Oamenii de stiinta au descoperit caci concentratia dioxidului de carbon din atmosfera planetei din urma cu 15 milioane de ani nu era prea diferita de cea de astazi, de aceea nu isi explica prea clar situatia cu padurea antarctica si nici acele paduri antarctice gigantice cu inele de crestere continua pentru copaci din urma cu 100 de milioane de ani.
Eu cred ca oamenii de stiinta nu sunt inca pregatiti sa accepte ca Pamantul se inclina la fel ca Marte intre zero grade si pana spre 70 de grade iar nu doar intre 22 si 24 de grade cum se afirma eronat astazi in ciuda dovezilor paleontologice.
O inclinatie zero ori aproape de zero pe axa a Pamantului este singura care poate explica padurile Antarctice din urma cu 15 milioane de ani, padurile Groenlandei din urma cu cateva milenii si mai ales cresterea continua a copacilor antarctici din urma cu 100 de milioane de ani, ceea ce inseamna o ziua continua cu soarele care se invarte roata la infinit aproape de orizont, ceea ce inseamna inclusiv un efect termic cumulativ.
Recent savantii au descoperit ca miliarde de ani Luna a avut un camp magnetic chiar de zece ori mai puternic decat campul magnetic terestru si ca Marte are astazi zone de camp magnetic suficient de intens in regiuni restranse aproaape de crusta planetara.
Au descoperit faptul ca timp de miliarde de ani Mercur, Venus, Luna si marte erau lumi oceanice cu o atmosfera densa si posibil chiar cu o viata abundenta la suprafata.
Scientists have now retrieved samples of pollen and leaf wax from 15.5-million- to 20-million-year-old sediments that indicate Antarctica not only received more rain during the Middle Miocene than previously thought, but was also home to trees, albeit stubby ones. The discovery implies that, contrary to previous thinking, the continent has experienced warm periods since the onset of the most recent glaciation.
To estimate Middle Miocene temperatures, precipitation and vegetation in the area now covered by the Ross Ice Shelf, Feakins and her team turned to sediment core samples taken from the ANDRILL 2 Antarctic geological drilling project in 2007. The ANDRILL rig drilled through the Ross Ice Shelf, passed through about 400 meters of water, and then penetrated more than a kilometer of sediment. Feakins and her team looked for leaf wax and pollen in sediments taken from between 144 and 1,100 meters below the seafloor — depths that date between 12 million and 20 million years ago.
The team found that concentrations of both pollen and wax spike at 16.4 million and 15.7 million years ago, representing two brief warming spells, each of which lasted less than 30,000 years. In addition, the researchers determined that the leaf wax and pollen didn’t blow in from elsewhere. It came from two species of trees — podocarp conifer and southern beech — that grew on the margins of Antarctica and don’t spread pollen widely, they reported. If the pollen were blowing in from elsewhere, they would expect to find evidence of more species. “If [pollen and wax] were being transported from the Andes and New Zealand, we would expect to find them everywhere [in the core],” Feakins says.
Feakins used a mass spectrometer to determine the ratio of hydrogen to deuterium in wax molecules, which showed how warm Antarctica was during the temperature spikes. Together with model experiments by co-author Jung-Eun Lee, a climate modeler at NASA’s Jet Propulsion Laboratory at Caltech, the results suggest that temperatures at the Ross Ice Shelf were 7 degrees Celsius in the summer, whereas the same location reaches about minus 4 degrees Celsius in summer today. Conditions were similar to what parts of Chile experience today, Feakins says. Previous studies have suggested that global average temperature during the Middle Miocene was about 3 degrees Celsius warmer than today, she says, but no one had previously estimated temperatures for this location. For temperatures to be 11 degrees Celsius warmer than today was surprising for the Middle Miocene, Feakins says, “but not completely unexpected because we expect ‘polar amplification.'” That is, when the Earth warms as a whole, polar regions warm disproportionately more than lower latitudes.
Today’s atmospheric carbon dioxide levels — 396 parts per million — are creeping up toward levels similar to those at the time of the Middle Miocene warming, which are thought to have been 400 to 600 parts per million. If trees can grow on Antarctica with carbon dioxide levels not much higher than today’s, he says, it suggests that small changes in carbon dioxide can lead to big changes in climate.