[1149] - Diurnal Dynamics of Wheat Evapotranspiration Derived from 7 Ground-Based Thermal Imagery

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Ahrends, H., Haseneder-Lind, R., Schween, J., Crewell, S., Stadler, A., Rascher, U., 2014. Diurnal Dynamics of Wheat Evapotranspiration Derived from 7 Ground-Based Thermal Imagery. Remote Sensing, 6 (10), 9775 - 9801. DOI: 10.3390/rs6109775.
Title(s):Main Title: Diurnal Dynamics of Wheat Evapotranspiration Derived from 7 Ground-Based Thermal Imagery
Description(s):Abstract: The latent heat flux, one of the key components of the surface energy balance, can be inferred from remotely sensed thermal infrared data. However, discrepancies between modeled and observed evapotranspiration are large. Thermal cameras might provide a suitable tool for model evaluation under variable atmospheric conditions. Here we evaluate the results from the Penman-Monteith, Surface Energy Balance and Bowen Ratio approaches, which estimate the diurnal course of latent heat fluxes at a ripe winter wheat stand using measured and modeled temperatures. Under overcast conditions models perform similar and radiometric image temperatures are linearly correlated with the inverted aerodynamic temperature. During clear sky conditions the temperature of the wheat ear layer could be used to predict daytime turbulent fluxes (Root Mean Squared Error and Mean Absolute Error: 20-35 W m-2, r2: 0.76-0.88) whereas spatially averaged temperatures caused underestimation of pre-noon and overestimation of afternoon fluxes. Errors are dependent on models’ ability to simulate diurnal hysteresis effects and largest during intermittent clouds due to the discrepancy between the timing of image capture and the time needed for the leaf-air-temperature gradient to adapt to changes in solar radiation. During such periods we suggest using modeled surface temperatures for temporal upscaling and the validation of image data.
Identifier(s):DOI: 10.3390/rs6109775
Relation(s):Has Version: URL: http://www.tr32db.uni-koeln.de/data.php?dataID=1093
Responsible Party
Creator(s):Author: Hella Ahrends
Author: Rainer Haseneder-Lind
Author: Jan Schween
Author: Susanne Crewell
Author: Anja Stadler
Author: Uwe Rascher
TR32 Topic:Vegetation
Related Sub-project(s):D2
Subject(s):CRC/TR32 Keywords: Evapotranspiration
File Details
File Name:Ahrends_et_al_2014.pdf
Data Type:Text
File Size:3273 kB (3.196 MB)
Date(s):Available: 2014-10-14
Mime Type:application/pdf
Data Format:PDF
Download Permission:OnlyTR32
General Access and Use Conditions:According to the TR32DB data policy agreement.
Access Limitations:According to the TR32DB data policy agreement.
Licence:TR32DB Data policy agreement
North:-no map data
Measurement Region:None
Measurement Location:--None--
Specific Informations - Publication
Source:Remote Sensing
Number Of Pages:27
Page Range:9775 - 9801
Metadata Details
Metadata Creator:Sandra Steinke
Metadata Created:2015-04-23
Metadata Last Updated:2015-04-23
Funding Phase:2
Metadata Language:English
Metadata Version:V40
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