Variations in mercury deposition to Antarctica over the past 34,000 years

Article Abstract:

Atmospheric mercury deposition to the Antarctic ice cap in the past 34,000 years was examined using stringent trace metal-cleaning methods. The results showed that mercury concentrations were significantly elevated about 18,000 years ago, during the last glacial maximum which was characterized by high oceanic productivity. The results suggest that oceanic productivity is the main pre-industrial source of Antarctic mercury. Aside from serving as a paleoproductivity indicator, the results also provide a baseline for studying recent anthropogenic mercury emissions.

Antarctica, Antarctic regions, Ice, Mercury, Mercury (Metal)

---

Ozone clouds over the Atlantic

Article Abstract:

New measurements taken on airline jets indicate that air pockets of extremely high ozone concentration are in some manner entering from the stratosphere to the troposphere over the tropical Atlantic. Normally, about 90% of all ozone is situated in the stratosphere, which is that part of the Earth's atmosphere above 10-20 kilometers from the ground, and 10% is located in the troposphere, which is the region immediately below the stratosphere extending down to ground level. Ozone and ultraviolet radiation in the troposphere have numerous negative implications.

Atmospheric ozone, Ozone layer

---

Meteoric smoke fallout over the Holocene epoch revealed by iridium and platinum in Greenland ice

Article Abstract:

A record of iridium and platinum fluxes on a climatic-cycle timescale, back to 128,000 years ago, from a Greenland ice core, is reported. It is stated that unexpectedly constant fallout of extraterrestrial matter to Greenland occurred during the Holocene, whereas a greatly enhanced input of terrestrial iridium and platinum masked the cosmic flux in the dust-laden atmosphere of the last glacial age.

Science & research, Ice crystals, Glacial climates, Ice cores

Similar abstracts:

• Abstracts: Climatic controls on central African hydrology during the past 20,000 years. Eruptions linked to EL Nino
• Abstracts: Stable phytoplankton community structure in the Arabian Sea over the past 200,000 years. Palaeoceanographic implications of genetic variation in living North Atlantic Neogloboquadrina pachyderma
• Abstracts: Effect of orogeny, plate motion and land-sea distribution on Eurasian climate change over the past 30 million years
• Abstracts: Great moments in disorder. Freedom for the poles
• Abstracts: Theory predicts the uneven distribution of genetic diversity within species. Species diversity can drive speciation

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.