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関連する概念動画

Global Climate Change01:50

Global Climate Change

29.9K
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.
29.9K
Microbes and Climate Change01:27

Microbes and Climate Change

65
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...
65
What is Climate?01:16

What is Climate?

21.6K
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.
21.6K
The Carbon Cycle01:14

The Carbon Cycle

45.7K
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.
45.7K
Isothermal Processes01:21

Isothermal Processes

5.4K
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...
5.4K
Responses to Heat and Cold Stress02:45

Responses to Heat and Cold Stress

15.9K
Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.
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Using Generative Art to Convey Past and Future Climate Transitions
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高解像度のCO2記録を使用して評価されたプレオ・プレイストセンの気候感受性.

M A Martínez-Botí1, G L Foster1, T B Chalk1

  • 1Ocean and Earth Science, University of Southampton, National Oceanography Centre Southampton, Southampton, SO14 3ZH, UK.

Nature
|February 6, 2015
PubMed
まとめ

地球の二酸化炭素 (CO2) への気候感受性は,冷たいプレイストセーンよりも暖かいプレオセーンで低かった. この違いは氷のアルベドフィードバックによるもので,予期せぬ気候フィードバックによるものではない.

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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
  • 地球システム科学 地球システム科学

背景:

  • 放射線強制に対する気候の感受性は,背景気候条件によって異なる可能性があります.
  • この理論を検証する際には,古気候データは限られている.
  • 過去の大気中の二酸化炭素 (CO2) レベルを再構築することは,気候の感受性を理解するために極めて重要です.

研究 の 目的:

  • 地球の気候が放射力強引への感受性が背景気候に依存しているかどうかをテストする.
  • プレオセンの末期における大気中のCO2レベルを再構築する.
  • プレイストセンの末期とプレイストセンの末期における気候感受性を比較する.

主な方法:

  • CO2の再構築のために,複数の場所のボロン同位体記録を使用した.
  • プレオセンの末期 (3.3~230万年前) の気候データを分析した.
  • 氷の量の変化を考慮するために,海面の再構築が組み込まれています.

主要な成果:

  • 地球システムのCO2への感受性は,冷たいプレイストセンの後半と比較して暖かいプレオセンの半分の強さでした.
  • 感度の差は,プレイストセンの間の氷アルベドフィードバックに起因している.
  • 氷のアルベドフィードバックを考慮すると,均衡気候の感度が同一であることが判明しました.

結論:

  • 暖かいプレオセーン時代に予期せぬ気候フィードバックは発生しなかった.
  • 現在の気候モデルでは,平衡期の気候の感度がプレオセンのような未来を正確に予測しています.
  • 将来の気候予測は,長期の氷のアルベドフィードバックを除いて,CO2の倍増ごとに1.5Kから4.5Kの受け入れ範囲に一致しています.