Reconciling anthropogenic climate change with observed temperature 1998–2008
Robert K. Kaufmanna,1, Heikki Kauppib, Michael L. Manna, and James H. Stockc
aDepartment of Geography and Environment, Center for Energy and Environmental Studies, Boston University, 675 Commonwealth Avenue (Room 457), Boston, MA 02215;
bDepartment of Economics, University of Turku, FI-20014, Turku, Finland; and cDepartment of Economics, Harvard University, 1805 Cambridge Street, Cambridge, MA 02138
Edited by Robert E. Dickinson, University of Texas at Austin, Austin, TX, and approved June 2, 2011 (received for review February 16, 2011)
Abstract
Given the widely noted increase in the warming effects of rising greenhouse gas concentrations, it has been unclear why global surface temperatures did not rise between 1998 and 2008. We find that this hiatus in warming coincides with a period of little increase in the sum of anthropogenic and natural forcings. Declining solar insolation as part of a normal eleven-year cycle, and a cyclical change from an El Nino to a La Nina dominate our measure of anthropogenic effects because rapid growth in short-lived sulfur emissions partially offsets rising greenhouse gas concentrations.
As such, we find that recent global temperature records are consistent with the existing understanding of the relationship among global surface temperature, internal variability, and radiative forcing, which includes anthropogenic factors with well known warming and cooling effects.
aerosol emissions ∣ carbon emissions ∣ coal consumption ∣ black carbon ∣ stratospheric water vapor
+++++
NOTA DESTE BLOGGER:
Que o clima está muito maluco, isso ninguém pode negar. Todavia, sempre fui cético localizado do aquecimento global ser um fenômeno antropogenicamente provocado. Temos a nossa parcela de culpa, mas o fenômeno não é UNICAMENTE provocado pelo homem. É simplesmente um fenômeno natural cíclico.
Será que a Grande Mídia dará destaque a este estudo que contraria as posições de Al 'Apocalipse' Gore e seus discípulos??? Pagar para ver... Talvez tenha que morder a língua.
Será que a Grande Mídia dará destaque a este estudo que contraria as posições de Al 'Apocalipse' Gore e seus discípulos??? Pagar para ver... Talvez tenha que morder a língua.
