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Related Concept Videos

Damped Oscillations01:07

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In the real world, oscillations seldom follow true simple harmonic motion. A system that continues its motion indefinitely without losing its amplitude is termed undamped. However, friction of some sort usually dampens the motion, so it fades away or needs more force to continue. For example, a guitar string stops oscillating a few seconds after being plucked. Similarly, one must continually push a swing to keep a child swinging on a playground.
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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.
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Magnetostatic Boundary Conditions01:28

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An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
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If the amount of damping in a system is gradually increased, the period and frequency start to become affected because damping opposes, and hence slows, the back and forth motion (the net force is smaller in both directions). If there is a very large amount of damping, the system does not even oscillate; instead, it slowly moves toward equilibrium. In brief, an overdamped system moves slowly towards equilibrium, whereas an underdamped system moves quickly to equilibrium but will oscillate about...
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Stability is an important concept in oscillation. If an equilibrium point is stable, a slight disturbance of an object that is initially at the stable equilibrium point will cause the object to oscillate around that point. For an unstable equilibrium point, if the object is disturbed slightly, it will not return to the equilibrium point. There are three conditions for equilibrium points—stable, unstable, and half-stable. A half-stable equilibrium point is also unstable, but is named so...
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Comment on "The Atlantic Multidecadal Oscillation without a role for ocean circulation".

Rong Zhang1, Rowan Sutton2, Gokhan Danabasoglu3

  • 1National Oceanic and Atmospheric Administration, Geophysical Fluid Dynamics Laboratory, Princeton, NJ, USA. rong.zhang@noaa.gov.

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Ocean dynamics are central to the Atlantic Multidecadal Oscillation (AMO). Our findings challenge the view that the AMO is solely a thermodynamic response to atmospheric changes, highlighting the critical role of ocean circulation.

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Area of Science:

  • Oceanography
  • Climate Science
  • Atmospheric Science

Background:

  • The Atlantic Multidecadal Oscillation (AMO) is a significant mode of climate variability.
  • Previous research suggested the AMO is a thermodynamic response to atmospheric forcing.

Discussion:

  • This study refutes the claim that ocean circulation changes do not influence the AMO.
  • We demonstrate that ocean dynamics are fundamental to the AMO's behavior.

Key Insights:

  • Ocean dynamics, not just atmospheric forcing, are a primary driver of the AMO.
  • The AMO is not purely a thermodynamic response of the ocean mixed layer.

Outlook:

  • Further research into ocean-atmosphere interactions is needed to fully understand the AMO.
  • Incorporating ocean dynamics into climate models is crucial for accurate AMO prediction.