物理海洋学名词-V 451

Glossary of Physical Oceanography and Related Disciplines

Steven K. Baum Department of Oceanography Texas A&M University

May 26, 2004

 

Visayan Sea A small sea located in the midst of the Visayan Islands that comprise the central portion of the Philippines. It is centered at about 124◦E and 12◦N and connected to the Sibuyan Sea to the northwest, the Samar Sea to the northeast, the the Camotes Sea to the southeast, the Bohol Sea to the southwest via the Tanon Strait, and to the Panay Gulf to the southwest via the Guimaras Strait. Prominent geographic features include the Asid Gulf (in Masbate Island) and Bantayan Island.


viscous sublayer That part of a boundary layer where the viscous stress is much larger than the Reynolds stress. See Kagan [1995].


Vivaldi A synoptic hydrographic survey carried out in the northeast North Atlantic in 1991. The details are supplied by Pollard et al. [1991]:
During the six week period from 27 April to 8 June 1991, a survey of the northeast North Atlantic was carried out on the RRS Charles Darwin with CTD and SeaSoar between 39◦N and 54◦N and between 12◦W and 34◦W. Full depth CTD casts were made with a Neil Brown Mark 3 CTD at 32 positions sparsely spaced on a 3◦ (latitude) by 300 km (longitude) grid.
See Pollard et al. [1991].


VMCM See Vector Measuring Current Meter.


volumetric analysis A technique for the analysis of water masses wherein the volume of each water type or mass is ascertained. One use of this technique is to quantitatively examine changes in the character of the water in a region in the interval between surveys, although the spatial and temporal resolution of sampling in most areas has thus far made this a promising rather than a realized technique.
The procedure for performing a volumetric T–S or θ–S involves: (1) preparing a suitable data set, preferably one composed of relatively closely spaced hydrographic stations consisting of surface–to–bottom data with all coverage within a single season; (2) determining the area represented by each station; (3) partitioning the temperature and salinity fields into an array of T–S classes; (4) determining the depth interval within each T–S class; (5) multiplying the depth intervals by the area represented by each station to obtain the volumes of each class; and (6) summing these volumes over the desired region. See Swift [1986].


von Humboldt, Alexander (1769–1859) See Peterson et al. [1996], p. 64.


von Lenz, Emil (1804–1865) See Peterson et al. [1996], p. 64.


von Waitz, Jacob (1698–1776) See Peterson et al. [1996], p. 47.


vortex stretching Later.


vorticity A fluid property defined as twice the local rate of rotation of a fluid element or the curl of the velocity field, i.e.
ω = ▽× u
where u is the velocity vector. In a rotating frame of reference like the earth, there is additionally a quantity known as the planetary vorticity, i.e.
2Ω = ▽× U
where U = Ω × u is the velocity of the rotating frame at position x. Together these comprise the absolute vorticity, i.e.
ω^a= 2Ω + ω.

It is a three-dimensional property of the field of motion of a fluid, although in large-scale geophysical fluid dynamics the vorticity component in the horizontal plane (i.e. rotation about the vertical axis) is usually the only non-negligible component. The vorticity equation governs the evolution of vorticity in a geophysical fluid.

 

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