Sentences with phrase «during glacial periods by»

: the fact that the ocean was colder during glacial periods by itself explains only about 10 % of the CO2 change.

Not exact matches

Using climate models to understand the physical processes that were at play during the glacial periods, the team were able to show that a gradual rise in CO2 strengthened the trade winds across Central America by inducing an El Nino - like warming pattern with stronger warming in the East Pacific than the Western Atlantic.

It seems that after the climate cooled during the last glacial period, disappearing habitat inland forced brown bears toward the coasts, where they encountered polar bears shifted there by British - Irish ice sheets.

After a relatively stable MIS 2 period, Termination 1 is marked by a rapid 13C depletion over the Glacial - Bolling transition followed by a return to somewhat heavier values during the Younger Dryas, similar to earlier observations [1].

The park covers 140 km ², of which 16 km ² is granite islands, formed by upwellings of hot magma during the Tertiary - Cretaceous period some 65 million years ago, then later smoothed by glacial ice and wave action of the sea.

For example, the uniform lowering of tropical snowline by about 900 meters during the Last Glacial Maximum is generally attributed to cooling [Porter 2001], and indeed provided the first indication that something was wrong with plankton - based estimates of tropical cooling during the glacial Glacial Maximum is generally attributed to cooling [Porter 2001], and indeed provided the first indication that something was wrong with plankton - based estimates of tropical cooling during the glacial glacial period.

Oeschger and his colleagues in Bern were the first to measure the glacial - interglacial change of atmospheric CO2 in ice cores, showing that atmospheric concentrations of CO2 during the glacial period was 50 % lower than the pre-industrial concentration, a result predicted by Arrhenius nearly a century earlier.

It seems increasingly clear that D - O events must involve major sea ice changes (and there is not much sea ice left, by comparison with what was present during the glacial period (20000 + years ago, when these events happened), so D - O events are increasingly unlikely in the future).

I look at the transitions from glacial to interglacial and see that warming is extremely rapid, overshoots by a bit, then never again exceeds the initial overshoot during the rest of the interglacial period.

For example, atmospheric carbon dioxide grew by approximately 30 % during the transition from the most recent cold glacial period, about 20,000 years ago, to the current warm interglacial period; the corresponding rate of decrease in surface ocean pH, driven by geological processes, was approximately 50 times slower than the current rate driven largely by fossil fuel burning.

Glacial periods during the 100,000 - year cycles have been characterised by a very slow build - up of ice which took thousands of years, the result of ice volume responding to orbital change far more slowly than the ocean temperatures reacted.

-- Even during glacial and interglacial periods — mainly being caused by orbital changes — CO2 content in atmosphere have followed temperature changes.

This is supported by multiple lines of evidence, including GCMs, paleoclimate evidence (including climate response to forcing during glacial periods as well as millennial proxies), the instrumental record, and the climate response to volcanic forcings among others.

The climate during glacial periods is quite different and the moisture could be brought from lower latitudes by the atmosphere.

A new study is shedding light on what that could mean for the future by providing the first direct physical evidence of a massive release of carbon from permafrost during a warming spike at the end of the last glacial period.

If it turned out that rapid climate change events are caused by comets, it would imply the climate system is far more stable than we thought, that abrupt climate change events are not part of the inherent variability of climate during glacial periods.