北極海における内部波束によって引き起こされる氷の屈曲

P V Czipott, M D Levine, C A Paulson

Science (New York, N.Y.)

|November 8, 1991

まとめ

北極海の内部波は,傾き計とストレインメーターで測定された氷の重要な屈曲を引き起こしました. この研究では,氷の量を定量化しています.

科学分野:

海洋学海洋学海洋学
アークティック・リサーチ・アークティック研究
地質物理学地質物理学とは地質物理学です.

背景:

内部波は,海洋の混合とエネルギー伝達の重要な原動力である.
北極海氷のダイナミクスは,気候の調節に極めて重要です.
イエルマック高原の近くで,昼間の内部穴が観察されています.

研究の目的:

北極海氷の屈曲を測定するために.
内部波が海氷に与える影響を定量化するために.
氷の屈曲と波の特徴を相関させるため.

主な方法:

北極海氷の傾斜計とストレインメーターの配置.
氷の傾き,張力,垂直速度,表面の移動を測定する.
氷の測定値と地下ピコノクリンの移動と現在のデータを比較する.

主要な成果:

36マイクロラジアンの振動的な氷の傾きが記録されました.
この傾きは,表面の垂直速度16ミクロメートル/秒と3.5ミリメートルの表面移位に対応した.
3 x 10(-7) の氷の圧力が測定され,波の圧迫に一致する屈曲が示されています.

結論:

活力のある内部波は,北極海氷の測定可能な屈曲を引き起こす可能性があります.
観測された氷の屈曲は,内部穴の動力学と一致しています.
この研究は,内部波と海氷との相互作用の直接的な証拠を提供します.

さらに関連する動画

07:28

Evolution of Staircase Structures in Diffusive Convection

Published on: September 5, 2018

11:25

A Millimeter Scale Flexural Testing System for Measuring the Mechanical Properties of Marine Sponge Spicules

Published on: October 11, 2017

関連する概念動画

01:23

Coriolis Force

An accelerating particle experiences a force equal to the mass multiplied by the acceleration in an inertial frame of reference. Consider a particle in a non-inertial frame of reference, such as a sliding ball on a rotating table. The acceleration of the ball in this rotating reference frame is different than in the intertial frame, which modifies its equation of motion. The fictitious forces acting additionally on a rotating frame of reference alter Newton's Second Law expression. Centripetal...

01:16

Flexural Stress

When analyzing bending in symmetric members, it's crucial to understand how stresses distribute when subjected to bending moments. This stress distribution is effectively described by applying fundamental mechanics and material science principles, particularly Hooke's Law for elastic materials.
Hooke's Law states that within the material's elastic limits, stress is directly proportional to strain. In a member experiencing a bending moment, the strain at any point is relative to its distance...

01:06

Forced Oscillations

When an oscillator is forced with a periodic driving force, the motion may seem chaotic. The motions of such oscillators are known as transients. After the transients die out, the oscillator reaches a steady state, where the motion is periodic, and the displacement is determined.

01:20

Elastic Strain Energy for Shearing Stresses

As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...

01:04

Hydrostatic Pressure Force on a Curved Surface

Hydrostatic pressure on curved surfaces is a fundamental concept in fluid mechanics with broad applications in the civil engineering field. When fluid is in contact with a curved surface, as in a reservoir, dam, or storage tank, it exerts pressure that varies in magnitude and direction along the curved surface. To assess the total hydrostatic force exerted by the fluid on a curved structure, engineers typically isolate the fluid volume adjacent to the surface and analyze the forces acting on...

01:13

Angle of Twist - Elastic Range

Consider a cylindrical shaft with a length denoted by L and a consistent cross-sectional radius referred to as r. This shaft undergoes a torque at the free end. The highest shearing strain within the shaft is directly proportional to the twist angle and the radial distance from the shaft axis. When the shaft behaves elastically, this shearing strain can be articulated using variables such as the applied torque, radial distance, the polar moment of inertia, and the modulus of rigidity. By...

関連する実験動画