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Main Title: GNSS-based water vapor estimation and validation during the MOSAiC expedition
Author(s): Männel, Benjamin
Zus, Florian
Dick, Galina
Glaser, Susanne
Semmling, Maximilian
Balidakis, Kyriakos
Wickert, Jens
Maturilli, Marion
Dahlke, Sandro
Schuh, Harald
Type: Article
Abstract: Within the transpolar drifting expedition MOSAiC (Multidisciplinary drifting Observatory for the Study of Arctic Climate), the Global Navigation Satellite System (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 (ZTDs) were determined using a kinematic precise point positioning (PPP) approach. The derived ZTD values agree to 1.1 ± 0.2 mm (root mean square (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.
Subject(s): MOSAiC expedition
Multidisciplinary drifting Observatory for the Study of Arctic Climate
Global Navigation Satellite System
atmospheric water vapor
Issue Date: 28-Jul-2021
Date Available: 21-Sep-2021
Language Code: en
DDC Class: 550 Geowissenschaften
Journal Title: Atmospheric Measurement Techniques
Publisher: Copernicus
Volume: 14
Issue: 7
Publisher DOI: 10.5194/amt-14-5127-2021
Page Start: 5127
Page End: 5138
EISSN: 1867-8548
ISSN: 1867-1381
TU Affiliation(s): Fak. 6 Planen Bauen Umwelt » Inst. Geodäsie und Geoinformationstechnik » FG Satellitengeodäsie
Appears in Collections:Technische Universität Berlin » Publications

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