Assessing the simulation of snowfall at Dumont d'Urville, Antarctica, during the <scp>YOPP‐SH</scp> special observing campaign - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Quarterly Journal of the Royal Meteorological Society Année : 2023

Assessing the simulation of snowfall at Dumont d'Urville, Antarctica, during the YOPP‐SH special observing campaign

Résumé

The performance of a set of atmospheric models and meteorological reanalyses in the representation of precipitation days in Antarctica is assessed using ground-based observations such as a precipitation gauge and a Micro Rain Radar during the Year Of Polar Prediction Special Observing Period at Dumont d'Urville (November 2018 - February 2019), East Antarctic coast. The occurrence of precipitation is overall well predicted but the number of days and intensity with snowfall are overestimated by the models. This is reflected by high values of bias, probability of detection and false alarm ratios, in particular for reanalyses, due to too frequent simulated precipitating days. The Heidke skill score shows the overall great contribution of the models in the forecasting of precipitating days, and the best performances are achieved by numerical weather prediction models. The chronology is better represented when the models benefit from the data assimilation of in-situ observations, such as in reanalysis or weather forecasting models. Precipitation amounts at the surface are overestimated by most of the models. In addition, data from a ground-based radar make it possible to evaluate the representation of the vertical profiles of snowfall rate. We can show that an excessive sublimation in the atmospheric boundary layer can compensate for overly strong precipitation flux in the mid and low troposphere. Therefore the need to expand the measurement of precipitation across the atmospheric column using radars is highlighted, in particular in Antarctica where the cold cloud microphysics is poorly known and observations are particularly rare.

Domaines

Météorologie
Fichier principal
Vignette du fichier
Quart J Royal Meteoro Soc - 2023 - Roussel - Assessing the simulation of snowfall at Dumont d Urville Antarctica during.pdf (2.03 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-04087230 , version 1 (03-05-2023)

Identifiants

Citer

Marie‐laure Roussel, Valentin Wiener, Christophe Genthon, Etienne Vignon, Eric Bazile, et al.. Assessing the simulation of snowfall at Dumont d'Urville, Antarctica, during the YOPP‐SH special observing campaign. Quarterly Journal of the Royal Meteorological Society, 2023, 149 (753), pp.1391-1406. ⟨10.1002/qj.4463⟩. ⟨hal-04087230⟩
59 Consultations
27 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More