- 行业: Earth science
- Number of terms: 10770
- Number of blossaries: 1
- Company Profile:
The UK charity dedicated to the protection of the marine environment and its wildlife.
An inter-governmental organisation concerned with marine and fish science.
Industry:Earth science
A strong water-surface current of short duration flowing seaward from the shore; the return movement of water piled up on the shore by incoming waves and wind. It usually appears as a visible band of agitated water; and, with the outward movement concentrated in a limited band, its velocity is somewhat accentuated. A rip current is often miscalled a ``rip tide. '' To swimmers, the phenomenon is known as ``undertow. ''
Industry:Earth science
An instability due to the buoyancy force of heavy fluid over light fluid overcoming the stabilizing influence of viscous forces.
Industry:Earth science
A seamount is a mountain rising from the ocean seafloor that does not reach to the water's surface (sea level), and thus is not an island. These are typically formed from extinct volcanoes, that rise abruptly and are usually found rising from a seafloor of 1,000–4,000 metres (3,281–13,123 ft) depth. They are defined by oceanographers as independent features that rise to at least 1,000 metres (3,281 ft) above the seafloor.
Industry:Earth science
A form of geophysical survey which uses an acoustic imaging device used to provide wide area, high resolution pictures of the seabed. The instrument towed behind the vessel transmits acoustic signals obliquely through the water and displays the returning echoes via an onboard graphic recorder, providing a depiction of what lies either side of the vessel.
Industry:Earth science
A sudden acidification of runoff waters from the spring melting of accumulated snow in the middle latitudes because of the winter deposition of acidic precipitation.
Industry:Earth science
A seasonal, eastward-flowing ocean current of the Indian Ocean. The monsoon current replaces the north equatorial current and the equatorial counter-current in summer (Northern Hemisphere), when the southwest monsoon forms a continuation of the southeast trade winds.
Industry:Earth science
A north-south reference line, particularly a great circle through a planet's geographical poles. A terrestrial meridian is a line on Earth's surface that connects points having the same astronomical longitude -- also called astronomical meridian. A geodetic meridian is a line connecting points of equal geodetic longitude. Geodetic and sometimes astronomical meridians are also called geographic meridians. Geodetic meridians are shown on charts. The prime meridian passes through longitude 0°. A fictitious meridian is one of a series of great circles or lines used in place of a meridian for certain purposes. A transverse or inverse meridian is a great circle perpendicular to a transverse equator. An oblique meridian is a great circle perpendicular to an oblique equator. Any meridian used as a reference for reckoning time is called a time meridian. The meridian through any particular place or observer, serving as the reference for local time, is called local meridian, in contrast with the Greenwich meridian, the reference for Greenwich time. A celestial sphere, through the celestial poles and the zenith.
Industry:Earth science
A current flowing adjacent to another current both in the opposite direction.
Industry:Earth science
Una linea di riferimento nord-sud, particolarmente un grande cerchio attraverso poli geografici del pianeta. Un meridiano terrestre è una linea sulla superficie della terra che collega i punti aventi la stessa longitudine astronomica - chiamata anche meridiano astronomico. Un meridiano geodetic è una linea che collega i punti di uguale longitudine geodetica. A volte astronomiche e geodetiche meridiani sono anche chiamati meridiani geografici. Meridiani geodetici sono mostrati nelle classifiche. Il primo meridiano passa attraverso longitudine 0°. Un meridiano fittizio è uno di una serie di linee utilizzati al posto di un meridiano per determinati scopi o cerchi grandi. Un meridiano trasverso o inverso è un cerchio massimo perpendicolare a un equatore trasversale. Un meridiano obliquo è un cerchio massimo perpendicolare ad un equatore obliquo. Ogni meridiano utilizzato come riferimento per il computo di tempo è chiamato un meridiano del tempo. Il meridiano attraverso qualsiasi luogo particolare o l'osservatore, che serve come riferimento per ora locale, è chiamato meridiano locale, in contrasto con il meridiano di Greenwich, il riferimento per il tempo di Greenwich. Una sfera celeste, attraverso i poli celesti e lo Zenit.
Industry:Earth science
