Index Catalog // ScholarsArchive@OSU

An Effective, Economic, Aspirated Radiation Shield for Air Temperature Observations and Its Spatial Gradients

Creator:: Thomas, Christoph K. and Smoot, Alexander R.
Abstract:: This paper presents the design and evaluates the performance of a double-walled electrically aspirated radiation shield for thermometers measuring air temperature and its gradients in the atmospheric surface layer. Tests were performed to quantify its solar radiation error and wake production, and to characterize the observer effect of the forced...
Resource Type:: Article
Full Text:: Radiation Shield for Air Temperature Observations and Its Spatial Gradients CHRISTOPH K. THOMAS AND

High-resolution wind speed measurements using actively heated fiber optics

Creator:: Sayde, Chadi, Thomas, Christoph K., Wagner, James, and Selker, John
Abstract:: We present a novel technique to simultaneously measure wind speed (U) at thousands of locations continuously in time based on measurement of velocity-dependent heat transfer from a heated surface. Measuring temperature differences between paired passive and actively heated fiber-optic (AHFO) cables with a distributed temperature sensing system allowed estimation of...
Resource Type:: Article
Full Text:: Sayde, C., Thomas, C. K., Wagner, J., & Selker, J. (2015). High‐resolution wind speed measurements

Concurrency of coherent structures and conditionally sampled daytime sub-canopy respiration

Creator:: Zeeman, Matthias J., Eugster, Werner, and Thomas, Christoph K.
Abstract:: We investigated an alternative means for quantifying daytime ecosystem respiration from eddy-covariance data in three forests with different canopy architecture. Our hypothesis was that the turbulent transport by coherent structures is the main pathway for carrying detectable sub-canopy respiration signals through the canopy. The study extends previously published work by...
Resource Type:: Article
Full Text:: respiration2 Matthias J. Zeeman · Werner Eugster ·3 Christoph K. Thomas4 5 Received: date / Accepted: date6

Toward biologically meaningful net carbon exchange estimates for tall, dense canopies: Multi-level eddy covariance observations and canopy coupling regimes in a mature Douglas-fir forest in Oregon

Creator:: Thomas, Christoph K., Martin, Jonathan G., Law, Beverly E., and Davis, Kent
Abstract:: We sought to improve net ecosystem exchange (NEE) estimates for a tall, dense, mature Douglas-Fir forest in the Oregon Coast range characterized by weak flows, systematic wind directional shear, and limited turbulent mixing throughout the diurnal period. We used eddy covariance (EC) observations at two levels and concurrent biological measurements...
Resource Type:: Article
Full Text:: coupling regimes in a mature Douglas-fir forest in Oregon Christoph K. Thomasa,b,∗, Jonathan G. Martinb

High-resolution fibre-optic temperature sensing: A new tool to study the two-dimensional structure of atmospheric surface-layer flow

Creator:: Thomas, Christoph K., Kennedy, Adam M., Selker, John S., Moretti, Ayla, Schroth, Martin H., Smoot, Alexander R., Tufillaro, Nicholas B., and Zeeman, Matthias J.
Abstract:: We present a novel approach based on fibre-optic distributed temperature sensing (DTS) to measure the two-dimensional thermal structure of the surface layer at high resolution (0.25 m, ≈ 0.5 Hz). Air temperature observations obtained from a vertically oriented fibre optics array of approximate dimensions 8 m x 8 m and...
Resource Type:: Article
Full Text:: to study the two-dimensional structure of atmospheric2 surface-layer flow3 Christoph K. Thomas· Adam

Introducing a sensor to measure budburst and its environmental drivers

Creator:: Kleinknecht, George J., Lintz, Heather E., Kruger, Anton, Niemeier, James J., Salino-Hugg, Michael J., Thomas, Christoph K., Still, Christopher J., and Kim, Youngil
Abstract:: Budburst is a key adaptive trait that can help us understand how plants respond to a changing climate from the molecular to landscape scale. Despite this, acquisition of budburst data is constrained by a lack of information at the plant scale on the environmental stimuli associated with the release of...
Resource Type:: Article
Full Text:: drivers Kleinknecht, G. J., Lintz, H. E., Kruger, A., Niemeier, J. J., Salino-Hugg, M. J., Thomas, C. K

Comprehensive multiyear carbon budget of a temperate headwater stream

Creator:: Argerich, Alba, Haggerty, Roy, Johnson, Sherri L., Wondzell, Steven M., Dosch, Nicholas, Corson-Rikert, Hayley, Ashkenas, Linda R., Pennington, Robert, and Thomas, Christoph K.
Abstract:: Headwater streams comprise nearly 90% of the total length of perennial channels in global catchments. They mineralize organic carbon entering from terrestrial systems, evade terrestrial carbon dioxide (CO₂ ), and generate and remove carbon through in-stream primary production and respiration. Despite their importance, headwater streams are often neglected in global...
Resource Type:: Article

Non-stationary Generation of Weak Turbulence for Very Stable and Weak-Wind Conditions

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

Performance of wood treated with prospective organic surface protectants upon outdoor exposure: FTIR spectroscopic analysis of weathered surfaces

Creator:: Schauwecker, Christoph F., McDonald, Armando G., and Morrell, Jeff J.
Abstract:: Visual appeal of wood is as important as its structural integrity in outdoor applications. Discoloration and checking of wood favor the utilization of alternative materials for outdoor cladding and decking. Lignin depolymerization is one of the critical processes leading to weathering. In the present paper, the potential of different classes...
Resource Type:: Article
Full Text:: -2011-0247 Holzforschung 2013; 67(2): 227–235 Christoph F. Schauwecker *, Armando G

Seasonality of U[superscript K’]₃₇ temperature estimates as inferred from sediment trap data

Creator:: Rosell-Melé, Antoni and Prahl, Fredrick G.
Abstract:: The seasonality of sea surface temperatures (SST) estimated from the alkenone-U[superscript K’]₃₇ index has been a debated issue since the development of the sediment trap time series data from 34 sampling locations, we show that the maximum alkenone flux in sediment traps varies markedly across the oceans, only on latitude...
Resource Type:: Article
Full Text:: Seasonality of U-37(K)' temperature estimates as inferred from

ScholarsArchive@OSU

An Effective, Economic, Aspirated Radiation Shield for Air Temperature Observations and Its Spatial Gradients

High-resolution wind speed measurements using actively heated fiber optics

Concurrency of coherent structures and conditionally sampled daytime sub-canopy respiration

Toward biologically meaningful net carbon exchange estimates for tall, dense canopies: Multi-level eddy covariance observations and canopy coupling regimes in a mature Douglas-fir forest in Oregon

High-resolution fibre-optic temperature sensing: A new tool to study the two-dimensional structure of atmospheric surface-layer flow

Introducing a sensor to measure budburst and its environmental drivers

Comprehensive multiyear carbon budget of a temperate headwater stream

Non-stationary Generation of Weak Turbulence for Very Stable and Weak-Wind Conditions

Performance of wood treated with prospective organic surface protectants upon outdoor exposure: FTIR spectroscopic analysis of weathered surfaces

Seasonality of U[superscript K’]₃₇ temperature estimates as inferred from sediment trap data

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