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Global Climate Change01:50

Global 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.
Isothermal Processes01:21

Isothermal Processes

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...
Conservation of Declining Populations02:07

Conservation of Declining Populations

Conservation of declining population focuses on ways of detecting, diagnosing, and halting a population decline. The approach uses methods to prevent populations from going extinct.
Speciation Rates01:07

Speciation Rates

Speciation can proceed at markedly different rates, and evolutionary biologists commonly describe these differences through the models of gradualism and punctuated equilibrium. Both patterns explain how new species arise, but they differ in the tempo and continuity of evolutionary change. In both cases, evolutionary change arises from heritable variation within populations, with natural selection often shaping traits that improve survival and reproduction under specific environmental conditions.
The Fossil Record02:56

The Fossil Record

The fossil record documents only a small fraction of all organisms that have ever inhabited Earth. Fossilization is a rare process, and most organisms never become fossils. Moreover, the fossil record only exhibits fossils that have been discovered. Nevertheless, sedimentary rock fossils of long-lived, abundant, hard-bodied organisms dominate the fossil record. These fossils offer valuable information, such as an organism's physical form, behavior, and age. Studying the fossil record helps...
Threats to Biodiversity01:50

Threats 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...

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Using Generative Art to Convey Past and Future Climate Transitions
06:10

Using Generative Art to Convey Past and Future Climate Transitions

Published on: March 31, 2023

最後の氷河期最大期である.

Peter U Clark1, Arthur S Dyke, Jeremy D Shakun

  • 1Department of Geosciences, Oregon State University, Corvallis, OR 97331, USA. clarkp@onid.orst.edu

Science (New York, N.Y.)
|August 8, 2009
PubMed
まとめ
この要約は機械生成です。

最後の氷河期最大 (Last Glacial Maximum,LGM) は,気候変動によって引き起こされた3万3000年から1万9千年前の出来事です. 脱氷は約19,000年前に始まり,海面上昇につながった.

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Laser-Induced Fluorescence Emission (L.I.F.E.) as Novel Non-Invasive Tool for In-Situ Measurements of Biomarkers in Cryospheric Habitats
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Laser-Induced Fluorescence Emission (L.I.F.E.) as Novel Non-Invasive Tool for In-Situ Measurements of Biomarkers in Cryospheric Habitats

Published on: October 26, 2019

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09:06

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Laser-Induced Fluorescence Emission (L.I.F.E.) as Novel Non-Invasive Tool for In-Situ Measurements of Biomarkers in Cryospheric Habitats
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Laser-Induced Fluorescence Emission (L.I.F.E.) as Novel Non-Invasive Tool for In-Situ Measurements of Biomarkers in Cryospheric Habitats

Published on: October 26, 2019

科学分野:

  • 古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは
  • 四次地質学 四次地質学
  • 氷河学 氷河学とは

背景:

  • 最後の氷河期最大 (Last Glacial Maximum,LGM) のタイミングと範囲は,過去の気候の動態と氷床の振る舞いを理解するために極めて重要です.
  • 以前の研究では,LGMのタイミングの推定値が提供されていましたが,大規模なデータセットを使用した包括的な合成が必要です.

研究 の 目的:

  • ジオクロノロジカルデータの大規模な収集を使用して,LGMとそれに続く脱氷のタイミングを正確に制限します.
  • LGMにおける気候強制と氷床の広がりとの関係を調査する.

主な方法:

  • 5704の放射性炭素 (14C),ベリリウム-10 (10Be),ヘリウム-3 (3He) 年代を分析した.
  • デッティングの区間は1万年から5万年前 (10-50 ka) に及ぶ.

主要な成果:

  • 氷床は,北部の夏の日照が減り,太平洋の海面の温度が下がり,大気中のCO2が下がり,33~26.5kaの間に最大幅に達した.
  • 氷床は,LGMの位置の近くに26.5から19-20ka.まで留まった.
  • 北半球の脱氷は19~20ka頃に始まり,北半球の夏の日照が増加し,海面が上昇した.
  • 西南極の氷床の脱氷は14~15kaの間に始まり,海面の上昇を14.5kaほど大きく促した.

結論:

  • LGMは,氷床の成長,安定,崩壊の明確な段階を持つダイナミックな時期でした.
  • 気候の強制作用,特に日照の変化は,LGMと脱氷のタイミングを推進する上で重要な役割を果たしました.
  • この研究は,LGMと脱氷のタイムラインを洗練し,強制への地球の気候システム反応の理解を向上させます.