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パレオセノ/エオセノ熱最大期における湿った気候状態
Gabriel J Bowen1, David J Beerling, Paul L Koch
1Earth Sciences Department, University of California, Santa Cruz, California 95064, USA. gbowen@biology.utah.edu
Nature
|November 27, 2004
まとめ
パレオセーン/エオセーン熱最大 (PETM) 温暖化イベントには,かなりの炭素の放出が含まれていました. 新しい発見は,気温の上昇と陸上の炭素循環による気候システムのシフトを明らかにし,それはメタンの放出によってのみ説明されるものではありません.
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
- 地質化学 地質化学
- 気候モデリング
背景:
- 5500万年前のパレオセーン/エオセーン熱最大 (PETM) は,急速な地球温暖化 (5~10°C) によって特徴づけられました.
- このイベントは,メタン水素貯蔵庫から大量の炭素 (1,050-2,100 Gt) の放出と関連しています.
- メタンの酸化による直接的な温室効果を伴う以前の説明は,観測された温暖化の規模とタイミングを完全に説明するのに苦労しました.
研究 の 目的:
- 海洋と陸上の炭素同位体記録の間の不一致をPETMで調査する.
- 炭素循環モデルを使用して,これらの同位体差の根本的な原因を特定する.
- PETMの間,突然の気候変動を誘発するメカニズムを理解する.
主な方法:
- 海洋と陸上の炭素同位体記録をPETM全体で分析した.
- 重要な炭素循環プロセスをシミュレートする計算モデルの適用.
- 気候システムの動態を推論するために,地質学的証拠とモデル出力の比較.
主要な成果:
- PETMからの海洋と陸上の炭素同位体データセットの間で大きな違いが特定されました.
- モデルシミュレーションは,PETMの間に気候システム状態の明確なシフトを示唆しています.
- 証拠は,中緯度の熱帯圏湿度の上昇と,地上の炭素循環の増大を指しています.
結論:
- PETMの温暖化は,メタン水酸化物の放出による直接的な温室効果ガスの強制によってのみ説明できない.
- 大気湿度の上昇を含む気候システムの重要なシフトは,PETM温暖化に決定的な役割を果たしました.
- この気候システムシフトの根本的な原動力は,将来の研究のための開かれた領域であり続ける.
関連する概念動画
What is Climate?
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.
Global Climate Change
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.
Conditions on Early Earth
Around 4 billion years ago, oceans began to condense on earth while volcanic eruptions released nitrogen, carbon dioxide, methane, ammonia, and hydrogen into the primordial atmosphere. However, organisms with the characteristics of life were not initially present on earth. Scientists have used experimentation to determine how organisms evolved that could grow, reproduce, and maintain an internal environment.
Conditions on Early Earth
Around 4 billion years ago, oceans began to condense on earth while volcanic eruptions released nitrogen, carbon dioxide, methane, ammonia, and hydrogen into the primordial atmosphere. However, organisms with the characteristics of life were not initially present on earth. Scientists have used experimentation to determine how organisms evolved that could grow, reproduce, and maintain an internal environment.
Isothermal Processes
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...
Thermoregulation
The human body has a sophisticated thermoregulation system that employs negative feedback mechanisms to maintain an optimal core temperature. When the core temperature drops, peripheral and central thermoreceptors send signals to the hypothalamus, activating the heat-promoting center. This center triggers several responses aimed at increasing the core temperature. First, vasoconstriction reduces the flow of warm blood from internal organs to the skin so that the heat is not lost from the skin,...

