Greenland ice core dating pages not updating internet explorer

This suggests that greenhouse gas levels are linked to climate. Sulfuric acid is carried around the globe as an aerosol that strongly affects climate by reflecting sunlight back into space.Hydrochloric acid (HCl) and hydrofluoric acid (HF) are also produced in volcanoes and are measured in the cores as total acidity. GISP-2 cores have revealed more than 300 major eruptions over the past 9,000 years.Our editors will review what you’ve submitted and determine whether to revise the article.Join Britannica's Publishing Partner Program and our community of experts to gain a global audience for your work!The cores are handled and wrapped in clean-room facilities to prevent contamination.Coring of mountain glaciers in tropical and subtropical areas must be kept from melting.Dust is produced in arid environments, such as those found at the edge of major ice sheets, and is blown to ice-core sites when winds are strong and storm tracks are favourable.

The levels of both are much lower during glacial periods, lower than even pre-industrial levels in the modern atmosphere.This drill recovers a core several metres long and 10 cm (4 inches) in diameter.The core hole is kept open with solutions that do not freeze in order to combat the pressure of the ice that would otherwise force the hole closed as progressively deeper cores are extracted.Crystal structure helps determine age, as well as changes in temperature, snowfall, seasonality, and potential ice movement.Dust content is measured directly by lasers and by melting fractions of the ice and collecting residuals.

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Paleoclimate is studied in a more direct way by measuring the dust content in the ice, either directly or through electrical conductivity.

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