100 sure prediction for today 90

100 sure prediction for today 90

It is not to be confused with.

Climate change during the last 65 million years as expressed by the oxygen isotope composition of benthic foraminifera.

The Paleocene-Eocene Thermal Maximum (petm) is characterized by a brief but prominent negative excursion, attributed to rapid warming.

Note that the excursion is understated in this graph due to the smoothing of data.

The, paleoceneEocene Thermal Maximum pETM alternatively eocene thermal maximum 1 " eTM1 and formerly known as the ".

Initial Eocene " or late Paleocene Thermal Maximum was a time period with a more than 58 C global average temperature rise across the event.

1, this climate event occurred at the time boundary of the.

Paleocene and, eocene geological epochs.

2, the exact age and duration of the event is uncertain but it is estimated to have occurred around.5 million years ago.

3, the associated period of massive carbon release into the atmosphere has been estimated to have lasted from 20,000 to 50,000 years.

The entire warm period lasted for about 200,000 years.

Global temperatures increased by.

1, the onset of the PaleoceneEocene Thermal Maximum has been linked to volcanism and uplift associated with the.

North Atlantic Igneous Province, causing extreme changes in Earth's carbon cycle and a significant temperature rise.

4 1 5, the period is marked by a prominent negative excursion in carbon stable isotope ( 13C ) records from around the globe; more specifically, there was a large decrease in 13C/ 12C ratio of marine and terrestrial carbonates and organic carbon.

1 6 7 Paired 13C, 11B, and 18O data suggest that 12000 Gt of carbon (at least 44000 Gt CO 2e ) were released over 50,000 years, 4 averaging.24 Gt per year.

Stratigraphic sections of rock from this period reveal numerous other changes.

1 Fossil records for many organisms show major turnovers.

For example, in the marine realm, a mass extinction of benthic foraminifera, a global expansion of subtropical dinoflagellates, and an appearance of excursion, planktic foraminifera and calcareous nanofossils all occurred during the beginning stages of petm.

On land, modern mammal orders (including primates ) suddenly appear in Europe and in North America.

Sediment deposition changed significantly at many outcrops and in many drill cores spanning this time interval.

Since at least 1997, the PaleoceneEocene Thermal Maximum has been investigated in geoscience as an analog to understand the effects of global warming and of massive carbon inputs to the ocean and atmosphere, including ocean acidification.

8 Humans today emit about 10 Gt of carbon (about 37 Gt CO2e) per year, and will have released a comparable amount in about 1,000 years at that rate.

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