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The Darwin TCCON site and co-located Picarro instrument provides a unique opportunity to study both how tropical hydrological processing effects stable isotopes and assess the accuracy of the Darwin dD TCCON measurements. This paper analyses the added value from isotopic measurements for interpreting tropical hydrology in wet and dry seasons. We examine the roles that different dehydration processes influence the local hydrology. In addition we use in-situ measurements to assess the accuracy of dD TCCON retrievals and and determine how uncertainty influences the intepretation of seasonal cycle and atmospheric hydrological processing. Finally we examine the agreement between the modelled surface and column datasets and determine if they are sensitive to the hydrological processes observed in the in-situ surface observations.  Investigate smoothing for TCCON dD  dD from in-situ combined with Rayleigh model for a priori profile (is it better than ocean equilibrium + Rayleigh)  Do models and remote sensing observe the same hydrological processing as in-situ?