Negligible glacial-interglacial variation in continental chemical weathering rates

Article Abstract:

The high-resolution records of the lead isotope composition of the North Atlantic Ocean that cover the past 550,000 years have shown that chemical weathering rates are two to three times lower in the glaciated interior of the North Atlantic Region during glacial periods than during the intervening interglacial periods. The enhanced weathering of silicate glacial sediments during interglacial periods has resulted in a net draw-down of atmospheric carbon dioxide, creating a positive feedback on global climate that promotes cooling and further glaciation.

Atlantic Ocean, Environmental aspects, North Atlantic Ocean, Radioactive dating, Radiometric dating, Chemical weathering

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Strong hemisphere coupling of glacial climate through freshwater discharge and ocean circulation

Article Abstract:

An extended and quantitative bipolar seesaw concept is used for explaining the timing and amplitude of Greenland and Antarctic temperature changes. This concept provides a framework for solving queries related to timing, amplitude and spacial extent of Dansgaard-Oeschgear (DO) and Heinrich events, the slow timescale associated with Antarctic warm phases, the similarity and lag of sea level to southern temperature and source of the meltwater discharge.

United States, Ocean circulation

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Homogeneous climate variability across East Antarctica over the past three glacial cycles

Article Abstract:

Through isotopic profiles of ice cores taken from various regions in East Antarctica, geologists have discovered a uniformity in both large and small climatic events in the region over the last 3 galcial cycles. The article infers that this may be due to the similar geology across the entire plateau, and its even proximity to the ocean.

Antarctica, History, Discovery and exploration, Geological research

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