Index Catalog // ScholarsArchive@OSU

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:: Vickers, Dean, Mahrt, Larry, and Andreas, Edgar L.
Abstract:: Over 5000 aircraft eddy-covariance measurements from four different aircraft in nine different experiments are used to develop a simple model for the friction velocity over the sea. Unlike the widely used Coupled Ocean–Atmosphere Response Experiment (COARE) bulk flux scheme, the simple model (i) does not use Monin–Obukhov similarity theory (MOST)...
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:: Andreas, Edgar L., Jordan, Rachel E., Mahrt, Larry, and Vickers, Dean
Abstract:: The Bowen ratio, the ratio of the turbulent surface fluxes of sensible (Hₛ) and latent (Hₗ) heat, Bo ≡ Hₛ/Hₗ, occurs throughout micrometeorology. It finds application in the Bowen ratio and energy budget method, where it provides both turbulent heat fluxes when only the available energy at the surface is...
Resource Type:: Article

Creator:: Edson, James B., Jampana, Venkata, Weller, Robert A., Bigorre, Sebastien P., Plueddemann, Albert J., Fairall, Christopher W., Miller, Scott D., Mahrt, Larry, Vickers, Dean, and Hersbach, Hans
Abstract:: This study investigates the exchange of momentum between the atmosphere and ocean using data collected from four oceanic field experiments. Direct covariance estimates of momentum fluxes were collected in all four experiments and wind profiles were collected during three of them. The objective of the investigation is to improve parameterizations...
Resource Type:: Article

Creator:: Mahrt, Larry, Thomas, Christoph, Richardson, Scott, Seaman, Nelson, Stauffer, David, and Zeeman, Matthias
Abstract:: Turbulence measurements for very stable conditions near the surface are contrasted among three sites: a high altitude basin during winter with grass or snow-covered grass, a broad valley with complex agricultural land use, and a more narrow valley that is influenced by a valley cold pool and cold air drainage....
Resource Type:: Article

Creator:: Vickers, Dean, Mahrt, Larry, and Andreas, Edgar L.
Abstract:: The 10-m neutral drag coefficient (C[subscript DN10]) over the sea is calculated using a large observational dataset consisting of 5800 estimates of the mean flow and the fluxes from aircraft eddy-covariance measurements. The dataset includes observations from 11 different experiments with four different research aircraft. One of the goals is...
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:: Andreas, Edgar L., Mahrt, Larry, and Vickers, Dean
Abstract:: From almost 7000 near-surface eddy-covariance flux measurements over the sea, the authors deduce a new air–sea drag relation for aerodynamically rough flow: u* = 0.0583Uₙ₁₀ 2 0.243. Here u* is the measured friction velocity, and Uₙ₁₀ is the neutral-stability wind speed at a reference height of 10 m. This relation...
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

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