在海底的小彗星
B B Cael1, Lionel Guidi2,3
1National Oceanography Centre, Southampton, UK.
Science (New York, N.Y.)
|October 10, 2024
概括
海洋雪是由有机物质组成的, 由于粘液而沉降速度较慢. 这种粘液会对海洋的生态化学循环产生重大影响.
科学领域:
- 海洋学
- 生物地质化学
- 海洋生物学
背景情况:
- 海洋雪是碳出口的重要途径.
- 海洋雪的物理特性,如聚合率和沉降率,影响了它的命运和生态影响.
- 粘液可以改变沉没粒子的特性.
研究的目的:
- 研究粘液对海雪沉降速度的影响.
- 评估海雪动态变化的潜在生态化学后果.
主要方法:
- 模拟海洋积雪和沉降的实验室实验.
- 在不同粘液度下测量下沉速度.
- 对粒子流量和碳出口进行建模.
主要成果:
- 当被粘液覆盖时,海洋积雪的沉降速度显著降低.
- 减速的程度与粘液含量成正比.
- 这种阻力效应会导致粒子在水柱中的停留时间增加.
结论:
- 海洋生物产生的粘液可以大大减缓海雪的沉降.
- 这种"粘液阻力"对海洋碳循环和营养物质运输有重大影响.
- 需要进一步的研究来量化不同海洋环境中的这种影响.
更多相关视频
相关概念视频
00:59Buoyancy
9.6K
When an object is placed in a fluid, it either floats or sinks. All objects in a fluid experience a buoyant force. For example, a metal ball sinks, while a rubber ball floats. Similarly, a submarine can sink and float by adjusting its buoyancy. The concept of buoyancy raises several interesting questions. For instance, where does this buoyant force come from? How much buoyant force is required to make an object sink or float? Do objects that sink get any support at all from the...
9.6K
03:37Subatomic Particles
91.8K
Dalton was only partially correct about the particles that make up matter. All matter is composed of atoms, and atoms are composed of three smaller subatomic particles: protons, neutrons, and electrons. These three particles account for the mass and the charge of an atom.
91.8K
01:23Surface Appendages of Archaea
2
Archaeal surface appendages are highly specialized structures essential for environmental adaptation, encompassing roles in adhesion, biofilm formation, and motility. Among these appendages, pili and archaella stand out for their distinct morphologies and functionalities, enabling archaea to thrive in diverse and often extreme environments.Pili: Adhesion and Biofilm FormationPili are filamentous structures assembled from pilin protein subunits, primarily contributing to adhesion and biofilm...
2
01:06Tidal Forces
2.5K
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...
2.5K
01:11Buoyancy and Stability for Submerged and Floating Bodies
1.4K
In fluid mechanics, buoyancy and stability are key concepts for understanding the behavior of submerged and floating bodies. When a stationary body is fully or partially submerged in a fluid, the fluid exerts a force on the body known as the buoyant force. This force acts vertically upward through a point called the center of buoyancy, which is the center of the displaced fluid volume. According to Archimedes' principle, the magnitude of the buoyant force is equal to the weight of the fluid...
1.4K
01:18Rise of Liquid in a Capillary Tube
1.5K
When very thin cylindrical tubes, called capillaries, are dipped in a liquid, the liquid rises or falls in the tube compared to the surrounding liquid. This phenomenon is called capillary action. Capillary action occurs due to the combination of two opposing forces: the cohesive forces of the liquid, which cause it to stick to itself and form a rounded shape, and the adhesive forces between the liquid and the walls of the container, which cause the liquid to be attracted to the container walls.
1.5K