Determination of Area-Averaged Sensible Heat Fluxes with a Large Aperture Scintillometer over a Heterogeneous Surface – Flevoland Field Experiment

2002 ◽  
Vol 105 (1) ◽  
pp. 37-62 ◽  
Author(s):  
W. M. L. Meijninger ◽  
O. K. Hartogensis ◽  
W. Kohsiek ◽  
J. C. B. Hoedjes ◽  
R. M. Zuurbier ◽  
...  
Keyword(s):  
Field Experiment ◽  
Heat Fluxes ◽  
Heterogeneous Surface ◽  
Sensible Heat ◽  
Large Aperture ◽  
Large Aperture Scintillometer

scholarly journals DIURNAL VARIATIONS OF SENSIBLE HEAT FLUXES OVER YATSU TIDAL FLAT IN SUMMER USING LARGE APERTURE SCINTILLOMETER

2013 ◽  
Vol 69 (2) ◽  
pp. I_1012-I_1017
Author(s):  
Ryoko ODA ◽  
Yuta BANNAI ◽  
Yusuke BANBA ◽  
Hiroaki TAKAOKA ◽  
Manabu NIHEI ◽  
...  
Keyword(s):  
Tidal Flat ◽  
Diurnal Variations ◽  
Heat Fluxes ◽  
Sensible Heat ◽  
Large Aperture ◽  
Large Aperture Scintillometer

scholarly journals A comparison of eddy-covariance and large aperture scintillometer measurements with respect to the energy balance closure problem

2011 ◽  
Vol 15 (4) ◽  
pp. 1291-1306 ◽  
Author(s):  
S. M. Liu ◽  
Z. W. Xu ◽  
W. Z. Wang ◽  
Z. Z. Jia ◽  
M. J. Zhu ◽  
...  
Keyword(s):  
Heat Flux ◽  
Energy Balance ◽  
Eddy Covariance ◽  
Energy Budget ◽  
Seasonal Variations ◽  
Heat Fluxes ◽  
Sensible Heat ◽  
Source Areas ◽  
Large Aperture ◽  
Large Aperture Scintillometer

Abstract. We analyzed the seasonal variations of energy balance components over three different surfaces: irrigated cropland (Yingke, YK), alpine meadow (A'rou, AR), and spruce forest (Guantan, GT). The energy balance components were measured using eddy covariance (EC) systems and a large aperture scintillometer (LAS) in the Heihe River Basin, China, in 2008 and 2009. We also determined the source areas of the EC and LAS measurements with a footprint model for each site and discussed the differences between the sensible heat fluxes measured with EC and LAS at AR. The results show that the main EC source areas were within a radius of 250 m at all of the sites. The main source area for the LAS (with a path length of 2390 m) stretched along a path line approximately 2000 m long and 700 m wide. The surface characteristics in the source areas changed with the season at each site, and there were characteristic seasonal variations in the energy balance components at all of the sites. The sensible heat flux was the main term of the energy budget during the dormant season. During the growing season, however, the latent heat flux dominated the energy budget, and an obvious "oasis effect" was observed at YK. The sensible heat fluxes measured by LAS at AR were larger than those measured by EC at the same site. This difference seems to be caused by the so-called energy imbalance phenomenon, the heterogeneity of the underlying surfaces, and the difference between the source areas of the LAS and EC measurements.

Determination of Area-Averaged Water Vapour Fluxes with Large Aperture and Radio Wave Scintillometers over a Heterogeneous Surface – Flevoland Field Experiment

2002 ◽  
Vol 105 (1) ◽  
pp. 63-83 ◽  
Author(s):  
W. M. L. Meijninger ◽  
A. E. Green ◽  
O. K. Hartogensis ◽  
W. Kohsiek ◽  
J. C. B. Hoedjes ◽  
...  
Keyword(s):  
Field Experiment ◽  
Radio Wave ◽  
Water Vapour ◽  
Heterogeneous Surface ◽  
Large Aperture ◽  
Water Vapour Fluxes

Determination of turbulent heat fluxes using a large aperture scintillometer over undulating mixed agricultural terrain

2012 ◽  
Vol 166-167 ◽  
pp. 221-233 ◽  
Author(s):  
J.G. Evans ◽  
D.D. McNeil ◽  
J.W. Finch ◽  
T. Murray ◽  
R.J. Harding ◽  
...  
Keyword(s):  
Heat Fluxes ◽  
Turbulent Heat ◽  
Large Aperture ◽  
Large Aperture Scintillometer ◽  
Turbulent Heat Fluxes

scholarly journals Estimation of catchment averaged sensible heat fluxes using a large aperture scintillometer

2011 ◽  
Vol 47 (5) ◽  
Author(s):  
Bruno Samain ◽  
Bram V. A. Ferket ◽  
Willem Defloor ◽  
Valentijn R. N. Pauwels
Keyword(s):  
Heat Fluxes ◽  
Sensible Heat ◽  
Large Aperture ◽  
Large Aperture Scintillometer

scholarly journals Comparison of Large Aperture Scintillometer and Eddy Covariance Measurements: Can Thermal Infrared Data Be Used to Capture Footprint-Induced Differences?

2007 ◽  
Vol 8 (2) ◽  
pp. 144-159 ◽  
Author(s):  
J. C. B. Hoedjes ◽  
A. Chehbouni ◽  
J. Ezzahar ◽  
R. Escadafal ◽  
H. A. R. De Bruin
Keyword(s):  
Spatial Variability ◽  
Eddy Covariance ◽  
Thermal Infrared ◽  
Heat Fluxes ◽  
Sensible Heat ◽  
Soil Humidity ◽  
Large Aperture ◽  
Large Aperture Scintillometer ◽  
Surface Temperatures ◽  
The Difference

Abstract 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 large. This heterogeneity caused large differences between the source area characteristics of the EC system and the LAS, resulting in a large scatter when comparing sensible heat fluxes obtained from LAS and EC. Radiative surface temperatures were retrieved from thermal infrared satellite images from the Landsat Enhanced Thematical Mapper+ and Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) satellites. Using these images in combination with an analytical footprint model, footprint-weighted radiative surface temperatures for the footprints of the LAS and the EC system were calculated. Comparisons between the difference in measured sensible heat fluxes and the difference in footprint-weighted radiative surface temperature showed that for differences between the footprint-weighted radiative surface temperatures larger than ±0.5 K, correlations with the difference in measured sensible heat flux were good. It was found that radiative surface temperatures, obtained from thermal infrared satellite imagery, can provide a good indication of the spatial variability of soil humidity, and can be used to identify differences between LAS and EC measurements of sensible heat fluxes resulting from this variability.

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