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Browsing by Author "Mahrt, L."

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Browsing by Author "Mahrt, L."

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  • Air Temperature Measurement Errors in Naturally Ventilated Radiation Shields 
    Nakamura, Reina; Mahrt, L. (American Meteorological Society, 2005-07)
    Two sources of systematic errors are considered for estimating air temperature. The first source is ambiguity of the definition of the standardized measurement height over vegetated surfaces of varying heights. Without s ...
  • Cloud-Top Entrainment Instability Observed in AMTEX 
    Mahrt, L.; Paumier, J. (American Meteorological Society, 1982-03)
    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. Th ...
  • Comments on “Determining Height of the Nocturnal Boundary Layer” 
    Mahrt, L.; Heald, R. C. (American Meteorological Society, 1979-03)
    No abstract available.
  • The Cospectral Gap and Turbulent Flux Calculations 
    Vickers, Dean; Mahrt, L. (American Meteorological Society, 2003-05)
    An alternative method to Fourier analysis is discussed for studying the scale dependence of variances and covariances in atmospheric boundary layer time series. Unlike Fourier decomposition, the scale dependence based on ...
  • Daytime Evolution of Relative Humidity at the Boundary Layer Top 
    Ek, M.; Mahrt, L. (American Meteorological Society, 1994-12)
    Data from the Hydrological and Atmospheric Pilot Experiment-Modélisation du Bilan Hydrigue (HAPEX-MOBILHY) field program and results from a one-dimensional model of the soil and atmospheric boundary layer are analyzed to ...
  • The Dependence of Boundary-Layer Shear on Diurnal Variation of Stability 
    Heald, R. C.; Mahrt, L. (American Meteorological Society, 1981-08)
    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 applic ...
  • Dependence of Turbulent and Mesoscale Velocity Variances on Scale and Stability 
    Mahrt, L.; Moore, Erin; Vickers, Dean; Jensen, N. O. (American Meteorological Society, 2001-03)
    The scale dependence of velocity variances is studied using data collected from a grassland site, a heather site, and four forested sites. The dependence of velocity variances on averaging time, used to define the fluctu ...
  • Determination of Surface Fluxes from the Surface Radiative Temperature 
    Sun, Jielun; Mahrt, L. (American Meteorological Society, 1995-04)
    This study examines the bulk aerodynamic method for estimating surface fluxes of heat and moisture using the surface radiative temperature. The surface radiative temperature is often the only available surface temperatur ...
  • Displacement Measurement Errors from Moving Platforms 
    Mahrt, L.; Vickers, Dean; Drennan, William M.; Graber, Hans C.; Crawford, Timothy L. (American Meteorological Society, 2005-07)
    Errors in eddy correlation measurements from moving platforms (aircraft, ships, buoys, blimps, tethered balloons, and kites) include contamination of the measured fluctuations by superficial fluctuations associated with ...
  • Eddy Asymmetry in the Sheared Heated Boundary Layer 
    Mahrt, L. (American Meteorological Society, 1991-02-01)
    Statistical measures are developed to study the influence of mean shear on the asymmetry of eddy updrafts as observed from low-level aircraft flights in HAPEX, FIFE, and SESAME. This asymmetry involves formation of micro ...
  • Estimation of Surface Heat Flux 
    Sun, Jielun; Esbensen, Steven K.; Mahrt, L. (American Meteorological Society, 1995-09)
    The authors reconsider the problem of estimating the sensible heat transfer at the earth's surface from direct measurements of turbulent fluxes in the atmospheric boundary layer. For simplicity, only horizontally homogen ...
  • Evaluating Formulations of Stable Boundary Layer Height 
    Vickers, D.; Mahrt, L. (American Meteorological Society, 2004-11)
    Stable boundary layer height h is determined from eddy correlation measurements of the vertical profiles of the buoyancy flux and turbulence energy from a tower over grassland in autumn, a tower over rangeland with varia ...
  • Exploring the Possible Role of Small-Scale Terrain Drag on Stable Boundary Layers over Land 
    Steeneveld, G. J.; Holtslag, A. A. M.; Nappo, C. J.; van de Wiel, B. J. H.; Mahrt, L. (American Meteorological Society, 2008-10)
    This paper addresses the possible role of unresolved terrain drag, relative to the turbulent drag on the development of the stable atmospheric boundary layer over land. Adding a first-order estimate for terrain drag to t ...
  • Flux Sampling Errors for Aircraft and Towers 
    Mahrt, L. (American Meteorological Society, 1998-04)
    Various errors and influences leading to differences between tower- and aircraft-measured fluxes are surveyed. This survey is motivated by reports in the literature that aircraft fluxes are sometimes smaller than tower-m ...
  • Formulation of Turbulent Fluxes in the Stable Boundary Layer 
    Mahrt, L.; Vickers, Dean (American Meteorological Society, 2003-10)
    The mixing lengths for heat and momentum are computed from seven levels of eddy correlation data during the Cooperative Atmosphere–Surface Exchange Study-1999 (CASES-99). A number of formulations of the mixing length a ...
  • Grid-Averaged Surface Fluxes 
    Mahrt, L. (American Meteorological Society, 1987-08)
    This study examines the inadequacies of formulations for surface fluxes for use in numerical models of atmospheric flow. The difficulty is that numerical models imply spatial averaging over each grid area. Existing formu ...
  • Heat fluxes over weak SST heterogeneity 
    Mahrt, L.; Khelif, D. (American Geophysical Union, 2010)
    The spatial variability of turbulence and surface heat flux are examined for the case of small air-surface temperature difference and modest sea-surface temperature variability. As a result of nonlinearities in the bulk ...
  • Heat Transport in the Atmospheric Boundary Layer 
    Mahrt, L.; Paumier, J. (American Meteorological Society, 1984-11)
    The structure of turbulence and transport of heat is examined from data obtained from 11 aircraft soundings executed in heated boundary layers during the Air Mass Transformation Experiment. Various influences on the turb ...
  • The Influence of Atmospheric Stability on Potential Evaporation 
    Mahrt, L.; Ek, Michael (American Meteorological Society, 1984-02)
    The Penman relationship for potential evaporation is modified to simply include the influence of atmospheric stability on turbulent transport of water vapor. Explicit expressions for the stability-dependent, surface exch ...
  • The Influence of Boundary Layer Pumping on Synoptic-Scale Flow 
    Mahrt, L.; Park, Soon-Ung (American Meteorological Society, 1976-08)
    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 ...

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