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Global Climate Change01:50

Global Climate Change

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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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What is Weather?01:07

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Overview
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What is Climate?01:16

What is Climate?

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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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Increased Body Temperature01:25

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A body temperature above  38°C  (100.4 °F) is known as fever or pyrexia, and a person with fever is termed 'febrile.' Typically, the hypothalamus, a part of the brain that acts as the body's thermostat, regulates body temperature through a thermoregulatory setpoint. It receives signals from cold and warm thermal receptors throughout the body and adjusts the body's temperature accordingly. Fever occurs when this hypothalamic setpoint is altered, usually in...
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A decreased body temperature can occur in patients with hypothermia and frostbite. Heat loss with extended cold exposure overpowers the body's ability to create heat, resulting in hypothermia. Core temperature readings help classify hypothermia. Mild hypothermia is temperatures between 32 °C (89.6 °F) and 35°C (95 °F) and is caused by impaired thermoregulation. Moderate hypothermia is temperatures between 28 C (82.4 °F) and 32 °C (89.6 °F) caused by...
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Hyperthermia occurs when the body's temperature becomes unusually high, often due to heat exposure, intense physical activity, or certain illnesses. This condition can create a dangerous cycle where elevated body temperature increases the metabolic rate, generating more heat and potentially leading to organ failure and brain damage. A severe form of hyperthermia, called heat stroke, can raise body temperature to life-threatening levels. Fever, on the other hand, is a controlled form of...
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Updated: Aug 21, 2025

Wind Tunnel Experiments to Study Chaparral Crown Fires
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北極圏上空での前例のない火災活動が,気温上昇に関連している.

Adrià Descals1,2, David L A Gaveau3, Aleixandre Verger1,2,4

  • 1CREAF, Centre de Recerca Ecològica i Aplicacions Forestals, Cerdanyola del Vallès, 08193 Barcelona, Catalonia, Spain.

Science (New York, N.Y.)
|November 15, 2022
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まとめ

北極の火災は 永久凍土から大量の炭素を放出しています 温暖化により 燃え尽きた地域が急増し 北極の大火が 頻発する見込みです

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Removal of Exogenous Materials from the Outer Portion of Frozen Cores to Investigate the Ancient Biological Communities Harbored Inside
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Experimental Procedure for Laboratory Studies of In Situ Burning : Flammability and Burning Efficiency of Crude Oil
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科学分野:

  • 環境科学
  • 気候科学
  • エコロジー

背景:

  • 北極の火は永久凍土から大量の炭素を放出します
  • 衛星データは,2019~2020年にシベリアの北極で大規模な燃焼を示しています.
  • 2020年の夏は特別に暖かく,前例のない泥炭地帯の火災を引き起こしました.

研究 の 目的:

  • 北極の火災の範囲と温度との関係を分析する
  • 気候の温暖化による 将来の北極の大規模な火災のリスクを評価する.

主な方法:

  • 衛星観測を用いて1982年から2020年まで北極で燃えた地域を定量化した.
  • 火災の発生と範囲との相関を分析した.
  • 温度に関係する火災因子と年間燃焼面積の間のほぼ指数関数的な関係を特定しました.

主要な成果:

  • 2019-2020年の火災は,1982年から2020年までのシベリア北極の火災面積の44%を占めた.
  • 温度因子と年間燃焼面積との間にはほぼ指数関数的な関係が見られた.
  • 温暖化傾向は限界に近づいており,火災の危険性が高まっていることを示しています.

結論:

  • 北極の火は 永久凍土から炭素を放出する 重要な源です
  • 気候の温暖化により 北極の火災の頻度と規模が増加しています
  • 大規模な北極の火災は 温度の上限により 20世紀半ばまでにより一般的になると予測されています