物理海洋学名词-B 72

Glossary of Physical Oceanography and Related Disciplines

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

May 26, 2004

 

Brunt-Vaisala frequency See buoyancy frequency.
BSA Abbreviation for Bayesian signal analysis, a method designed to be optimal for analyzing short time series which can work with an SNR as low as 0.6. No hypotheses are made about the actual series belonging to any hypothetical ensemble or infinite series; only the given data are used to find the probability of some a priori signal being contained in the data. A measure of the accuracy of the estimate can also be obtained. See Ruiz de Elvira and Bevia [1994].
BSFOCI Abbreviation for Bering Sea Fisheries Oceanography Coordinated Investigations, a NOAA COP program whose overall goal is to reduce uncertainty in resource management decisions through ecological research on recruitment and stock structure of walleye pollock, presently the largest single–species fishery in the world. A combination of basin circulation studies, analysis of recent and historical data, and development of genetic testing methods has advanced the definition of the stock structure of Bering Sea pollock in this program. See the BSFOCI Web site10.
BSPFTE Abbreviation for Barents Sea Polar Front Experiment. See the BSPFTE Web site11.
BTM Abbreviation for Bermuda Testbed Mooring Program.

Buchanan Deep See Angola Basin. Buchanan, John Young More later.
bucket temperature The surface temperature of the ocean as measured by a bucket thermometer. This can also be the temperature measured by immersing a surface thermometer into a freshly drawn bucket of water.
bucket thermometer A thermometer with an insulated container around the bulb. It is used to measure ocean temperatures by lowering it on a line, allowing it to equilibrate with the temperature of the surface water, withdrawing it along with the water surrounding it, and reading the temperature. The water serves both as insulation for the thermometer (after withdrawal) and as a sample for a salinity determination.
buffer factor Defined as the fractional change in atmospheric CO2 divided by the fractional change in oceanic DIC after equilibrium has been reached. This factor characterizes the fraction of the CO2 flux from the atmosphere to the mixed layer that will react to form carbonate and bicarbonate ions. This is also known as the Revelle factor. See Najjar [1991]. buffer sublayer That part of a boundary layer where the viscous stress and the Reynolds stress have the same order of magnitude and the linear velocity profile turns smoothly into the logarithmic profile.
See Kagan [1995].
bulk parameterizations In studying air–sea interactions, it is difficult to obtain direct measurements of the surface fluxes, and those that are available are extremely limited in geographic scope. Therefore, extensive, global–scale estimates must be obtained via parameterizations of the surface fluxes that permit the use of more easily obtained quantities. The basic premise of the concept of bulk parameterizations is to relate the surface layer fluxes to logarithmic profiles of the mean quantities. The fluxes can then be determined from the mean wind, temperature and humidity at a single height by introducing bulk transfer coefficients of heat, moisture and momentum. This method is also used to quantify gas exchange processes. See Geernaert [1990] and Rogers [1995].
 

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