関連する実験動画
Updated: May 4, 2026

07:16
Thermal Limits Determination for Zooplankton Using a Heat Block
Published on: November 18, 2022
1.4K
プレオセンの初期の温暖化のパターンとメカニズム
A V Fedorov1, C M Brierley, K T Lawrence
1Department of Geology and Geophysics, Yale University, New Haven, Connecticut 06511, USA. alexey.fedorov@yale.edu
Nature
|April 5, 2013
まとめ
初期のプレオセンの温暖化は,海洋の最大気温が類似しているにもかかわらず,より低い温度グラデーションを特徴づけた. 現在のモデルはこれらの条件を複製するのに苦労し,過小評価された気候フィードバックを示唆しています.
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
- 地球システム科学 地球システム科学
背景:
- プレオセンの初期 (500万~400万年前) は温暖で温帯の気候を経験した.
- その後の冷却により,大気中のCO2が約100ppm減少した可能性のある現代の温度パターンが確立されました.
- 過去の温暖な気候を理解することは,将来の気候変動を予測する上で極めて重要です.
研究 の 目的:
- プレオセンの初期の海面温度に関する地球化学的代理記録を合成する.
- 初期のプレオセンの気温グラデーションと海洋の最大気温を現在の条件と比較するために.
- 地球システムモデルを使用して,プレオセンの温暖化のための既存のメカニズムを評価する.
主な方法:
- 海洋表面温度 (SST) の地化学プロキシ記録の合成.
- メリディアンとゾーンの気温グラデーションの分析.
- 初期のプレオセンの気候条件をシミュレートするために地球システムモデルを利用する.
主要な成果:
- 初期のプレオセンは,今日よりもかなり低いメリディアンおよびゾーン温度グラデーションを示した.
- プレオセンの初期における海洋の最大気温は,現在の水準に類似していた.
- 既存の提案されたメカニズムは,観測された初期のプレオセンのすべての気候特性を同時に再現できませんでした.
結論:
- 過小評価されたダイナミック・フィードバックの組み合わせが,初期のプレオセンの気候を説明する可能性がある.
- 海洋の混合と雲のアルベドに関連するフィードバックは,さらなる調査を正当化します.
- 過去の温暖な気候状態を正確に表現するために,改善された気候モデルが必要です.
関連する概念動画
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
Mechanism of heat transfer
2.3K
Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...
2.3K
Mechanisms of Heat Transfer I
5.8K
Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
5.8K
Mechanisms of Heat Transfer II
4.5K
In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
4.5K
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...
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
Mechanisms of Heat Transfer
1.9K
Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant...
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant...
1.9K

