関連する実験動画
Updated: Jul 14, 2026
07:37
Resurrection of Dormant Daphnia magna: Protocol and Applications
Published on: January 19, 2018
熱帯サイクロンの数,持続時間,強度の変化 温暖化環境における熱帯サイクロンの数,持続時間,強度の変化
P J Webster1, G J Holland, J A Curry
1School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332, USA.
Science (New York, N.Y.)
|September 17, 2005
まとめ
地球温暖化によりハリケーンが激化しており,特に北太平洋とインド洋では,過去35年間で,より多くのカテゴリー4およびカテゴリー5の嵐が形成されています. この傾向は,サイクロンの発生頻度の一般的な減少と対照的です.
科学分野:
- 気候学 気候学
- 海洋学 海洋学とは
- 気象学 気象学 気象学
背景:
- 海面の気温は,過去35年間で世界中で上昇しています.
- 熱帯サイクロンの活動と強さは,海洋の温度によって影響を受けます.
研究 の 目的:
- 過去35年間の熱帯サイクロンの頻度,持続時間,強度の動向を分析する.
- 海面温度上昇とハリケーン強度の関係について調査する.
主な方法:
- 35年にわたる熱帯サイクロンのデータ分析.
- 異なる海洋盆地におけるサイクロン指標の比較.
- サイクロンの強度と海面温度記録の相関.
主要な成果:
- カテゴリー4と5の強度に達するハリケーンの数と割合の有意な増加.
- 激しいハリケーンの増加が最も顕著なのは,北太平洋,インド洋,南西太平洋で観測された.
- 北大西洋を除くほとんどの盆地におけるサイクロンとサイクロン日の総数は,過去10年間に減少した.
結論:
- 海面温度の上昇は,熱帯サイクロンの強度,特に大きなハリケーンの増加と関連しています.
- 一般的なサイクロンの頻度は一部の地域で減少しているかもしれないが,最も激しい嵐の割合は増加している.
- 将来の気候変動は,世界中でより深刻な熱帯サイクロンイベントにつながる可能性があります.
関連する概念動画
01:07What is Weather?
Overview
01:16What 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.
01:50Global 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.
01:50Threats to Biodiversity
There have been five major extinction events throughout geological history, resulting in the elimination of biodiversity, followed by a rebound of species that adapted to the new conditions. In the current geological epoch, the Holocene, there is a sixth extinction event in progress. This mass extinction has been attributed to human activities and is thus provisionally called the Anthropocene. In 2019 the human population reached 7.7 billion people and is projected to comprise 10 billion by...
02:55Temperature Dependence on Reaction Rate
The Collision Theory
Atoms, molecules, or ions must collide before they can react with each other. Atoms must be close together to form chemical bonds. This premise is the basis for a theory that explains many observations regarding chemical kinetics, including factors affecting reaction rates.
The collision theory is based on the postulates that (i) the reaction rate is proportional to the rate of reactant collisions, (ii) the reacting species collide in an orientation allowing contact between...
Atoms, molecules, or ions must collide before they can react with each other. Atoms must be close together to form chemical bonds. This premise is the basis for a theory that explains many observations regarding chemical kinetics, including factors affecting reaction rates.
The collision theory is based on the postulates that (i) the reaction rate is proportional to the rate of reactant collisions, (ii) the reacting species collide in an orientation allowing contact between...
01:27Microbes and Climate Change
Microorganisms are pivotal agents in Earth's biogeochemical cycles, significantly influencing climate dynamics through their metabolic activities. These microbes modulate the levels of key greenhouse gases by both contributing to and helping mitigate climate change.Microbial Contributions to Greenhouse Gas EmissionsRising global temperatures accelerate microbial metabolism, which, in turn, speeds up the decomposition of organic matter. This process releases carbon dioxide (CO₂) through...