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Diversity of Archaea III

Crenarchaeota, a prominent phylum of Archaea, is remarkable for its ability to thrive in extreme environments characterized by high temperatures and acidity. These microorganisms inhabit sulfuric hot springs, volcanic systems, and submarine hydrothermal vents, where temperatures often exceed 100°C. The unique adaptations of Crenarchaeota not only allow survival under such extreme conditions but also provide insights into the mechanisms of life in primordial Earth-like environments.Morphological...
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Archaea, one of the three domains of life, exhibit remarkable diversity and adaptability, thriving in both extreme and moderate environments. Historically, most identified archaea have been classified into two major phyla: Euryarchaeota and Crenarchaeota. However, recent molecular studies have expanded this classification to include three additional phyla: Thaumarchaeota, Nanoarchaeota, and Korarchaeota, each exhibiting unique characteristics and ecological roles.Thaumarchaeota: Mesophiles...
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Hyperthermophilic archaea are a group of extremophiles thriving at temperatures above 80°C, often in hydrothermal vents and volcanic soils where conditions surpass the boiling point of water. At such temperatures, proteins, membranes, and DNA in most organisms degrade, but hyperthermophiles have evolved remarkable adaptations to maintain stability and function.Unique Cellular FeaturesHyperthermophilic membranes are composed of a monolayer of biphytanyl tetraether lipids, which resist thermal...
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Simulation of Early Earth Hydrothermal Chimneys in a Thermal Gradient Environment
06:29

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Published on: February 27, 2021

Hospitable archean climates simulated by a general circulation model.

E T Wolf1, O B Toon

  • 1Department of Atmospheric and Oceanic Sciences, Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO 80303-7820, USA. eric.wolf@colorado.edu

Astrobiology
|July 2, 2013
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Summary
This summary is machine-generated.

The faint young Sun paradox may be resolved with moderate greenhouse gases. Climate models show that Archean Earth could have maintained liquid water with manageable carbon dioxide and methane levels.

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Area of Science:

  • * Paleoclimatology
  • * Climate modeling
  • * Geochemistry

Background:

  • * Archean Eon (circa 4 to 2.5 billion years ago) faced a dimmer Sun, posing a paradox for the presence of liquid water.
  • * Previous climate studies often used simplified models, neglecting crucial elements like clouds and ice.
  • * Isotopic reconstructions suggest potentially very hot Archean climates, challenging existing models.

Purpose of the Study:

  • * To simulate Archean climate conditions circa 2.8 billion years ago using advanced atmospheric and oceanic models.
  • * To investigate the greenhouse gas concentrations required to maintain liquid water on early Earth.
  • * To reconcile evidence for liquid water with the faint young Sun paradox.

Main Methods:

  • * Employed a coupled atmospheric general circulation and mixed-layer ocean model.
  • * Simulated climate with a 20% dimmer Sun compared to present day.
  • * Varied carbon dioxide (CO2) and methane (CH4) concentrations, alongside ocean heat transport dependent on sea ice extent.

Main Results:

  • * Achieved present-day climate conditions with 0.06 bar CO2 or 0.02 bar CO2 and 0.001 bar CH4.
  • * Found that extremely hot Archean climates are unattainable even with high CO2 levels (0.2 bar).
  • * Demonstrated that cooler Archean climates with polar ice and open oceans are sustainable with moderate greenhouse gases, aligning with paleosol and CH4 constraints.

Conclusions:

  • * Moderate greenhouse gas inventories (CO2 and CH4) can resolve the faint young Sun paradox.
  • * Habitable late Archean climates, supporting liquid water, are achievable within current climate modeling.
  • * The study supports the possibility of a habitable early Earth without invoking extreme climate conditions.