Preprints
https://doi.org/10.5194/amt-2021-79
https://doi.org/10.5194/amt-2021-79

  08 Apr 2021

08 Apr 2021

Review status: this preprint is currently under review for the journal AMT.

GNSS-based water vapor estimation and validation during the MOSAiC expedition

Benjamin Männel1, Florian Zus1, Galina Dick1, Susanne Glaser1, Maximilian Semmling2, Kyriakos Balidakis1, Jens Wickert1,3, Marion Maturilli4, Sandro Dahlke4, and Harald Schuh1,5 Benjamin Männel et al.
  • 1GFZ German Research Centre for Geosciences, Telegrafenberg, Potsdam, Germany
  • 2DLR-SO Institute for Solar-Terrestrial Physics, Neustrelitz, Germany
  • 3Technische Universität Berlin, Chair GNSS Remote Sensing, Navigation, and Positioning, Berlin, Germany
  • 4Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany
  • 5Technische Universität Berlin, Chair Satellite Geodesy, Berlin, Germany

Abstract. Within the transpolar drifting expedition MOSAiC (Multidisciplinary drifting Observatory for the Study of Arctic Climate), GNSS was used among other techniques to monitor variations in atmospheric water vapor. Based on 15 months of continuously tracked GNSS data including GPS, GLONASS, and Galileo, epoch-wise coordinates and hourly zenith total delays (ZTD) were determined using a kinematic precise point positioning (PPP) approach. The derived ZTD values agree to 1.1 ± 0.2 mm (RMS of the differences 10.2 mm) with the numerical weather data of ECMWF’s latest reanalysis, ERA5, computed for the derived ship’s locations. This level of agreement is also confirmed by comparing the on-board estimates with ZTDs derived for terrestrial GNSS stations in Bremerhaven and Ny Ålesund and for the radio telescopes observing Very Long Baseline Interferometry in Ny Ålesund. Preliminary estimates of integrated water vapor derived from frequently launched radiosondes are used to assess the GNSS-derived integrated water vapor estimates. The overall difference of 0.08 ± 0.04 kg m−2 (RMS of the differences 1.47 kg m−2) demonstrates a good agreement between GNSS and radiosonde data. Finally, the water vapor variations associated with two warm air intrusion events in April 2020 are assessed.

Benjamin Männel et al.

Status: open (until 03 Jun 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2021-79', Anonymous Referee #1, 16 Apr 2021 reply

Benjamin Männel et al.

Benjamin Männel et al.

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Short summary
Within the MOSAiC expedition, GNSS was used to monitor variations in atmospheric water vapor. Based on 15 months of continuously tracked data, coordinates and hourly zenith total delays (ZTD) were determined using kinematic precise point positioning. The derived ZTD values agree within few millimeters to ERA5 and terrestrial GNSS and VLBI stations. The derived integrated water vapor corresponds to the frequently launched radiosondes (0.08 ± 0.04 kg m−2, RMS of the differences 1.47 kg m−2).