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関連する概念動画

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.
Deep Sea Microbial Ecology01:18

Deep Sea Microbial Ecology

The deep ocean and its underlying sediments represent vast, largely unexplored microbial habitats that extend far beyond the sunlit photic zone. The photic (euphotic) zone typically spans the upper ~100–200 meters of pelagic waters in the open ocean, but its depth varies geographically and seasonally, where sufficient light supports photosynthetic life. Below this lies the deep sea, spanning roughly 1000–6000 meters (bathypelagic to abyssal zones), with deeper hadal trenches extending beyond...
Influence of Earth's Curvature and Atmospheric Refraction on Leveling01:26

Influence of Earth's Curvature and Atmospheric Refraction on Leveling

During leveling, the Earth's curvature and atmospheric refraction introduce deviations in the line of sight from a true horizontal reference. When the line of sight is leveled, it remains perpendicular to the plumb line only at a single point. Beyond this, it deviates due to the Earth’s curvature, represented by the correction C. For a sight distance D, the deviation can be derived using the relationship:This relationship shows that the deviation increases quadratically with distance. Over a...
Tidal Forces01:06

Tidal Forces

The origin of Earth's ocean tides has been a subject of continuous investigation for over 2000 years. However, the work of Newton is considered to be the beginning of the proper understanding of the phenomenon. Ocean tides are the result of gravitational tidal forces. These same tidal forces are present in any astronomical body; they are responsible for the internal heat that creates the volcanic activity on Io, one of Jupiter's moons, and the breakup of stars that get too close to black holes.
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...
What is Evolutionary History?02:35

What is Evolutionary History?

Scientists record evolutionary history by analyzing fossil, morphological, and genetic data. The fossil record documents the history of life on Earth and provides evidence for evolution. However, both fossil and living organisms offer evidence that outlines Earth’s evolutionary history.Phylogenetic trees illustrate the evolutionary relationships among these organisms. Scientists infer organisms’ common ancestry by evaluating shared morphological and genetic characteristics. Together, the fossil...

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関連する実験動画

Updated: Jul 12, 2026

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

過去3万5千年の海面上昇

J D Milliman, K O Emery

    Science (New York, N.Y.)
    |December 6, 1968
    PubMed
    まとめ

    この研究は,過去3万5千年にわたるアメリカ大西洋岸の海平面曲線を示しています. これは,ホロセーン時代の超越期間に海面が著しく低下し,その後急激に上昇したことを示しています.

    科学分野:

    • 地質学 地質学 地質学
    • パレオセアノグラフィー
    • 四次科学とは四次科学である.

    背景:

    • 過去の海面の再構築は,地球の気候の動態を理解するために不可欠です.
    • アメリカ合衆国の大西洋大陸棚は,海面変化の貴重な記録を提供している.

    研究 の 目的:

    • 過去3万5千年にわたる米国大西洋大陸棚の詳細な海面曲線を確立するために.
    • この地域曲線を世界の海面データと比較する.

    主な方法:

    • 80以上の放射性炭素年代測定を用いて,様々な浅水材料から採取した.
    • 軟体類,オオライト,サンゴ藻類,ビーチロック,塩沼泥炭の年代測定を含みます.
    • 3万5千年前から現在までの海平面の曲線を構築するためにデータを分析した.

    主要な成果:

    • 海水位は3万~3万5千年前には現在の水準に近いものでした.
    • 海水位は,氷河の成長のために16,000年前に約130メートルまで下がりました.
    • ホロケーン時代の超越は,約14,000年前に始まり,7,000年前まで加速しました.

    結論:

    さらに関連する動画

    Visualizing Oceanographic Data to Depict Long-term Changes in Phytoplankton
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    Visualizing Oceanographic Data to Depict Long-term Changes in Phytoplankton

    Published on: July 28, 2023

    Investigating the Relationship between Sea Surface Chlorophyll and Major Features of the South China Sea with Satellite Information
    10:28

    Investigating the Relationship between Sea Surface Chlorophyll and Major Features of the South China Sea with Satellite Information

    Published on: June 13, 2020

    関連する実験動画

    Last Updated: Jul 12, 2026

    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

    Visualizing Oceanographic Data to Depict Long-term Changes in Phytoplankton
    08:15

    Visualizing Oceanographic Data to Depict Long-term Changes in Phytoplankton

    Published on: July 28, 2023

    Investigating the Relationship between Sea Surface Chlorophyll and Major Features of the South China Sea with Satellite Information
    10:28

    Investigating the Relationship between Sea Surface Chlorophyll and Major Features of the South China Sea with Satellite Information

    Published on: June 13, 2020

    • アメリカ大西洋のシェルフで開発された海平面曲線は,世界のデータと一致しています.
    • この曲線は,分析期間におけるユースタティック海平面曲線に近似していることを示唆している.