311
Sverdrup relation
the surface microlayer may influence the surface tension. Also the effect of
decreasing surface tension of the sea surface on sea birds can be mentioned:
at lower values seawater penetrates the fine meshwork of insulating feathers,
decreasing the air retention and causing loss of insulation, ultimately lethal
to the birds. -7surface films.
surf zone -7lonation.
surge (1) rise of the sea level above the normal tide. In the case of a large, often
devastating surge caused by atmospheric forces one speaks of a storm surge.
Surges may also have an earthquake or an explosion as their origin
(-7tsunami); (2) the sudden, very rapid flow of a glacier. During a surge a
large volume of ice from an ice reservoir area is displaced downstream at
speeds of up to several meters per hour. In the interval between surges, the
ice reservoir is slowly replenished by accumulation and normal ice flow.
survivorship curve used in population biology. When a cohort (an age class in a
population) is followed through time and the numbers of survivors are
counted regularly, such data are compiled in a life table and the number of
survivors can be plotted (usually logarithmically) against time, giving a survivorship curve (or mortality curve). Useful in the comparison of populations
of a species in different areas.
suspended matter all particles that occur in suspension in the water column,
both organic (living and dead) and inorganic. Usually defined as material
left on a 0.45 Ilm pore-size filter. Contains the food of suspension feeders
( -7filterfeeders).
suspended particles -7suspended matter.
suspension feeders -7filter feeders.
suspension load total of sedimentary material that remains in suspension (i.e.,
afloat). Often expressed as weight or volume per unit of time.
Sverdrup unit (sometimes used) for volume transport in sea currents, named
after the Norwegian oceanographer H. V. Sverdrup (1888-1957). One
Sverdrup equals 106 m3 S-I.
Sverdrup relation from the balance of vorticity it follows that for water moving to
the north or south the change in planetary vorticity should be compensated. For the overall balance it is required that this balance should come from
the mean curl of the wind stress. This balance is called the Sverdrup relation.
Précédent

- 321/368

Suivant