Precipitable water vapour content from ESR/SKYNET sun–sky radiometers: validation against GNSS/GPS and AERONET over three different sites in Europe - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Article Dans Une Revue Atmospheric Measurement Techniques Année : 2018

Precipitable water vapour content from ESR/SKYNET sun–sky radiometers: validation against GNSS/GPS and AERONET over three different sites in Europe

Monica Campanelli
  • Fonction : Auteur
Alessandra Mascitelli
  • Fonction : Auteur
Paolo Sanò
  • Fonction : Auteur
Henri Diémoz
  • Fonction : Auteur
Victor Estellés
  • Fonction : Auteur
Stefano Federico
  • Fonction : Auteur
Anna Maria Iannarelli
  • Fonction : Auteur
Francesca Fratarcangeli
  • Fonction : Auteur
Augusto Mazzoni
  • Fonction : Auteur
Eugenio Realini
  • Fonction : Auteur
Mattia Crespi
  • Fonction : Auteur
Jose Martínez-Lozano
  • Fonction : Auteur
Stefano Dietrich
  • Fonction : Auteur

Résumé

The estimation of the precipitable water vapour content (W) with high temporal and spatial resolution is of great interest to both meteorological and climatological studies. Several methodologies based on remote sensing techniques have been recently developed in order to obtain accurate and frequent measurements of this atmospheric parameter. Among them, the relative low cost and easy deployment of sun-sky radiometers, or sun photometers, operating in several international networks, allowed the development of automatic estimations of W from these instruments with high temporal resolution. However, the great problem of this methodology is the estimation of the sun-photometric calibration parameters. The objective of this paper is to validate a new methodology based on the hypothesis that the calibration parameters characterizing the atmospheric transmit-tance at 940 nm are dependent on vertical profiles of temperature , air pressure and moisture typical of each measurement site. To obtain the calibration parameters some simultaneously seasonal measurements of W , from independent sources, taken over a large range of solar zenith angle and covering a wide range of W , are needed. In this work yearly GNSS/GPS datasets were used for obtaining a table of pho-tometric calibration constants and the methodology was applied and validated in three European ESR-SKYNET network sites, characterized by different atmospheric and climatic conditions: Rome, Valencia and Aosta. Results were validated against the GNSS/GPS and AErosol RObotic NETwork (AERONET) W estimations. In both the validations the agreement was very high, with a percentage RMSD of about 6, 13 and 8 % in the case of GPS intercomparison at Rome, Aosta and Valencia, respectively, and of 8 % in the case of AERONET comparison in Valencia. Analysing the results by W classes, the present methodology was found to clearly improve W estimation at low W content when compared against AERONET in terms of % bias, bringing the agreement with the GPS (considered the reference one) from a % bias of 5.76 to 0.52.
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Dates et versions

insu-02957038 , version 1 (04-10-2020)

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Monica Campanelli, Alessandra Mascitelli, Paolo Sanò, Henri Diémoz, Victor Estellés, et al.. Precipitable water vapour content from ESR/SKYNET sun–sky radiometers: validation against GNSS/GPS and AERONET over three different sites in Europe. Atmospheric Measurement Techniques, 2018, 11 (1), pp.81-94. ⟨10.5194/amt-11-81-2018⟩. ⟨insu-02957038⟩
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