Modelled atmospheric temperatures and global sea levels over the past million years

Article Abstract:

A coupled model is used of the Northern Hemisphere ice sheets and ocean temperatures, forced to match an oxygen isotope record for the million years compiled from 57 globally distributed sediment cores, to quantify both contributions simultaneously. The model yields that the ice-sheet contribution to the variability in oxygen isotope composition varied from ten percent in the beginning of glacial periods to sixty percent at glacial maxima suggesting that strong ocean cooling precedes slow ice-sheet build up.

Observations, Ice sheets, Atmospheric temperature, Northern Hemisphere

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The twentieth century was the wettest period in northern Pakistan over the past millennium

Article Abstract:

An annually resolved oxygen isotope record from tree-rings is presented providing a millennial-scale reconstruction of precipitation variability in the high mountains of northern Pakistan. Comparison with other long-term precipitation reconstruction indicates a large-scale intensification of the hydrological cycle coincident with the onset of industrialization and global warming, and the unprecedented amplitude argues for a human role.

Pakistan, Precipitation (Meteorology)

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effect of the formation of the Isthmus of Panama on Atlantic Ocean thermohaline circulation

Article Abstract:

The timing and consequences of oceanographic events associated with the formation of the Isthmus of Panama, which completely closed the seaway between the continents of North and South America 2.7 million years ago, remain unclear. A new study, using palaeoceanographic information from deep-ocean cores, shows that the closure of the Panamanian Isthmus first affected deep-ocean circulation and climate some 4.6 million years ago.

Research, Origin, Ocean circulation, Paleoceanography, Isthmus of Panama

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