Steven Oncley

NSF National Center for Atmospheric Research

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Donald H. Lenschow

NSF National Center for Atmospheric Research

T.W. Horst

NSF National Center for Atmospheric Research

A. C. Delany

NSF National Center for Atmospheric Research

Julie K. Lundquist

University of Colorado Boulder

William O. Brown

NSF National Center for Atmospheric Research

James M. Wilczak

National Oceanic and Atmospheric Administration

Sean P. Burns

University of Colorado Boulder

Jielun Sun

Northwest Research Associates

Steven R. Semmer

NSF National Center for Atmospheric Research

Jakob Mann

Technical University of Denmark

Cooperative Institutions

NSF National Center for Atmospheric Research

133

University of Colorado Boulder

National Oceanic and Atmospheric Administration

Cooperative Institute for Research in Environmental Sciences

NOAA Earth System Research Laboratory

University of Colorado System

University of Wisconsin–Madison

University of Notre Dame

ASTER

University of Utah

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Correction to: Atmospheric Stability Effects on Wind Fields and Scalar Mixing Within and Just Above a Subalpine Forest in Sloping Terrain

Boundary-Layer Meteorology (2019)

Sean P. Burns Jielun Sun Donald H. Lenschow Steven Oncley B. B. Stephens

Mistake

Subalpine forest

10.1007/s10546-019-00436-5

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Citations (0)

Measurements of Flow Distortion within the IRGASON Integrated Sonic Anemometer and CO$$_2$$/H$$_2$$O Gas Analyzer

Boundary-Layer Meteorology (2016)

T.W. Horst Roland Vogt Steven Oncley

Anemometer

Distortion (music)

Supersonic wind tunnel

10.1007/s10546-015-0123-8

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Citations (17)

Corrections to Inertial-Range Power Spectra Measured by Csat3 and Solent Sonic Anemometers,1. Path-Averaging Errors

Boundary-Layer Meteorology (2006)

T.W. Horst Steven Oncley

Anemometer

10.1007/s10546-005-9015-7

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Citations (44)

The Summertime Arctic Atmosphere: Meteorological Measurements during the Arctic Ocean Experiment 2001

Bulletin of the American Meteorological Society (2004)

Michael Tjernström Caroline Leck Ola Persson Michael L. Jensen Steven Oncley

"Experimental Equipment: A Supplement to The Summertime Arctic Atmosphere: Meteorological Measurements during the Arctic Ocean Experiment 2001" published on Sep 2004 by American Meteorological Society.

10.1175/bams-85-9-1305

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Citations (120)

California ozone deposition experiment: Methods, results, and opportunities

Atmospheric Environment (1995)

J. R. Pederson W. J. Massman L. Mahrt A. C. Delany Steven Oncley

Tropospheric ozone

San Joaquin

Deposition

10.1016/1352-2310(95)00136-m

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Citations (66)

Ground heat flux determination based on near-surface soil hydro-thermodynamics

Journal of Hydrology (2020)

B. Wu Steven Oncley Huiling Yuan Fei Chen

Soil thermal properties

Bowen ratio

10.1016/j.jhydrol.2020.125578

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Citations (16)

Surface-Layer Fluxes, Profiles, and Turbulence Measurements over Uniform Terrain under Near-Neutral Conditions

Journal of the Atmospheric Sciences (1996)

Steven Oncley Carl A. Friehe John C. LaRue J. A. Businger E. C. Itsweire

An atmospheric surface-layer experiment over a nearly uniform plowed field was performed to determine the constants in the flux-profile similarity formulas, particularly the von Kármán constant. New instruments were constructed to minimize flow distortion effects on the turbulence measurements and to provide high-resolution gradient measurements. In addition, a hot-wire anemometer directly measured the turbulent kinetic energy dissipation rate. An average value of the von Kármán constant of 0.365 ± 0.015 was obtained from 91 runs (31 h) in near-neutral stability conditions. However, four near-neutral runs when snow covered the ground gave an average value of 0.42. This result suggests that the von Kármán constant depends on the roughness Reynolds number, which may resolve some of the differences in previous determinations over different surfaces. The one-dimensional Kolmogorov inertial subrange constant was found to have a value of 0.54 ± 0.03, slightly larger than previous results. The flux-profile relations for momentum and temperature variance were evaluated, and humidity variance data behaved similarly to temperature. Dissipation of turbulent kinetic energy was found to be less than production under near-neutral conditions, which suggests that turbulent or pressure transport may be significant.

Anemometer

Surface layer

10.1175/1520-0469(1996)053<1029:slfpat>2.0.co;2

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Citations (219)

Investigating the Effects of Land Use Change on Subsurface, Surface, and Atmospheric Branches of the Hydrologic Cycle in Central Argentina

Water Resources Research (2021)

Sujan Pal Francina Domínguez Pablo Bollatti Steven Oncley Yi Yang

Abstract Since the 1970s, land cover in central Argentina has shifted away from perennial crops and grasses toward annual crops, largely soy. In this study, we use observations and modeling to understand how this shift in land use has affected the sub‐surface, surface, and atmospheric fluxes of moisture and energy in a flat agricultural area. We analyze the flux tower data from a paired site at Marcos Juarez in central Argentina during the period of the RELAMPAGO field campaign (2018–2019). When compared to perennial alfalfa, the observations over soy show lower evapotranspiration (ET) and specific humidity, higher sensible heat, higher outgoing shortwave radiation, and soil temperature. Water table (WT) depth is shallower below the soy than the alfalfa sites. To better understand the long‐term temporal behavior from 1970s to present, the Budyko framework is used to show that the trends in ET cannot be explained by climate variables alone. We then use the Noah‐MP land surface model calibrated at both soy and alfalfa sites. Long‐term simulations of the calibrated model suggests that ∼95% of precipitation is evaporated in the alfalfa site with negligible recharge and runoff. Contrarily in the case of soy, ET is about 68% of precipitation, leaving nearly 28% for recharge and 4% for runoff. Observed increases in streamflow and decreases in WT depth over time are likely linked to shifts in land cover. Furthermore, the partitioning of net radiation shifts from latent heat to sensible heat resulting in a 250% increase in Bowen ratio (from 0.2 to 0.7).

Land Cover

Shortwave radiation

Bowen ratio

Water cycle

10.1029/2021wr029704

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Citations (9)

A summer expedition with the Swedish icebreaker Oden found a moist, cloudy, but well-mixed Arctic boundary layer, with a persistent capping inversion, many shallow mesoscale fronts, and features generally unique to polar conditions.

Michael Tjernström Caroline Leck Ola Persson Michael L. Jensen Steven Oncley

Mixed layer

Source

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