TY - JOUR T1 - Integrated water vapour content retrievals from ship-borne GNSS receivers during EUREC4A A1 - Bosser,Pierre A1 - Bock,Olivier A1 - Flamant,Cyrille A1 - Bony,Sandrine A1 - Speich,Sabrina AD - Lab-STICC/PRASYS UMR 6285 CNRS, ENSTA Bretagne / HOP, Brest, France AD - Université de Paris, Institut de physique du globe de Paris, CNRS, IGN, Paris, France AD - ENSG-Géomatique, IGN, F-77455 Marne-la-Vallée, France AD - LATMOS/IPSL, UMR 8190 CNRS, SU-UVSQ, Paris, France AD - LMD/IPSL, UMR 8539 CNRS, Sorbonne Université, UPMC, Paris, France AD - LMD/IPSL, UMR 8539 CNRS, ENS-Ecole Polytechnique-SU, Paris, France UR - https://archimer.ifremer.fr/doc/00654/76561/ DO - 10.5194/essd-2020-282 N2 - In the framework of the EUREC4A (Elucidating the role of clouds-circulation coupling in climate) campaign that took place in January and February 2020, integrated water vapour (IWV) contents were retrieved over the open Tropical Atlantic Ocean using Global Navigation Satellite Systems (GNSS) data acquired from three research vessels (R/Vs): R/V Atalante, R/V Maria S. Merian, and R/V Meteor. This paper describes the GNSS processing method and compares the GNSS IWV retrievals with IWV estimates from the European Center for Medium-range Weather Forecast (ECMWF) fifth ReAnalysis (ERA5), from the Moderate-Resolution Imaging Spectroradiometer (MODIS) infra-red products, and from terrestrial GNSS stations located along the tracks of the ships. The ship-borne GNSS IWVs retrievals from R/V Atalante and R/V Meteor compare well with ERA5, with small biases (−1.62 kg m−2 for R/V Atalante and +0.65 kg m−2 for R/V Meteor) and a root mean square (RMS) difference about 2.3 kg m−2. The results for the R/V Maria S. Merian are found to be of poorer quality, with RMS difference of 6 kg m−2 which are very likely due to the location of the GNSS antenna on this R/V prone to multipath effects. The comparisons with ground-based GNSS data confirm these results. The comparisons of all three R/V IWV retrievals with MODIS infra-red product show large RMS differences of 5–7 kg m−2, reflecting the enhanced uncertainties of this satellite product in the tropics. These ship-borne IWV retrievals are intended to be used for the description and understanding of meteorological phenomena that occurred during the campaign, east of Barbados, Guyana and northern Brazil. Both the raw GNSS measurements and the IWV estimates are available through the AERIS data center (https://en.aeris-data.fr/). The digital object identifiers (DOIs) for R/V Atalante IWV and raw datasets are https://doi.org/10.25326/71 (Bosser et al., 2020a) and https://doi.org/10.25326/74 (Bosser et al., 2020d), respectively. The DOIs for the R/V Maria S. Merian IWV and raw datasets are https://doi.org/10.25326/72 (Bosser et al., 2020b) and https://doi.org/10.25326/75 (Bosser et al., 2020e), respectively. The DOIs for the R/V Meteor IWV and raw datasets are https://doi.org/10.25326/73 (Bosser et al., 2020c) and https://doi.org/10.25326/76 (Bosser et al., 2020f), respectively. Y1 - 2021 PB - Copernicus GmbH JF - Earth System Science Data SN - 1866-3516 VL - 13 IS - 4 ID - 76561 ER -