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What are Biogeochemical Cycles?00:54

What are Biogeochemical Cycles?

31.0K
The most common elements in organic molecules, carbon, hydrogen, oxygen, nitrogen, sulfur, and phosphorus, are only available in the ecosystem in limited amounts. Therefore, these nutrients must be recycled through both biotic and abiotic components of the ecosystem, in processes generally called biogeochemical cycles.
31.0K
The Carbon Cycle01:14

The Carbon Cycle

32.8K
Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle.
32.8K
What is Climate?01:16

What is Climate?

17.5K
Climate refers to the prevailing weather conditions in a specific area over an extended period. As the saying goes, “Climate is what you expect. Weather is what you get.” Climate is influenced by geographic factors, such as latitude, terrain, and proximity to bodies of water.
17.5K
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
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
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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Updated: May 2, 2026

Removal of Exogenous Materials from the Outer Portion of Frozen Cores to Investigate the Ancient Biological Communities Harbored Inside
09:06

Removal of Exogenous Materials from the Outer Portion of Frozen Cores to Investigate the Ancient Biological Communities Harbored Inside

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エオセンの二極氷河は,地球的な炭素循環の変化と関連しています.

Aradhna Tripati1, Jan Backman, Henry Elderfield

  • 1Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK. atri02@esc.cam.ac.uk

Nature
|July 22, 2005
PubMed
まとめ

エオセンの温室効果から氷河への移行は,大気中の二酸化炭素の減少と海洋学的な変化によって引き起こされた,地球規模の大幅な冷却と氷床の増加を伴いました. 証拠によると,炭素循環の負のフィードバックが,氷床の膨張を調節した可能性があるという.

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
  • 海洋学 海洋学とは
  • 地質化学 地質化学

背景:

  • 地球の気候は,極端な暖かさ (エオセンの温室効果) から氷河期へと移行した.
  • 南極の氷床は,二酸化炭素の減少と海洋カルシート補償深度 (CCD) の変化に関連して,約3400万年前に現れた.
  • 北半球の氷河化は,はるかに遅れて (約1000万~600万年前) 発生した.

研究 の 目的:

  • 堆積物とフォアミニファルの地化学記録を用いて温室効果から氷室効果への気候変動を調査する.
  • この重要な気候変動の際に,海洋化学と海面の変化を再構築する.

主な方法:

  • 堆積物とフォアミニフェラル地化学の分析.
  • 熱帯太平洋と南大西洋におけるカルシット補償深度 (CCD) の再構築.
  • 海水の酸素とベンシック炭素同位体比の測定.

主要な成果:

  • 重要な海洋盆地におけるCCDの同期的な深化と振動の証拠は,約4200万年前から始まり,3400万年前に恒久的な深化が示されています.

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Using Generative Art to Convey Past and Future Climate Transitions
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Author Spotlight: Leaf Trait Analysis for Climate and Ecology Reconstruction in Modern and Ancient Plant Communities

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関連する実験動画

Last Updated: May 2, 2026

Removal of Exogenous Materials from the Outer Portion of Frozen Cores to Investigate the Ancient Biological Communities Harbored Inside
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Removal of Exogenous Materials from the Outer Portion of Frozen Cores to Investigate the Ancient Biological Communities Harbored Inside

Published on: July 3, 2016

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Using Generative Art to Convey Past and Future Climate Transitions
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Using Generative Art to Convey Past and Future Climate Transitions

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Author Spotlight: Leaf Trait Analysis for Climate and Ecology Reconstruction in Modern and Ancient Plant Communities
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Author Spotlight: Leaf Trait Analysis for Climate and Ecology Reconstruction in Modern and Ancient Plant Communities

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  • 海水の酸素イソトープの有意な変動 (ミリあたり1.5まで) は,100~125メートルの氷の貯蔵を示しています.
  • ベンシック炭素イソトープの同時の大規模なシフト (最大1.4 per mil) は,主要な炭素循環の混乱を指しています.

    • 結論:

    • 温室効果から氷室への移行は,大気中の二酸化炭素の進化と密接に結びついていた.
    • 炭素循環の負のフィードバックが,広範囲に広がった氷河期の始まりを3400万年前まで遅らせたのかもしれません.
    • この発見は,長期的な気候変動と氷床の動態を駆動するメカニズムについての洞察を提供します.