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相关概念视频

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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相关实验视频

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

在过去35,000年的海平面.

J D Milliman, K O Emery

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

    这项研究呈现了过去35,000年美国大西洋架的海平面曲线. 它揭示了海平面的大幅下降,随后在全新纪的过渡期间迅速上升.

    科学领域:

    • 地质地质地质地质地质地
    • 古代海洋学 古代海洋学
    • 四分学科学 四分学科学

    背景情况:

    • 重建过去的海平面对于理解地球气候动态至关重要.
    • 美国大西洋大陆架提供了关于海平面变化的宝贵记录.

    研究的目的:

    • 为了建立一个详细的海平面曲线为美国大西洋大陆架跨越过去35,000年.
    • 为了将该区域曲线与全球海平面数据进行比较.

    主要方法:

    • 使用了来自各种浅水材料的80多个放射性碳日期.
    • 包括软体动物,卵石,珊瑚藻类,沙岩和盐沼泥炭的年代.
    • 分析了数据,构建了从35,000年前到现在的海平面曲线.

    主要成果:

    • 海平面在3万到3万5千年前接近现在的水平.
    • 16000年前,由于冰川的增长,海平面下降到大约130米.
    • 全新纪的转变开始于大约14000年前,并加速到7000年前.

    结论:

    • 美国大西洋架的海平面曲线与全球数据一致.

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  • 研究结果表明,该曲线接近于分析期间的静态海平面曲线.