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Amplified greenhouse effect shaping North into South
Date:3/10/2013

e in the boreal region, despite a nearly constant rate of temperature seasonality diminishment in these regions over the past 30 years. "This may portend a decoupling between growing season warmth and vegetation productivity in some parts of the North as the ramifications of amplified greenhouse effectincluding permafrost thawing, frequent forest fires, outbreak of pest infestations, and summertime droughtscome in to play," says co-author Hans Tmmervik, Senior Researcher, Norwegian Institute for Nature Research, Troms, Norway.

According to the authors, the future does indeed look troubling: Based on analysis of 17 state-of-the-art climate model simulations, diminishment of temperature seasonality in these regions could be more than 20 degrees in latitude by the end of this century relative to the 1951-1980 reference period. The projected temperature seasonality decline by these models for the 2001-2010 decade is actually less than the observed decline. "Since we don't know the actual trajectory of atmospheric concentration of various agents capable of forcing a change in climate, long-term projections should be interpreted cautiously," says co-author Bruce Anderson, Professor of Earth and Environment at Boston University.

"These changes will affect local residents through changes in provisioning ecosystem services such as timber and traditional foods," says Research Professor Bruce Forbes, University of Lapland, Rovaniemi, Finland. They will also impact the global community through changes in regulatory ecosystem services relating to emissions of greenhouse gases. "The soils in the northern land mass potentially can release significant amounts of greenhouse gases which are currently locked up in the permanently frozen ground. Any large-scale deep-thawing of these soils has the potential to further amplify the greenhouse effect," says co-author Philippe Ciais, Associate Director, Laboratory of Climate and Environmental Science, Paris, France.


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Contact: Ranga Myneni
ranga.myneni@gmail.com
617-470-7065
Boston University
Source:Eurekalert

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