Index Catalog // ScholarsArchive@OSU

Creator:: Vickers, Dean and Mahrt, Larry
Abstract:: Eddy‐correlation fluxes are compared to air‐sea fluxes predicted by a widely used bulk flux formulation without wave‐state effects. Systematic discrepancies are found. For example, the model approximately equates the roughness lengths for heat and moisture; however, the observed roughness length for heat (zoh) exceeds that for moisture (zoq) by an...
Resource Type:: Article
Full Text:: generally exceeds that for moisture. For 10-m wind speeds above a threshold value of 12 m s�1, zoq exceeds

Creator:: Lee, Young-Hee and Mahrt, Larry
Abstract:: This study evaluates the prediction of heat and moisture fluxes from a new land surface scheme with eddy correlation data collected at the old aspen site during the Boreal Ecosystem-Atmosphere Study (BOREAS) in 1994. The model used in this study couples a multilayer vegetation model with a soil model. Inclusion...
Resource Type:: Article
Full Text:: Þ þ S 1ð Þð Þ þ q1 � q2 Rk 1ð Þ ð1Þ q1 � q2 Rk 1ð Þ ¼ q2 � q2v Rb 2ð Þ þ Rsun 2ð Þ Lsun 2ð Þ

Creator:: Klipp, Cheryl L. and Mahrt, Larry
Abstract:: The correlation between dimensionless shear ϕₘ and dimensionless height z/L, where L is the Obukhov length, for stable conditions is strongly influenced by self‐correlation for the present datasets. This effect is quite large for stronger stability but still significant for near‐neutral conditions. A conditional analysis of nocturnal stable boundary‐layer data,...
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Full Text:: L. KLIPP and LARRY MAHRT∗ Oregon State University, Corvallis, USA (Received 21 August 2003; revised

Creator:: Nakamura, Reina and Mahrt, Larry
Abstract:: The stable nocturnal boundary layer is commonly viewed or modelled as a balance between the temperature tendency (cooling) and vertical heat-flux divergence. Sometimes the radiative-flux divergence is also included. This perspective has dictated the design of field experiments for investigating stable nocturnal boundary layers. Tower-based micrometeorological data from three field...
Resource Type:: Article
Full Text:: radiative cooling rates. NOCTURNAL HEAT BUDGETS 393 0.1 0 0.1 0.2 0.1 0 0.1 0.2 [w] cont (m s 1

Creator:: Vickers, Dean and Mahrt, Larry
Abstract:: Vertical profiles of the time-averaged wind stress, wind speed and buoyancy flux from the off-shore tower site in the Risø Air Sea Experiment are used to evaluate similarity theory in the coastal zone. The observed dependence of the non-dimensional wind shear on stability is compared to the traditional parametrization. Relationships...
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Full Text:: was less than 2.5 m s-l were excluded; because the cup anemometers were calibrated for the generally

Creator:: Mahrt, Larry and Vickers, D.
Abstract:: The sublimation of snow and evaporation of melted snow is contrasted between brush, grass and bare ground sites using eddy-correlation data. Averaged over the entire winter season, the evaporation/sublimation is about 20% greater over the brush site than the bare ground site, apparently due to greater supply of snow. Blowing...
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Full Text:: moisture flux (<2× 10−3 g Kg−1 m s−1), in order to eliminate cases with substantial relative errors in

Creator:: Moore, Erin and Mahrt, Larry
Abstract:: Using eddy correlation data collected by the LongEZ research aircraft, the adjustment of atmospheric flow downstream from a coastline is examined. Along-shore variation of the turbulence over the water is generated by the varying width of the upstream land strip between the sea and inland water. Over the coastal zone,...
Resource Type:: Article
Full Text:: . Wea. Rev., 129, 1251–1258, 2001. Winstead, N. S., and P. D. Mourad, Shallow Great Lake-Scale

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
Full Text:: roughly 5 m-ls except for CODE flight 19 where the wind was only 1-2 m-'s. The CODE data consist of 30 km

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
Full Text:: , Corvallis, Oregon LARRY MAHRT Northwest Research Associates (Seattle Division), Corvallis, Oregon EDGAR L

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
Full Text:: LARRY MAHRT NorthWest Research Associates, Inc., Corvallis, Oregon DEAN VICKERS College of Earth

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