関連する実験動画
Updated: Jun 24, 2026

06:27
Simulating Impacts of Ice Storms on Forest Ecosystems
Published on: June 30, 2020
まとめ
最後の氷河間期は,顕著な温度変化によって特徴づけられ,10万年前から7万年前まで続いた. この時期は氷河期に続いており,その時間軸は酸素同位体および放射線年代測定法を使用して確認されました.
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,古代気候学 (paleoclimatology) とは
- ジオクロノロジー (Geochronology) について
- 海洋地質学 海洋地質学
背景:
- 過去の気候変動の変動を理解することは,将来の気候変動を予測する上で極めて重要です.
- 以前の研究で,氷河期と氷河間期について広範なタイムラインが確立されていますが,より細かい詳細についてはさらなる調査が必要です.
研究 の 目的:
- 最後の氷河間とそれ以前の氷河期を正確に年代付けするために.
- 最後の氷河期間の気温変動を再構築するために.
主な方法:
- 酸素イソトープ (O(18) / O(16) は,深海のコアと掘削物体の分析である.
- トリウム-230/プロタクトニウム-231 (Th(230) /Pa(231)) とトリウム-230/ウラン-234 (Th(230) /U(234) を用いた放射線年代測定法で,海洋や洞窟のサンプルを採取した.
主要な成果:
- 最後の氷河間時代は10万年から7万年前に発生し,最初の主要な気温の最大値が続いて2つの小さな温度が続いた.
- この氷河間期には氷河期が先行し,12万年から10万年前まで続いた.
- スピレオテム年代測定は,深海核分析によって確立された年齢範囲を確認し,精錬しました.
結論:
- この研究は,最後の氷河間期とそれ以前の氷河期に関する精巧な年代表を提供している.
- 最後の氷河期間の詳細な気温プロファイルは,過去の気候動態の洞察を提供します.
- 組み合わせた年代測定技術は,古気候の再構築のための堅固な年齢制約を提供します.
関連する概念動画
What is Weather?
Overview
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.
Heating and Cooling Curves
When a substance—isolated from its environment—is subjected to heat changes, corresponding changes in temperature and phase of the substance is observed; this is graphically represented by heating and cooling curves.
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance, q, and its...
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance, q, and its...
Second Law of Thermodynamics
In the quest to identify a property that may reliably predict the spontaneity of a process, a promising candidate has been identified: entropy. Processes that involve an increase in entropy of the system (ΔS > 0) are very often spontaneous; however, examples to the contrary are plentiful. By expanding consideration of entropy changes to include the surroundings, a significant conclusion regarding the relation between this property and spontaneity may be reached. In thermodynamic models, the...
Thermal Expansion
The expansion of alcohol in a thermometer is one of many commonly encountered examples of thermal expansion, which is the change in size or volume of a given system as its temperature changes. The most visible example is the expansion of hot air. When air is heated, it expands and becomes less dense than the surrounding air, which then exerts an upward force on the hot air to, for example, make steam and smoke rise, and hot air balloons float. The same behavior happens in all liquids and gases,...
Cold Weather Concreting
When freshly poured concrete is exposed to freezing temperatures before it has set, the water within the concrete can freeze. This expansion disrupts the setting process, delays chemical reactions necessary for hardening, and increases the volume of pores within the hardened concrete, which weakens its overall structure. If the concrete manages to reach an appreciable strength before it freezes, the damage can be somewhat mitigated.
To counteract the negative impacts of cold weather, ensuring...
To counteract the negative impacts of cold weather, ensuring...

