Index Catalog // ScholarsArchive@OSU

Creator:: Mahrt, Larry, Sun, Jielun, MacPherson, J. I., Jensen, N. O., and Desjardins, R. L.
Abstract:: 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 is not directly available from observations or in numerical models. The aerodynamic temperature is normally replaced with either the...
Resource Type:: Article

Creator:: Sun, Jielun, Mahrt, Larry, Nappo, Carmen, and Lenschow, Donald H.
Abstract:: The authors investigate atmospheric internal gravity waves (IGWs): their generation and induction of global intermittent turbulence in the nocturnal stable atmospheric boundary layer based on the new concept of turbulence generation discussed in a prior paper by Sun et al. The IGWs are generated by air lifted by convergence forced...
Resource Type:: Article

Creator:: Sun, Jielun, Lenschow, Donald H., Mahrt, Larry, and Nappo, Carmen
Abstract:: Relationships among the horizontal pressure gradient, the Coriolis force, and the vertical momentum transport by turbulent fluxes are investigated using data collected from the 1999 Cooperative Atmosphere-Surface Exchange Study (CASES-99). Wind toward higher pressure (WTHP) adjacent to the ground occurred about 50% of the time. For wind speed at 5...
Resource Type:: Article

Creator:: Sun, Jielun, Mahrt, Larry, Banta, Robert M., and Pichugina, Yelena L.
Abstract:: 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 turbulence regime when the wind speed is less than a threshold value; 2) regime 2, a strong turbulence regime when the...
Resource Type:: Article

Creator:: 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., and Zappa, Chris
Abstract:: 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, and momentum across the air–sea interface. CBLAST-LOW was designed to investigate these processes at the low-wind extreme...
Resource Type:: Article

Creator:: Banta, Robert M., Mahrt, Larry, Vicker, Dean, Sun, Jielun, Balsley, Ben B., Pichugina, Yelena L., and Williams, Eric J.
Abstract:: 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 gradients near the surface. Here five nights with weak-wind, very stable boundary layers during the Cooperative Atmosphere–Surface Exchange Study (CASES-99)...
Resource Type:: Article

Creator:: Mahrt, Larry and Sun, Jielun
Abstract:: 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 size. The main goal of this study is the assessment of the importance of such scale-dependence. When the large-scale...
Resource Type:: Article

Creator:: Mahrt, Larry, Lenschow, D. H., Sun, Jielun, Weil, J. C., MacPherson, J. I., and Desjardins, R. L.
Abstract:: 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 sequential flight legs of the Canadian Twin Otter research aircraft over the same track at 33 m above...
Resource Type:: Article

Creator:: Mahrt, Larry, Vickers, Dean, Sun, Jielun, Crawford, Timothy L., Crescenti, Gennaro, and Frederickson, Paul
Abstract:: 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-surface turbulence for the first few kilometers offshore. With offshore flow of warm air over cold water,...
Resource Type:: Article

Creator:: Mahrt, Larry, Kotwica, K., Sun, Jielun, MacPherson, J.I., and Desjardins, R.L.
Abstract:: 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 Index and albedo. Previous relationships break down when applied simultaneously to a variety of surfaces. The zenith angle is required to account...
Resource Type:: Article

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