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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z |  |
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First Edition Preface Second Edition Preface Acknowledgments
Section B B index 81-89 of 517 terms
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baroclinic wave1. Describes the synoptic-scale disturbance that grows in midlatitudes due to baroclinic instability. 2. Same as baroclinic disturbance.
baroclinic1. The variation with depth of motions associated with variation of density with depth. The baroclinic component of the velocity is the total minus the barotropic component. In a baroclinic state, neutral surfaces are inclined to surfaces of constant pressure. The baroclinic torque vector is proportional to the vector cross product and is responsible for generating vertical shears associated with baroclinic flow. 2. Of, pertaining to, or characterized by baroclinity.
baroclinicitySame as baroclinity.
baroclinity(Or baroclinicity.) The state of stratification in a fluid in which surfaces of constant pressure (isobaric) intersect surfaces of constant density (isosteric). The number, per unit area, of isobaric–isosteric solenoids intersecting a given surface is a measure of the baroclinity. If the surface is horizontal, this number N is given by where α is the specific volume and p the pressure. Barotropy is the state of zero baroclinity. See also barotropy.
barogramThe record of a barograph.
barographA recording barometer. Barographs may be classified, on the basis of their construction, into the following types: 1) aneroid barograph (including microbarograph); 2) float barograph; 3) photographic barograph; and 4) weight barograph. The aneroid barograph is the one most commonly used in weather stations.
U.S. Weather Bureau, 1941: Barometers and the Measurement of Atmospheric Pressure, Circular F, 7th ed., rev., 28–44.
barometer cisternThe cylindrical vessel in a mercury barometer into which the tube dips. The cistern may be adjustable (Fortin barometer) or fixed (Kew barometer) with respect to the tube.
barometer columnSame as mercury column.
barometer correctionsSame as barometric corrections.
barometer elevation(Or elevation of ivory point.) The vertical distance above mean sea level of the ivory point (zero point) of a station's mercurial barometer; frequently the same as station elevation. This term is denoted by the symbol Hz in international usage. The value of atmospheric pressure with reference to this level is termed actual pressure.
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