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What is Weather?01:07

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Global Climate Change01:50

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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.
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Quantifying Heat02:46

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Thermal Energy Microscopically, thermal energy is the kinetic energy associated with the random motion of atoms and molecules. Temperature is a quantitative measure of “hot” or “cold”, which depends on the amount of thermal energy. When the atoms and molecules in an object are moving or vibrating quickly, they have a higher average kinetic energy (KE) (or higher thermal energy), and the object is perceived as “hot”, or it is described as being at a higher temperature. When the...
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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.
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Heat is a type of energy transfer that is caused by a temperature difference, and it can change the temperature of an object. Since heat is a form of energy, its SI unit is the joule (J). Another common unit of energy often used for heat is the calorie (cal), which is defined as the energy needed to change the temperature of 1 g of water by 1 °C, specifically between 14.5 °C and 15.5 °C, since the energy needed shows a slight temperature dependence. Another commonly used unit is...
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海洋のダイナミクスは,海洋の熱波とその予測可能性を形作る.

Xianglin Ren1, Wei Liu2, Liping Zhang3,4

  • 1Department of Earth Sciences and Planetary Sciences, University of California Riverside, Riverside, CA, USA.

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海洋のダイナミクスは,海洋の熱波を地球規模で著しく増幅しています. これらのプロセスを理解することは,極端な出来事を予測し,海洋生態系と沿岸地域の適応戦略を開発するために不可欠です.

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科学分野:

  • 気候科学 気候科学
  • 海洋学 海洋学とは
  • 海洋生態学 海洋生態学とは

背景:

  • 海の熱波は,人類による温暖化による頻度と強度が増加しています.
  • これらの出来事は,海洋生態系と沿岸社会に重大な脅威をもたらします.
  • 海の熱波を予測するには,その背後にあるメカニズムをより深く理解する必要があります.

研究 の 目的:

  • 海洋ダイナミクスが,海洋熱波の特徴に,どのように影響するか調査する.
  • ダイナミックな海洋モデルにおける海洋熱波の振る舞いを,より単純なスラブ海洋モデルと比較するために.
  • 海洋熱波の強度,持続時間,予測可能性を左右する主要な海洋過程を特定する.

主な方法:

  • ダイナミックな海洋気候モデルシミュレーションとスラブ海洋シミュレーションの比較.
  • 熱蓄積プロセスを調べるために,混合層の熱予算分析を行います.
  • 北大西洋における海洋熱波の多年にわたる予測可能性の評価.

主要な成果:

  • 海洋のダイナミクスは,特に中高緯度と東熱帯太平洋では,海洋熱波の強度と持続時間を大幅に高めます.
  • 垂直混合と水平輸送は,海洋熱波中の熱蓄積の主要な要因である.
  • 海洋表面の極端な温度は,スラブ海洋モデルとダイナミックな海洋モデルでは,異なる大きさと時間的な進化を示しています.
  • 北大西洋の海洋熱波の堅固な多年予測可能性が特定され,大西洋南極逆転循環と関連しています.

結論:

  • 海洋のダイナミクスは,海洋の熱波の進化と予測性において不可欠な役割を果たしています.
  • 発見は,正確な気候の極端な予測のための海洋のダイナミクスを組み込むことの重要性を強調しています.
  • この研究は,海洋熱波に対する効果的な適応戦略の開発に重大な意味を持ちます.