Kekuatan yang sama seperti hari ini menyebabkan perubahan iklim 1,4 miliar tahun yang lalu--T-REC-komunitas reptil-semarang--KSE-komunitas satwa eksotik

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Kekuatan yang sama seperti hari ini menyebabkan  perubahan iklim 1,4 miliar tahun yang lalu

Kekuatan alam selalu menyebabkan iklim di Bumi berfluktuasi . Sekarang peneliti telah menemukan bukti geologi bahwa beberapa kekuatan yang sama seperti hari ini telah bermain 1,4 miliar tahun yang lalu ....read more

Same forces as
today caused climate changes 1.4 billion years ago

Date:

March 10, 2015

Source:

University of Southern
Denmark

Summary:

Natural forces have
always caused the climate on Earth to fluctuate. Now researchers have found
geological evidence that some of the same forces as today were at play 1.4
billion years ago.

........................

natural forces have
always caused the climate on Earth to fluctuate. Now researchers have found
geological evidence that some of the same forces as today were at play 1.4
billion years ago.

Fluctuating climate is a hallmark of Earth, and the present greenhouse effect
is by far the only force affecting today's climate. On a larger scale the
Earth's climate is also strongly affected by how the Earth orbits around the
sun; this is called orbital forcing of climate change. These changes happen
over thousands of years and they bring ice ages and warming periods.

Now researchers from University of Southern Denmark, China National
Petroleum Corporation and others have looked deep into Earth's history and can
reveal that orbital forcing of climate change contributed to shaping the
Earth's climate 1.4 billion years ago.

"This study helps us understand how past climate changes have affected
Earth geologically and biologically," says Donald Canfield, principal
investigator and professor at Nordic Center for Earth Evolution, University of
Southern Denmark.

The evidence comes from analyses of sedimentary records from the
approximately 1.4 billion-year-old and exceptionally well preserved Xiamaling
Formation in China.

Changes in wind patterns and ocean circulations

The sediments in the Xiamaling Formation have preserved evidence of
repeated climate fluctuations, reflecting apparent changes in wind patterns and
ocean circulation that indicates orbital forcing of climate change.

Today Earth is affected by fluctuations called the Milankovich cycles.
There are three different Milankovich cycles, and they occur each 20,000,
40,000 and 100,000 years. Over the last one million years these cycles have
caused ice ages every 100,000 years, and right now we are in the middle of a
warming period that has so far lasted 11,000 years.

"Earth's climate history is complex. With this research we can show
that cycles like the Milankovich cycles were at play 1.4 billion years ago -- a
period, we know only very little about," says Donald Canfield, adding:

"This research will also help us understand how Milankovitch cyclicity
ultimately controls climate change on Earth."

In the new scientific paper in the journal PNAS, the
researchers report both geochemical and sedimentological evidence for repeated,
short-term climate fluctuations 1.4 billion years ago. For example the
fossilized sediments show how layers of organic material differed over time,
indicating cycle changes in wind patterns, rain fall and ocean circulations.

"These cycles were a little different than today's Milankovich cycles.
They occurred every 12-16,000 years, 20-30,000 years and every 100,000 years.
They were a little shorter -- probably because the Moon was closer to Earth 1.4
billion years ago," explains Donald Canfield.







Story Source:

The above story is based on materials provided by University
of Southern Denmark.Note: Materials may be edited for content and length.







Journal Reference:

1.    Shuichang Zhang, Xiaomei Wang, Emma U.
Hammarlund, Huajian Wang, M. Mafalda Costa, Christian J. Bjerrum, James N.
Connelly, Baomin Zhang, Lizeng Bian, Donald E. Canfield. Orbital
forcing of climate 1.4 billion years ago.Proceedings of the National
Academy of Sciences, 2015; 201502239 DOI:10.1073/pnas.1502239112

http://www.sciencedaily.com/releases/2015/03/150310123351.htm

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