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Assessment of large aperture scintillometry for large-area surface energy fluxes over an irrigated cropland in north India

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Abstract

Amount of available net energy and its partitioning into sensible, latent and soil heat fluxes over an agricultural landscape are critical to improve estimation of evapotranspiration and modelling parse (ecosystem modelling, hydrological and meteorological modelling). Scintillometry is a peculiar and robust methodology to provide structure parameter of refractive index and energy balance. Scintillometer has proven for assessment of sensible and latent heat flux, which is based on the principle of Monin–Obukhov similarity theory. Scintillometer has been installed in the agricultural experimental farm of ICAR-Indian Agricultural Research Institute, New Delhi, with a spatial covering path length of 990 m of irrigated and cultivable agricultural landscape. This paper discusses the patterns of energy flux as diurnal and seasonal basis at scintillometer path which was mainly covered by maize in Kharif and wheat in Rabi season during a crop growing seasons of 2014–2015. The biophysical parameters (leaf area, soil moisture, crop height) were recorded at a temporal resolution of fortnight basis along the path length at usual sampling distance. The Bowen ratio value for both Kharif and Rabi season was 0.76 and 0.88, respectively by scintillometer. Leaf area index had a significantly positive correlation with latent heat flux (\(R^{2} =0.80\)) while a significantly negative correlation with sensible heat flux (\(R^{2}{=}-0.79\)). Soil moisture had a significant negative correlation with sensible heat flux (\(R^{2}{=}-0.68\)). The average evapotranspiration from crop land was \(1.58 ~\hbox {mm d}^{-1}\) and total evapotranspiration was 543 mm over the 12 months study period. This study defines that large aperture scintillometer is robust instrument which can evaluate energy flux over a large area with a long term series time domain. Moreover, further studied should be conducted to use in crop simulation modelling, developing of new model with calibration and validation of remote sensing energy balance algorithm, etc.

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Acknowledgements

This work has been carried out as a part of the collaborative project between Indian Institute of Remote Sensing (IIRS-ISRO), Dehradun and ICAR-Indian Agricultural Research Institute (ICAR-IARI), New Delhi. Authors acknowledge the support provided by Director, IIRS and Director, IARI for executing this collaborating project.

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Authors and Affiliations

  1. Division of Agricultural Physics, ICAR-Indian Agricultural Research Institute, New Delhi, 110 012, India

    Abhishek Danodia, V K Sehgal, R Dhakar & J Mukherjee

  2. Agriculture and Soils Division, Indian Institute of Remote Sensing – ISRO, Dehradun, 248 001, India

    Abhishek Danodia, N R Patel, S K Saha & A Senthil Kumar

Authors
  1. Abhishek Danodia
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  2. V K Sehgal
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  3. N R Patel
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  4. R Dhakar
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  5. J Mukherjee
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  6. S K Saha
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  7. A Senthil Kumar
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Correspondence to Abhishek Danodia.

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Corresponding editor: Ashok Karumuri

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Danodia, A., Sehgal, V.K., Patel, N.R. et al. Assessment of large aperture scintillometry for large-area surface energy fluxes over an irrigated cropland in north India. J Earth Syst Sci 126, 69 (2017). https://doi.org/10.1007/s12040-017-0847-6

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  • DOI: https://doi.org/10.1007/s12040-017-0847-6

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