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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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Speciation Rates01:07

Speciation Rates

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Overview
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Hybrid Zones02:29

Hybrid Zones

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Hybrid zones are narrow regions where two closely related species interact, mate, and produce hybrids. Relative to either parent species, hybrids may possess distinct phenotypic or genetic differences that impact their survival and reproductive success. The genetic variances introduced by hybridization influence species diversity and speciation processes within the hybrid zone.
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Isothermal Processes01:21

Isothermal Processes

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A thermodynamic process that occurs at constant temperature is called an isothermal process. Heat slowly flows into the system or out of the system to maintain thermal equilibrium. Processes involving phase changes like water evaporation into steam or freezing water into ice at a constant temperature are examples of Isothermal Processes.
An ideal gas can also undergo isothermal expansion or compression.
For example, consider 1 mole of an ideal gas inside an isolated cylinder at initial volume V...
3.8K
Isochoric and Isobaric Processes01:21

Isochoric and Isobaric Processes

4.2K
A thermodynamic process that occurs at constant volume is called an isochoric process. According to the first law of thermodynamics, heat supplied or removed from the system is partially utilized to perform work and change the internal energy of the system. However, in an isochoric process, the volume remains constant. Hence, the work done by the system is zero. Therefore, the exchange of heat changes the internal energy of the system only. 
Suppose 1000 g of water is heated from 40...
4.2K
Microbes and Climate Change01:27

Microbes and Climate Change

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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...
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相关实验视频

Updated: May 2, 2026

Removal of Exogenous Materials from the Outer Portion of Frozen Cores to Investigate the Ancient Biological Communities Harbored Inside
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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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凯诺纪双极冰期的值.

Robert M Deconto1, David Pollard, Paul A Wilson

  • 1Department of Geosciences, University of Massachusetts, Amherst, Massachusetts 01003, USA. deconto@geo.umass.edu

Nature
|October 4, 2008
PubMed
概括

早期的Oligocene冰川 (Oi-1) 是南极的,而不是双极的. 这一事件涉及深海的显著降温和南极冰的增长,挑战了以前关于北半球同时形成冰川的理论.

科学领域:

  • 古气候学 古气候学
  • 气候建模气候模型
  • 冰盖的动力学 冰盖的动力学

背景情况:

  • 陈代纪的冰川历史传统上认为南极冰川期约为3360万年前,其次是北半球冰川期约为310万年前.
  • 奥伊-1事件 (约33.6万年前) 显示了氧同位素的快速变化,表明冰的增长和海洋的冷却.
  • 对比深海记录和北半球证据已经提出了关于Oi-1作为双极冰川事件的问题.

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