Meteorology

Meteorology

A database of terms pertaining to the scientific study of the atmosphere.

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Meteorology

Nondimensional parameter

Weather; Meteorology

Parameter of a problem with a value that is independent of the units of measurement. See nondimensional equation, dimensional analysis.

1. Any function, often of time but possibly of any variable, with a substantial lack of correlation between values at successive times. For example, the autocorrelation function of white noise is a ...

Node

Weather; Meteorology

One of the two points of intersection of the orbit of a satellite with the plane of the equator of the earth. The ascending node of equatorial crossing refers to that point on the plane of the ...

Nodal period

Weather; Meteorology

The time that elapses between successive passages of a satellite through successive ascending nodes.

Nodal increment

Weather; Meteorology

The difference in degrees longitude between successive ascending nodes of a satellite in polar orbit. It is the amount of turning of the earth under the satellite, measured in degrees longitude, that ...

Nonmethane hydrocarbons (NMHCs)

Weather; Meteorology

Collectively, all the hydrocarbons other than methane. Methane is fairly long-lived in the atmosphere and has a large and relatively constant mixing ratio in the troposphere. The other hydrocarbons ...

Nonlocal mixing

Weather; Meteorology

The vertical movement and intermingling of fluid from all possible source locations (neighboring and nonneighboring), to produce a mixture at some other location. The fraction of air mixing into each ...