored in the region's usually frozen soils, may be released into the air.

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