从潮到沿着夏威夷山脊的混合
Daniel L Rudnick1, Timothy J Boyd, Russell E Brainard
1Scripps Institution of Oceanography, La Jolla, CA 92093-0213, USA. drudnick@ucsd.edu
Science (New York, N.Y.)
|July 19, 2003
概括
潮能量为沿夏威夷山脊的海洋动荡提供燃料,大型内部潮波显著增加了动荡的消散. 这项研究证实潮流作为海洋混合的关键途径.
科学领域:
- 海洋学 海洋学 海洋学
- 流体动力学 流体动力学
- 地质物理学 地质物理学
背景情况:
- 海洋混合对于调节气候和海洋生态系统至关重要.
- 从潮到流的布是推动海洋混合的能量转移的假设途径.
- 了解这种能量通路对于准确的气候和海洋学模型至关重要.
研究的目的:
- 为了研究沿着夏威夷山脊推测的潮到流的能量级.
- 量化内部潮和随后的流在该地区海洋混合中的作用.
主要方法:
- 利用沿夏威夷山脊收集的观测数据.
- 采用数值模型来模拟内部潮动态和能量流.
- 与公海值相比,分析了流散射率.
主要成果:
- 观察到山脊内部的潮能量流的分歧,与模型预测一致.
- 记录了大规模的内部潮波,幅度高达300米.
- 发现山脊附近的流散射率是公海的10倍.
结论:
- 夏威夷山脊是潮到动荡的能量级的一个重要地点.
- 内部潮在产生增强的流和海洋混合方面发挥着至关重要的作用.
- 这个布的能源预算接近结束,验证了假设的路径.
相关概念视频
01:34Crossing Over
Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process called synapsis.
In order to...
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process called synapsis.
In order to...
01:34Crossing over
Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process called synapsis.
In order to...
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process called synapsis.
In order to...
01:04Travelling Waves
A wave is a disturbance that propagates from its source, repeating itself periodically, and is typically associated with simple harmonic motion. Mechanical waves are governed by Newton's laws and require a medium to travel. A medium is a substance in which a mechanical wave propagates, and the medium produces an elastic restoring force when it is deformed.
Water waves, sound waves, and seismic waves are some examples of mechanical waves. For water waves, the wave propagation medium is water;...
Water waves, sound waves, and seismic waves are some examples of mechanical waves. For water waves, the wave propagation medium is water;...
01:25Rab Cascades
Rab GTPases act in a regulated cascade during membrane fusion, helping the lipid bilayers mix. The Rab family of proteins are active when bound to GTP, and inactive when bound to GDP. Hence, they act as guanine nucleotide-dependent molecular switches. Rab-GTP recognizes and binds to long or short-range tethering proteins to capture the target vesicle. These tethers coordinate with SNAREs on the vesicle and the target membrane to assemble the trans SNARE complex that locks the mixing bilayers.
01:22Level Curves and Contour Maps
Level curves and contour maps provide a way to visualize functions of two variables on a two-dimensional plane. A useful example is a topographic map, where curved lines represent locations that share the same elevation. In mathematics, these curves are called level curves or contour lines. Each contour line corresponds to points in the domain where the function has a constant value. For a function of two variables written as z = f(x,y), a level curve is defined by the equation f(x,y) = k,...
01:31Tangent Planes to Level Surfaces
A level surface consists of all points in space where a function of three variables takes the same fixed value. If a point lies on this surface, understanding the surface’s geometry there requires more than just knowing the point’s coordinates; it requires describing how the surface is oriented, or how it tilts, near that point.To probe this local geometry, imagine tracing a path that stays entirely on the level surface and passes through the point of interest. This path can be described as a...