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Poster
GNSS tomography as part of HyMeX in the frame of HyMeX
Abstract : HyMeX (HYdrological cycle in the Mediterranean EXperiment) aims at a better understanding and
quantification of the hydrological cycle and related processes in the Mediterranean, notably with
emphasis on high-impact weather events.
This study investigates the interest of GNSS tomography for nowcasting. For this purpose, the 3D
field of water vapour density is retrieved (resolution of 10 km and 0.5 km, respectively horizontally
and vertically) for 23 days of Autumn 2012, covering 6 intensive observation periods during severe
weather events. An optimal strategy in tomography process developed in the frame of the COST
action ES1206 (GNSS4SWEC - Advanced Global Navigation Satellite Systems tropospheric products
for monitoring severe weather events and climate) is used for the permanent GNSS network
considered (about 130 stations with a mean baseline of 30 km). The sensitivity to the model a priori,
which is needed to initialize the tomographic retrievals, is investigated by considering both analyses
and very-short-term (3-h) forecasts from a high resolution numerical weather prediction system (i.e.
the 3DVAR data assimilation system AROME-WMED; its domain covers the western Mediterranean
area and additional observations available during HyMeX field campaigns are assimilated). The
additional information provided by GNSS tomography in comparison to these forecasts is presented.
https://hal.archives-ouvertes.fr/hal-01517506
Contributeur : Pierre Bosser <>
Soumis le : mercredi 3 mai 2017 - 12:36:19
Dernière modification le : mercredi 24 juin 2020 - 16:19:51
Archivage à long terme le : : vendredi 4 août 2017 - 12:53:27
Contributeur : Pierre Bosser <>
Soumis le : mercredi 3 mai 2017 - 12:36:19
Dernière modification le : mercredi 24 juin 2020 - 16:19:51
Archivage à long terme le : : vendredi 4 août 2017 - 12:53:27
Fichier
EGU_2017_tomoHyMeX.pdf
Fichiers produits par l'(les) auteur(s)