Hugtakasafn þýðingamiðstöðvar utanríkisráðuneytisins
Hugtakasafn : Eitt hugtak
- ÍSLENSKA
- neðansjávarhver
- ENSKA
- hydrothermal vent
- Svið
- sjávarútvegur
- Dæmi
- [is] væntanlegt
- [en] The Community is committed to the conservation of marine ecosystems such as reefs, seamounts, deep water corals, hydrothermal vents and sponge beds.
- Skilgreining
- [en] Hydrothermal vents are localized discharges of heated seawater. They result from cold seawater percolating down into the hot oceanic crust through the zone of fissures and returning to the seafloor in a pipelike flow at the axis of the neovolcanic zone... Exotic biological communities exist around the hydrothermal vents. These ecosystems are totally independent of energy from the Sun. They are not dependent on photosynthesis but rather on chemosynthesis by sulphur-fixing bacteria. (IATE, úr Encyclop. Brit.) A hydrothermal vent is a geyser on the seafloor. It continuously spews super-hot, mineral-rich water that helps support a diverse community of organisms. Although most of the deep sea is sparsely populated, vent sites teem with a fascinating array of life. Tubeworms and huge clams are the most distinctive inhabitants of Pacific Ocean vent sites, while eyeless shrimp are found only at vents in the Atlantic Ocean. Chimneys top some hydrothermal vents. These smokestacks are formed from dissolved metals that precipitate out (form into particles) when the super-hot vent water meets the surrounding deep ocean water, which is only a few degrees above freezing.
So-called "black smokers" are the hottest of the vents. They spew mostly iron and sulfide, which combine to form iron monosulfide. This compound gives the smoker its black color.
"White smokers" release water that is cooler than their cousins'' and often contains compounds of barium, calcium, and silicon, which are white. (http://www.ceoe.udel.edu/deepsea/level-2/geology/vents.html) - Rit
- v.
- Skjal nr.
- 32008R0734
- Athugasemd
- ,Hydrothermal vent´ er svæði þar sem heitt vatn stígur upp af sjávarbotni. Það er álitamál hvort rétt sé að kalla þetta ,hver´, því að á þessum uppstreymissvæðum er sjaldan eða aldrei um gos að ræða eins og í hverum, heldur er uppstreymið yfirleitt jafnt og stöðugt. Við þessi ,augu´ hlaðast oft upp strýtur úr efni sem fellur út úr heita vatninu og þær nefnast hverastrýtur (e. smokers).
- Orðflokkur
- no.
- Kyn
- kk.
Takk fyrir
Ábendingin verður notuð til að bæta gæði þjónustu og upplýsinga á vef Stjórnarráðsins. Hikaðu ekki við að hafa samband ef þig vantar aðstoð.