Index Catalog // ScholarsArchive@OSU

Creator:: Mahrt, L. and Park, Soon-Ung
Abstract:: The influence of boundary layer pumping on an externally forced, synoptic-scale flow is examined. The results follow earlier theories of stratified incompressible Boussinesq flow theories in that the spin-down time scale and the penetration depth of the influence of boundary layer pumping are inversely proportional to the stratification and proportional...
Resource Type:: Article

Creator:: Mahrt, L.
Abstract:: Radiosonde data from the National Hail Research Experiment and the Wangara experiment are examined to study vertical gradients of moisture in heated boundary layers which are well-mixed in virtual potential temperature. The frequent occurrence of a significant decrease of moisture with height in the mixed layer over the high plains...
Resource Type:: Article

Creator:: Mahrt, L.
Abstract:: Early afternoon environmental conditions preceding hail-producing thunderstorms are statistically compared with conditions for classes of less severe moist convection using only data from individual radiosonde releases collected during the National Hail Research Experiment in northeast Colorado. The ensuing analyses emphasize the thermodynamic characteristics of the mixed layer and immediate overlying...
Resource Type:: Article

Creator:: Lenschow, D. H., Stankov, B. B., and Mahrt, L.
Abstract:: Even slight terrain inhomogeneities can cause large horizontal variations in the clear, stably stratified, nocturnal boundary layer largely through cold air drainage. By early morning the valleys and depressions can be several degrees cooler than the adjacent slopes and plateaus. As surface heating begins in the morning, these horizontal variations...
Resource Type:: Article

Creator:: Mahrt, L. and Pierce, Donald
Abstract:: A simple analytical expression is developed to relate the energy required to initiate moist convection to boundary-layer properties. This expression and exploratory regression are applied to data from the National Hail Research Experiment to discriminate between environments leading to cumulus congestus and well-developed hail-producing thunderstorms in northeast Colorado. In this...
Resource Type:: Article

Creator:: Smith, Bartlett and Mahrt, L.
Abstract:: An analytical two-layer approximation of atmospheric flow is developed to study boundary-layer production of vertical motion. The model consists of a boundary layer topped by a free-flow layer. Both layers am time-dependent and possess different values of stratification. The boundary-layer equations are layer-integrated over a fixed depth and surface stress...
Resource Type:: Article

Creator:: Heald, R. C. and Mahrt, L.
Abstract:: Boundary-layer data from several different geographical locations are analyzed to document the behavior of boundary-layer shear above the surface. The influence of diurnal variation of stability is emphasized. The applicability of the power law for use in shear estimates is examined.
Resource Type:: Article

Creator:: Mahrt, L., Andre, J. C., and Heald, R. C.
Abstract:: The depth of the nocturnal boundary layer, modeled by diagnostic functions of surface fluxes, is only weakly related to “observed” depths estimated from observed profiles of either wind or temperature as has been shown in previous studies. This is partly due to influences of nonstationarity and large errors in the...
Resource Type:: Article

Creator:: Mahrt, L. and Paumier, J.
Abstract:: Aircraft data collected at the top of a cloud-topped mixed layer during the Air Mass Transformation Experiment are analyzed. Entrainment instability due to evaporation of liquid water is found to occur intermittently. This instability and upward heat flux occur frequently at the downstream edge of cloudy mixed-layer motions which have...
Resource Type:: Article

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