Northern hemisphere ice sheets and planetary waves: A strong feedback mechanism
نویسندگان
چکیده
منابع مشابه
Climatic conditions for modelling the Northern Hemisphere ice sheets throughout the ice age cycle
The ice sheet-climate interaction as well as the climatic response to orbital parameters and atmospheric CO 2 content are examined in order to drive an ice sheet model throughout an ice age cycle. Feedback processes between ice sheet and atmosphere are analyzed by numerical experiments using a high resolution General Circulation 5 Model (GCM) under different conditions at the Last Glacial Maxim...
متن کاملNumerical reconstructions of the Northern Hemisphere ice sheets through the last glacial-interglacial cycle
A 3-dimensional thermo-mechanical ice-sheet model is used to simulate the evolution of the Northern Hemisphere ice sheets through the last glacial-interglacial cycle. The ice-sheet model is forced by the results from six different atmospheric general circulation models (AGCMs). The climate evolution over the period under study is reconstructed using two climate equilibrium simulations performed...
متن کاملQuasiresonant amplification of planetary waves and recent Northern Hemisphere weather extremes.
In recent years, the Northern Hemisphere has suffered several devastating regional summer weather extremes, such as the European heat wave in 2003, the Russian heat wave and the Indus river flood in Pakistan in 2010, and the heat wave in the United States in 2011. Here, we propose a common mechanism for the generation of persistent longitudinal planetary-scale high-amplitude patterns of the atm...
متن کاملA Tropical Mechanism for Northern Hemisphere Deglaciation
We investigate the role of the tropics in the melting and reforming of the Laurentide ice sheet on glacial timescales using an atmospheric general circulation model. It is found that warming of tropical sea surface temperatures (SST) from glacial boundary conditions, as observed at the end of glacial periods [Bard et al., 1997, Lea et al., 2000, Nurnberg et al., 2000], causes a large increase i...
متن کاملGlobal Warming and Northern Hemisphere Sea Ice Extent.
Surface and satellite-based observations show a decrease in Northern Hemisphere sea ice extent during the past 46 years. A comparison of these trends to control and transient integrations (forced by observed greenhouse gases and tropospheric sulfate aerosols) from the Geophysical Fluid Dynamics Laboratory and Hadley Centre climate models reveals that the observed decrease in Northern Hemisphere...
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ژورنال
عنوان ژورنال: Journal of Climatology
سال: 1987
ISSN: 0196-1748
DOI: 10.1002/joc.3370070202