Automatic Tide Gauge: An instrument that automatically registers the rise and fall of the water level. In some instruments, the registration is accomplished by recording the heights at regular time intervals in digital format; in others, by a continuous graph of height against time.

 

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Automatic Tide Gauge: An instrument that automatically registers the rise and fall of the water level. In some instruments, the registration is accomplished by recording the heights at regular time intervals in d . . . View Full Definition

Tide Gauge: An instrument for measuring the rise and fall of the tide (water level). See ADR gauge, automatic tide gauge, Next Generation Water Level Measurement System, gas purged pressure gauge, elect . . . View Full Definition

Primary Control Tide Station: A tide station at which continuous observations have been made over a minimum of 19 years. Its purpose is to provide data for computing accepted values of the harmonic and non-harmonic const . . . View Full Definition

Pressure Gauge: A water level gauge that is operated by the change in pressure at the bottom of a body of water due to the rise and fall of the water level. See gas purged pressure gauge.

Polypeptide: A protein or part of a protein made of a chain of amino acids joined by a peptide bond.

Perigean Tides Or Tidal Currents: Tides of increased range or tidal currents of increased speed occurring monthly as the result of the Moon being in perigee. The perigean range (Pn) of tide is the average range occurring at . . . View Full Definition

Polynucleotides: Long chains of nucleotides formed by chemical links between the sugar and phosphate groups.

Priming Of Tide: The periodic acceleration in the time of occurrence of high and low waters due to changes in the relative positions of the Sun and Moon.

Rain Gauge: An instrument used to measure the amount of rain that has fallen. Measurement is done in hundredths of inches (0.01').

Red Tides: Phenomenon associated with population explosions (blooms) of certain types of dinoflagellates; red structures inside the dinoflagellates cause the water to have a reddish color.