A unit of pressure used principally in oceanography. One decibar (10' dynes/cm2) equals 0.1 bar. In the ocean, hydrostatic pressure in decibars very nearly equals the corresponding depth in meters.

An apparatus, used in studying soil temperatures, for measuring the total supply of heat during a given period.

A scale of yellows, greens, and blues for recording the color of sea water, as seen against the white background of a Secchi disk.

The standard deviation of a sufficiently large number of measurements of the same quantity by the same instrument or method. The non-correctable part of the inaccuracy of an instrument, it represents the limit of measurement precision. The uncertainty of ...

An automatic, recording cloud height indicator.

The algebraic difference between the upper and lower limits of the measuring range of an instrument, i.e. a thermometer with a range of -35 to 50

The transducer of any hygrometer, i.e. that part of a hygrometer that quantitatively "senses" atmospheric water vapor.

The effect upon the measurement of rainfall caused by the presence of the rain gauge.

See evaporative opportunity.

That portion of the record of a microbarograph between any two (or a specified small number) of successive crossings of the average pressure level (in the same direction). Analogous to microseism.

Atmospheric layer throughout which there is no change of temperature with height, i.e. a zero lapse rate.

Thermodynamic change of state of a system in which there is transfer of heat across the boundaries of the system. Compare to adiabatic process.

A form of data transmission in which the bits of each character are sent one at a time along a single communication path. Compare to parallel data transmission.

An instrument used to measure the water vapor content of the air. A type of hygrometer. It consists of a wet-bulb and a dry-bulb thermometer. See aspiration psychrometer, Assmann psychrometer. hygrodeik, sling psychrometer.

Wind with a speed between 48 and 55 knots (55 and 63 mph), Beaufort scale number 10.

Same as fogbow.

The process by which events in the real world are translated into machine-readable signals.

The pressure unit of the meter-ton-second system of physical units. equal to 10 millibars or 101 dynes per cm2.

The frequency of a carrier wave.

A sunshine recorder of the type in which the time scale is supplied by a chronograph. It consists of two bulbs, one of which is blackened, which communicate through a glass tube of small diameter. The tube is partially filled with mercury and contains two ...