A second-generation large-aperature scintillometer
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U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Environmental Research Laboratories, Wave Propagation Laboratory, For sale by the National Technical Information Service , Boulder, Colo, Springfield, VA
Meteorological instruments., Scintillation counters., Refractive index -- Measure
|Other titles||Second generation large aperture scintillometer.|
|Statement||G.R. Ochs, J.J. Wilson.|
|Series||NOAA technical memorandum ERL WPL -- 232.|
|Contributions||Wilson, J. J., Wave Propagation Laboratory.|
|The Physical Object|
|Pagination||iii, 24 p.|
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Through the use of large aperture scintillometers, one can reliably measure the daily sensi- ble heat ux, which in turn can be used to derive evapotranspiration. Currently, New Mexico Tech has nine rst generation Kipp & Zonen scin- tillometers, as well as one second generation Kipp & Zonen Size: 4MB.
Eddy covariance (EC) and large aperture scintillometer (LAS) measurements were collected over an irrigated olive orchard near Marrakech, Morocco. The tall, sparse vegetation in the experimental site was relatively homogeneous, but during irrigation events spatial variability in soil humidity was by: For a 15 cm aperture scintillometer mounted 40 m above the surface, and a path length of m saturation sets in at a heat flux of less than Wm This puts a limitation on the maximum useful distance of a scintillometer.
There are several ways to extend the range of a scintillometer. One solution is the use of larger apertures.
The Scintec BLS Large Aperture Scintillometer measures A second-generation large-aperature scintillometer book turbulence and heat flux over path lengths between m and m. As part of a meteorological station it can also be used to determine the evapotranspiration over extended areas.
A scintillometer senses turbulence between an optical transmitter and a Size: KB. An incoherent scintillometer with m aperture was testedalong a km path over grassland. Scintillometer derived heat fluxes were comparedwith in situ eddy covariance measurements.
Albeit with considerable scatter, the fluxescompared well during daytime. During nighttime credible fluxes are also obtained. The scintillometerfunctioned satisfactory for 96% of Cited by: Large Aperture Scintillometer Intercomparison Study Article (PDF Available) in Boundary-Layer Meteorology (1) July with Reads How we measure 'reads'.
Large Aperture Scintillometer (LAS) Operational procedure at micromet-KCL Version 4 –Strand Roof Mariana L. Gouvea September Instrument Alignment Settings • Current adjust at transmitter back panel adjusted to mA • Path length potentiometer setting at.
The LAS MkII Large Aperture Scintillometer provides continuous measurements over path lengths from m up to km. It is the only scintillometer currently available with a built-in display and control-pad. It has internal digital processing to make calculations in-situ and to store data and results.
(EC) and a large aperture scintillometer (LAS) in the Heihe River Basin, China, in and We also determined the source areas of EC and LAS measurements for each site.
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The results show that the main EC source area was within a radius of m at all sites. The main source area for the LAS (with a path length of. The Scintec BLS Large Aperture Scintillometer measures atmospheric turbulence, heat flux and crosswind over path lengths between m (with Path Reduction Aperture, otherwise m) and m.
As part of a meteorological station it can also be used to determine the evapotranspiration over extended areas. Liu et al.: A comparison of eddy-covariance and large aperture scintillometer measurements 1.
2 3 4 5 6 7 8 9 10 11 12 13 14 15 Fig Towards the end of the experiment zo was increased to m following some regrowth after rain. The large-aperture scintillometer was mounted at a height of m above the ground on a plinth constructed of concrete blocks. This was done after difficulties experienced the previous season in maintaining the laser alignment (Green et al., ).Cited by: A scintillometer is a scientific device used to measure small fluctuations of the refractive index of air caused by variations in temperature, humidity, and pressure.
It consists of an optical or radio wave transmitter and a receiver at opposite ends of an atmospheric propagation path. The receiver detects and evaluates the intensity fluctuations of the transmitted signal, called.
The Scintec BLS Large Aperture Scintillometer measures atmospheric turbulence and heat flux over path lengths between m (with Path Reduction Aperture, otherwise m) and m. As part of a meteorological station it can also be used to determine the evapotranspiration over extended areas.
The Large Aperture Scintillometer (LAS) has been developedin the ’s (Wang et al., ). It has been applied to measure a number of atmospheric surface layer quantities, most notably the structure function parameter of the refractive index, Cn2 (Ochs and Wang, ), the wind speed across the scintillometer.
Wilson, J. Overview. Works: A second-generation large-aperature scintillometer by G. R Ochs (Book) 2 editions published Theory and performance of the WPL Crosswind Profiler Model II by G. R Ochs (Book) 2 editions published.
The large aperture scintillometer (LAS), which uses an incoherent beam in the near infrared region (Ochs and Wilson, ) is becoming popular in hydrometeorological studies (De Bruin et al., ; McAneney et al., ; Lagouarde et al., ; Chehbouni et al., ) because it is a relatively cheap, robust instrument which can be used to Cited by: The accuracy in determining sensible heat flux (H) of three Kipp and Zonen large aperture scintillometers (LAS) was evaluated with reference to an eddy covariance (EC) system over relatively flat and uniform grassland near Timpas (CO, USA).
Other tests have revealed inherent variability between Kipp and Zonen LAS units and bias to overestimate H. Average H fluxes Cited by: 5. Full text of "Comparison of Large Aperture Scintillometer and Satellite-based Energy Balance Models in Sensible Heat Flux and Crop Evapotranspiration Determination" See other formats International Journal of Remote Sensing Applications URSA Comparison of Large Aperture Scintillometer and Satellite-based Energy Balance Models in Sensible Heat Flux and Crop.
System components and setup and maintenance are more demanding for the radio wave scintillometer; therefore, this type of instrument has been used in only a few studies [Meijninger et al., ].
Details A second-generation large-aperature scintillometer EPUB
The challenge in using a large‐aperture scintillometer for determining latent heat fluxes is defining available energy, an issue central to this by: Accurate estimation of evaporation (E0) over open water bodies in arid regions (e.g., lakes in the desert) is of great importance for local water resource management.
Due to the ability to accurately determine sensible (H) and latent (LE) heat fluxes over scales of hundreds to thousands of meters, scintillometers are more and more appreciated.
In this study, a scintillometer Author: Peng-Fei Han, Xu-Sheng Wang, Jun-Zhi Wang. To test the applicability of the scintillation method over a heterogeneous area an experiment was carried out in the summer of in Flevoland (The Netherlands).
In the patchy area only four crops were grown namely sugar beet, potatoes, wheat and onions. From eddy covariance measurements it was found that the heterogeneity was mainly caused by Cited by: A Large Aperture Scintillometer BLS Dual-Disk Design.
Description A second-generation large-aperature scintillometer FB2
A Path Reduction Aperture for BLS to reduce path length down to m. Details Accessories. A Large Aperture Scintillometer BLS Dual-Disk Design. Details Accessories.
A Path Reduction Aperture for BLS A large aperture scintillometer (LAS) is an instrument that consists of a transmitter and a receiver.
The receiver measures intensity, I, fluctuations in the radiation emitted by the transmitter caused by refractive scattering by turbulent eddies in the LAS path. For LAS, the observed intensity fluctuations are a measure of the. Attenuating absorption contribution on Cn2 estimates with a large-aperture scintillometer Pierre Adrien Solignac, Aurore Brut, Jean-Louis Selves, Jean-Pierre B eteille, Jean-Philippe Gastellu-Etchegorry To cite this version: Pierre Adrien Solignac, Aurore Brut, Jean-Louis Selves, Jean-Pierre B eteille, Jean-Philippe Gastellu-Etchegorry.
The Large Aperture Scintillometer(LAS) has been developed in the ’s (Wang et al., ). It has been applied to measure a number of atmospheric surface layer quantities, most notably the structure function parameter of the refractive index, Cn2 (Ochs and Wang, ), the wind speed across the scintillometer.
Abstract: Evapotranspiration (ET) is one of the key variables in the water and energy exchange between land surface and atmosphere. This paper develops an end-member-based two-source approach for estimating land surface ET (i.e., the ESVEP model) from remote sensing data, considering the differing responses of soil water content at the upper surface layer to soil Cited by: However they differ in the approach to calculate H.
Since ET is determined as a residual in the EB equation, the accurate estimation of H becomes critical. The objective of the study was to assess the RS estimates of H with H measured using a Large Aperture Scintillometer (LAS). Further comparison was done for ET.
Physical principles and design criteria for a large-aperture scintillometer conceived at the NOAA Wave Propagation Laboratory in Boulder, Colorado are presented.
This instrument measures intensity fluctuations of a collimated beam of incoherent light at spatial wavelengths within the inertial subrange.
Together with measurements of mean windspeed and rule-of-thumb. The Large Aperture Scintillometer (LAS) workshop, held November th,is a comprehensive 2-day workshop, in which the LAS MkII is examined and the data from a field comparison to Eddy Covariance instrumentation is reviewed.
The workshop will also include a hands on component with the related equipment.Comparison of Large Aperture Scintillometer and Satellite-based Energy Balance Models in Sensible Heat Flux and Crop Evapotranspiration Determination Mcebisi Mkhwanazi1, José L. Chávez2, Evan H.The Large Aperture Scintillometer (LAS) and eXtra Large Aperture Scintillometer (X-LAS) are instruments designed for measuring the path-averaged structure parameter of the refractive index of air (Cn2) over horizontal paths of several kilometers.
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