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Browsing by Author "Sun, Jielun"

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Browsing by Author "Sun, Jielun"

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  • The Coupled Boundary Layers and Air–Sea Transfer Experiment in Low Winds 
    Edson, James; Crawford, Timothy; Crescenti, Jerry; Farrar, Tom; Frew, Nelson; Gerbi, Greg; Helmis, Costas; Hristov, Tihomir; Khelif, Djamal; Jessup, Andrew; Jonsson, Haf; Li, Ming; Mahrt, Larry; McGillis, Wade; Plueddemann, Albert; Shen, Lian; Skyllingstad, Eric; Stanton, Tim; Sullivan, Peter; Sun, Jielun; Trowbridge, John; Vickers, Dean; Wang, Shouping; Wang, Qing; Weller, Robert; Wilkin, John; Williams, Albert J. III; Yue, D. K. P.; Zappa, Chris (American Meteorological Society, 2007-03)
    The Office of Naval Research's Coupled Boundary Layers and Air–Sea Transfer (CBLAST) program is being conducted to investigate the processes that couple the marine boundary layers and govern the exchange of heat, mass, a ...
  • Dependence of surface exchange coefficients on averaging scale and grid size 
    Mahrt, Larry; Sun, Jielun (1995-05-02)
    The value of the effective exchange coefficient for area-averaged fluxes can depend significantly on the averaging scale. This dependence implies that the exchange coefficient in numerical models should depend on grid si ...
  • 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 ...
  • Estimation of area-averaged moisture flux 
    Mahrt, Larry; Kotwica, K.; Sun, Jielun; MacPherson, J.I.; Desjardins, R.L. (1998)
    Toward the goal of predicting area-averaged evapotranspiration, the evaporative fraction is modelled in terms of surface radiation temperature, air temperature, solar zenith angle, Normalized Difference of the Vegetation ...
  • 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 ...
  • Formulation of surface heat flux: application to BOREAS 
    Mahrt, Larry; Sun, Jielun; MacPherson, J.I.; Jensen, N.O.; Desjardins, R.L. (American Geophysical Union, 1997-12-26)
    The aerodynamic temperature is required for prediction of the surface heat flux using Monin-Obukhov similarity. This "fictitious" temperature is not systematically equal to the actual air temperature near the surface and ...
  • Lake-induced atmospheric circulations during BOREAS 
    Sun, Jielun; Lenschow, Donald H.; Mahrt, Larry; Crawford, Tim L.; Davis, Kenneth J.; Oncley, Steve P.; MacPherson, J.I.; Wang, Qing; Dobosy, Ron J.; Desjardins, R.L. (American Geophysical Union, 1997-12-26)
    Lake-induced atmospheric circulations over three lakes ranging from 3 to 10 km width are analyzed using data from three aircraft during the 1994 Boreal Ecosystem-Atmosphere Study (BOREAS). A well-defined divergent lake b ...
  • Momentum transfer over the coastal zone 
    Sun, Jielun; Vandemark, Douglas; Mahrt, Larry; Vickers, Dean; Crawford, Timothy; Vogel, Christoph (American Geophysical Union, 2001-06-27)
    Spatial variations of surface stress over the coastal shoaling zone are studied offshore of Duck, North Carolina, by the LongEZ research aircraft, equipped to measure both atmospheric turbulence and oceanic waves. We fin ...
  • Observations of Fluxes and Inland Breezes over a Heterogeneous Surface 
    Mahrt, L.; Sun, Jielun; Vickers, Dean; MacPherson, J. I.; Pederson, J. R.; Desjardins, R. L. (American Meteorological Society, 1994-09-01)
    Repeated aircraft runs at about 33 m over heterogeneous terrain are analyzed to study the spatial variability of the mesoscale flow and turbulent fluxes. An irrigated area, about 12 km across, generates a relatively cool ...
  • Ozone fluxes over a patchy cultivated surface 
    Mahrt, Larry; Lenschow, D.H.; Sun, Jielun; Weil, J.C.; MacPherson, J.I.; Desjardins, R.L. (American Geophysical Union, 1995-11-20)
    This study examines the spatial variability of ozone fluxes over flat heterogeneous terrain consisting of a patchwork of irrigated and nonirrigated surfaces. Fluxes of ozone and other quantities are computed from eight s ...
  • Scale Dependence of Air-Sea Fluxes over the Western Equatorial Pacific 
    Sun, Jielun; Howell, James F.; Esbensen, Steven K.; Mahr, L.; Greb, Christine M.; Grossman, Robert; LeMone, M. A. (American Meteorological Society, 1996-11)
    The goal of this study is to examine the horizontal scale dependence of vertical eddy flux in the tropical marine surface boundary layer and how this scale dependence of flux relates to the bulk aerodynamic relationship ...
  • Spatial Distribution of Surface Fluxes Estimated from Remotely Sensed Variables 
    Sun, Jielun; Mahrt, L. (American Meteorological Society, 1994-11)
    This study relates surface fluxes to remotely sensed variables over well-defined variations of surface wetness and vegetation. The surface fluxes are estimated from repeated Twin Otter aircraft flights at 33 m above the ...
  • Structure of Offshore Flow 
    Vickers, Dean; Mahrt, L.; Sun, Jielun; Crawford, Tim (American Meteorological Society, 2001-05)
    The horizontal and vertical structure of the mean flow and turbulent fluxes are examined using aircraft observations taken near a barrier island on the east coast of the United States during offshore flow periods. The ...
  • The Subgrid Velocity Scale in the Bulk Aerodynamic Relationship for Spatially Averaged Scalar Fluxes 
    Mahrt, L. T.; Sun, Jielun (American Meteorological Society, 1995-10)
    The exchange coefficients for area-averaged surface fluxes can become anomalously large when the large-scale flow is weak and significant fluxes of heat and moisture are driven by mesoscale motions within the averaging o ...
  • Surface stress in offshore flow and quasi-frictional decoupling 
    Mahrt, Larry; Vickers, Dean; Sun, Jielun; Crawford, Timothy L.; Crescenti, Gennaro; Frederickson, Paul (American Geophysical Union, 2001-09-27)
    Aircraft data collected at approximately 15 m above the sea surface in the coastal zone are analyzed to examine the spatial distribution of surface stress. Advection of stronger turbulence from land dominates the near-su ...
  • Turbulence Regimes and Turbulence Intermittency in the Stable Boundary Layer during CASES-99 
    Sun, Jielun; Mahrt, Larry; Banta, Robert M.; Pichugina, Yelena L. (American Meteorological Society, 2012-01)
    An investigation of nocturnal intermittent turbulence during the Cooperative Atmosphere Surface Exchange Study in 1999 (CASES-99) revealed three turbulence regimes at each observation height: 1) regime 1, a weak turbulen ...
  • The Very Stable Boundary Layer on Nights with Weak Low-Level Jets 
    Banta, Robert M.; Mahrt, Larry; Vicker, Dean; Sun, Jielun; Balsley, Ben B.; Pichugina, Yelena L.; Williams, Eric J. (American Meteorological Society, 2007-09)
    The light-wind, clear-sky, very stable boundary layer (vSBL) is characterized by large values of bulk Richardson number. The light winds produce weak shear, turbulence, and mixing, and resulting strong temperature grad ...

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