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相关概念视频

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 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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Design Example: Analyzing Capacity Contours for Flood Risk Assessment01:17

Design Example: Analyzing Capacity Contours for Flood Risk Assessment

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Flood risk assessment involves careful planning and analysis to ensure the safety of communities near water retention structures. Capacity contours are a vital tool in this process, as they illustrate the potential spread of water at specific levels in a given area. In the context of building a bund across a small valley, these contours play a critical role in evaluating the safety of nearby residential areas.In this example, the bund is intended to store stormwater in the valley. The engineers...
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What is Weather?01:07

What is Weather?

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Overview
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Threats to Biodiversity01:50

Threats to Biodiversity

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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...
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Positive and Negative Feedback Loops01:18

Positive and Negative Feedback Loops

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Animal organs and organ systems constantly adjust to internal and external changes through a process called homeostasis ("steady state"). Examples of these changes include regulation of the level of glucose or calcium in the blood or internal responses to external temperatures. Homeostasis requires  maintaining an internal dynamic equilibrium:
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相关实验视频

Updated: Nov 8, 2025

Using Generative Art to Convey Past and Future Climate Transitions
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Using Generative Art to Convey Past and Future Climate Transitions

Published on: March 31, 2023

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在气候变化中超越临界点

Paul D L Ritchie1, Joseph J Clarke2, Peter M Cox2

  • 1College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter, UK. Paul.Ritchie@exeter.ac.uk.

Nature
|April 22, 2021
PubMed
概括

人类活动可能不会不可避免地导致不可逆转的气候转折点. 即使临时超过升温值,如果超值短暂,缓慢开始的倾斜元件也可能不会改变状态.

科学领域:

  • 地球系统科学
  • 气候科学
  • 古气候学

背景情况:

  • 地球的气候系统包含了临界点, 关键的值可能导致不可逆转的变化.
  • 人类活动导致的温室气体度上升可能会引发这些临界点.
  • 之前的研究表明,像冰盖这样的倾斜元素的升温门很低,

研究的目的:

  • 重新评估超越气候转折点值导致不可避免的不可逆转变化的假设.
  • 调查时间尺度在倾斜元素对临时变暖过度反应中的作用.
  • 在未来气候变化情景下评估引发倾斜事件的风险.

主要方法:

  • 利用最近开发的关于临界点和系统状态变化的理论.
  • 采用透明的简单模型的倾斜元素与定义的门.
  • 模拟全球变暖轨迹达到峰值,然后稳定在工业化前水平的1.5°C.

主要成果:

  • 证明暂时超过一个临界点值并不一定会导致系统状态的永久转变.
  • 这表明超标的持续时间,相对于倾斜元素的时间表,是至关重要的.
  • 发现缓慢开始的倾斜元素可能更适应短期的变暖过度.

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Simulating Impacts of Ice Storms on Forest Ecosystems
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Simulating Impacts of Ice Storms on Forest Ecosystems

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Watershed Planning within a Quantitative Scenario Analysis Framework

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相关实验视频

Last Updated: Nov 8, 2025

Using Generative Art to Convey Past and Future Climate Transitions
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Published on: March 31, 2023

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Simulating Impacts of Ice Storms on Forest Ecosystems
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Simulating Impacts of Ice Storms on Forest Ecosystems

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Watershed Planning within a Quantitative Scenario Analysis Framework
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结论:

  • 在超过门时不可避免的倾斜事件的假设可能是有缺陷的,特别是对于缓慢发作的元素.
  • 考虑倾斜因素和变暖超标的时间表对于准确的风险评估至关重要.
  • 未来的气候变化风险评估必须考虑暂时超过门的动态.