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Global Climate Change01:50

Global Climate Change

24.4K
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.
24.4K
Speciation Rates01:07

Speciation Rates

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Overview
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Hybrid Zones02:29

Hybrid Zones

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Hybrid zones are narrow regions where two closely related species interact, mate, and produce hybrids. Relative to either parent species, hybrids may possess distinct phenotypic or genetic differences that impact their survival and reproductive success. The genetic variances introduced by hybridization influence species diversity and speciation processes within the hybrid zone.
16.3K
Isothermal Processes01:21

Isothermal Processes

3.8K
A thermodynamic process that occurs at constant temperature is called an isothermal process. Heat slowly flows into the system or out of the system to maintain thermal equilibrium. Processes involving phase changes like water evaporation into steam or freezing water into ice at a constant temperature are examples of Isothermal Processes.
An ideal gas can also undergo isothermal expansion or compression.
For example, consider 1 mole of an ideal gas inside an isolated cylinder at initial volume V...
3.8K
Isochoric and Isobaric Processes01:21

Isochoric and Isobaric Processes

4.2K
A thermodynamic process that occurs at constant volume is called an isochoric process. According to the first law of thermodynamics, heat supplied or removed from the system is partially utilized to perform work and change the internal energy of the system. However, in an isochoric process, the volume remains constant. Hence, the work done by the system is zero. Therefore, the exchange of heat changes the internal energy of the system only. 
Suppose 1000 g of water is heated from 40...
4.2K
Microbes and Climate Change01:27

Microbes and Climate Change

91
Microorganisms are pivotal agents in Earth's biogeochemical cycles, significantly influencing climate dynamics through their metabolic activities. These microbes modulate the levels of key greenhouse gases by both contributing to and helping mitigate climate change.Microbial Contributions to Greenhouse Gas EmissionsRising global temperatures accelerate microbial metabolism, which, in turn, speeds up the decomposition of organic matter. This process releases carbon dioxide (CO₂) through...
91

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関連する実験動画

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Removal of Exogenous Materials from the Outer Portion of Frozen Cores to Investigate the Ancient Biological Communities Harbored Inside
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中世双極氷河化の値

Robert M Deconto1, David Pollard, Paul A Wilson

  • 1Department of Geosciences, University of Massachusetts, Amherst, Massachusetts 01003, USA. deconto@geo.umass.edu

Nature
|October 4, 2008
PubMed
まとめ
この要約は機械生成です。

オリゴセンの初期の氷河期 (Oi-1) は南極で,双極ではない. このイベントは,海底の大幅な冷却と南極の氷の増加を伴い,北半球の同時氷河化に関する以前の理論に異議を唱えました.

科学分野:

  • 古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは
  • 気候モデリング
  • 氷床のダイナミクス

背景:

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Laser-Induced Fluorescence Emission L.I.F.E. as Novel Non-Invasive Tool for In-Situ Measurements of Biomarkers in Cryospheric Habitats
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  • 中世氷河の歴史は,伝統的に南極氷河期 (約33.6万年前) と,その後に北半球氷河期 (約3.1万年前) と考えられている.
  • Oi-1イベント (~33.6 Ma) は,酸素同位体の急速な変化を示し,氷の成長と海洋の冷却を示唆しています.
  • 深海の記録と北半球の証拠を比較すると,二極の氷河化イベントとしての Oi-1 に関する疑問が生まれました.