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Water vapour is a critical component of the Earth system.Techniques to acquire and improve measurements of atmospheric water vapourand its isotopes are under active development. This work presents a detailedintercomparison of water vapour total column measurements taken between 2006and 2014 at a Canadian High Arctic research site (Eureka, Nunavut).Instruments include radiosondes, sun photometers, a microwave radiometer, andemission and solar absorption Fourier transform infrared (FTIR) spectrometers. Closeagreement is observed between all combination of datasets, with meandifferences  ≤  1.0 kg m<sup>−2</sup> and correlation coefficients  ≥  0.98.The one exception in the observed high correlation is the comparison betweenthe microwave radiometer and a radiosonde product, which had a correlationcoefficient of 0.92.  A variety of biases affecting Eureka instruments are revealed and discussed.A subset of Eureka radiosonde measurements was processed by the GlobalClimate Observing System (GCOS) Reference Upper Air Network (GRUAN) for thisstudy. Comparisons reveal a small dry bias in the standard radiosondemeasurement water vapour total columns of approximately 4 %. A recentlyproduced solar absorption FTIR spectrometer dataset resulting from the MUSICA(MUlti-platform remote Sensing of Isotopologues for investigating the Cycleof Atmospheric water) retrieval technique is shown to offer accuratemeasurements of water vapour total columns (e.g. average agreement within−5.2 % of GRUAN and −6.5 % of a co-located emission FTIR spectrometer). However,comparisons show a small wet bias of approximately 6 % at thehigh-latitude Eureka site. In addition, a new dataset derived fromAtmospheric Emitted Radiance Interferometer (AERI) measurements is shown toprovide accurate water vapour measurements (e.g. average agreement waswithin 4 % of GRUAN), which usefully enables measurements to be takenduring day and night (especially valuable during polar night)

Intercomparison of atmospheric water vapour measurements at a Canadian High Arctic site