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\section{Proposal}  \subsection{Broad Aims}  The overall broad aim of the isotope work to be completed at Todhia is to use the isotope measurements to provide additional information about the local hydrological cycle that standard measurements can not. The obvious area of interest is partitioning ET into component fluxes. The  focus will be to determine the added value for the exchange of water between the crop ecosystem and the atmosphere. UAV's/Quadcopter (surface temperature, leaf water content)??  Beyond this, I will be aiming to collect a dataset that can be used to test isotopic models and potential constrain other hydrological models suing the isotopic observations. Some of these models relate to:  \begin{itemize}  \item leaf water transport  \item transport of the water vapour from the leaf, through the leaf boundary layer, canopy, roughness layer and into the turbulent atmosphere (C-G model and resistance parameterisation)  \item evaporation from the soil - resistance paremterisation parameterisation  and testing C-G model \end{itemize}  To address these aims, data that provides information about the transport of energy, momentum and water between the crop and the atmosphere is required. In particular profile measurements made from a tower will provide the basis of our measurement campaign - using Eddy covariance measurements, and vertically resolved meteorology and isotopes. The profile measurements should be complemented by additional measurements of leaf water content, water input (and isotopes), leaf water isotopes, soil water isotopes (vertically resolved). A potential interesting application could be to use the UAV or Quadcopter to measure leaf water content and leaf temperature and determine how an flux weighted area average improves the representation of isotopes in C-G model and additional parameterisation.