Not a linear function of the relevant variables.

The audio-frequency signal transmitted by the Diamond-Hinman radiosonde when the baroswitch pen passes each fifteenth contact of the commutator, up to a number determined by the design of the commutator, and each fifth contact thereafter. This signal is t ...

Liquid water at temperatures colder than freezing.

The correctable part of the inaccuracy of an instrument.

An inert gas. A colorless, monatomic element which is found to occur in dry air to the extent of only 0.000524 percent by volume. Helium is very light, having a molecular weight of only 4.003 and specific gravity referred to air of 0.138. Because helium i ...

meter-An instrument for measuring the transmissivity of the atmosphere; a type of transmissometer. It consists of a constant- intensity collimated light source located at a suitable distance from a photoelectric cell. Variation in the turbidity of the atm ...

Pertaining to the action or effect of the wind. Derived from the name of the Greek god of the winds, Aeolus.

The distance or length of flow of the air past a point during a given interval of time.

Water vapor content of the air. See absolute humidity, dew point, mixing ratio, relative humidity, specific humidity.

An instrument designed to record the duration of sunshine at a given location without regard to intensity. See Campbell- Stokes recorder, Jordan sunshine recorder, Marvin sunshine recorder, Pers sunshine recorder.

The level at which ice crystals and snowflakes melt as they descend through the atmosphere.

Solar and terrestrial radiation directed downwards (towards the earth's surface); incoming radiation.

In general, solar radiation received at the earth's surface. Contracted from incoming solar radiation.

Infrared radiation emitted by or being propagated through the atmosphere.

Pyrheliometer based on the comparison of the heating of two identical metal strips, one exposed to radiation, the other to a joule effect.

See photometer.

A standard interface between a computer input/output port and a peripheral device. Signal properties including time duration, voltage. and current, are specified by the Electronic Industries Association.

Sir Napier Shaw's name for the approximate absolute temperature scale,

Technically, the temperature registered by the dry-bulb thermometer of a psychrometer. However, it is identical with the temperature of the air and may also be used in that sense.

Same as mercury barometer.