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Lagrangian current measurementIn oceanography, a current measurement obtained from the determination of the position of a drifter at certain time intervals, so that the mean velocity over that interval can be calculated.
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Lagrangian equations of motionDifferential equations that determine the evolution of a general dynamical system. These are derived using the calculus of variations to minimize the Lagrangian functional equivalent to the time integral of the difference between the kinetic and potential energies with respect to variations in the evolution of the system.
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Lagrangian equationsAny of the fundamental equations of hydrodynamics expressed in Lagrangian coordinates. In the Lagrangian description, the independent variables are time and a set of particle labels (such as the initial position of each particle). Although the Lagrangian description is employed less frequently than the Eulerian description, it can be particularly useful in combined chemistry/ dynamics problems such as stratosphere/troposphere exchange along isentropic surfaces that intersect the tropopause.
Salmon, R., 1998: Lectures on Geophysical Fluid Dynamics, Oxford University Press, 5–6.
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Lagrangian hydrodynamic equationsHydrodynamic equations of motion, using coordinates of fluid particles as the dependent variables. The independent variables are time and coordinates representing the fluid particles themselves, for example, their positions at time t = 0.
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Lagrangian mean currentThe current determined by dividing the displacement of a fluid particle by the time traveled.
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Lagrangian timescaleThe mean time for an air parcel to be displaced from one location to another.
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laheimarSevere squalls during the change of seasons in October and November in Arabia.
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