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Global Climate Change01:50

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Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
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The eukaryotic promoter region is a segment of DNA located upstream of a gene. It contains an RNA polymerase binding site, a transcription start site, and several cis-regulatory sequences.  The proximal promoter region is located in the vicinity of the gene and has cis-regulatory sequences and the core promoter. The core promoter is the binding site for RNA polymerase and is usually located between -35 and +35 nucleotides from the transcription start site. The distal promoter regions are...
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Global peatland initiation driven by regionally asynchronous warming.

Paul J Morris1, Graeme T Swindles2, Paul J Valdes3

  • 1School of Geography, University of Leeds, Leeds LS2 9JT, United Kingdom; p.j.morris@leeds.ac.uk.

Proceedings of the National Academy of Sciences of the United States of America
|April 19, 2018
PubMed
Summary
This summary is machine-generated.

Peatland initiation, a key carbon sink, was mainly driven by warming temperatures and increased plant growth globally. Unique precipitation changes triggered peatland formation in Western Siberia, while tropical peatlands relied on non-climatic factors.

Keywords:
GCMbasal date catalogbioclimatebiogeographydeglaciation

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Area of Science:

  • Paleoclimatology
  • Ecosystem Science
  • Geomorphology

Background:

  • Peatlands are crucial global carbon sinks, but the triggers for their widespread initiation since the Last Glacial Maximum remain poorly understood.
  • The specific influence of climate on peat initiation is a significant knowledge gap.

Purpose of the Study:

  • To investigate the climatic and non-climatic drivers of peatland initiation across diverse global regions.
  • To clarify the role of climate, specifically temperature and precipitation, in peatland genesis.

Main Methods:

  • Utilized a general circulation model to simulate local climate changes during peatland initiation events.
  • Analyzed data from 1,097 peatland initiation sites worldwide.

Main Results:

  • Global peat initiation in deglaciated areas was primarily driven by warming growing seasons, enhancing plant productivity.
  • Western Siberian peatland initiation was uniquely triggered by increased precipitation, reducing soil respiration.
  • Tropical peat initiation showed weak climate links, suggesting non-climatic factors like tectonic subsidence were dominant.

Conclusions:

  • Warming growing seasons are the primary global driver of peatland initiation in deglaciated regions.
  • Regional climate variations and non-climatic factors play significant roles in peatland genesis.
  • Understanding these drivers is vital for predicting ecological changes in carbon-dense ecosystems under future climate scenarios.