Home About HyMeX
Motivations
Science questions
Observation strategy
Modelling strategy
Target areas
Key documents
Organisation
International coordination
Working groups
Task teams
National contributions
Endorsements
Resources
Database
Data policy
Publications
Education and summer schools
Drifting balloons (BAMED)
SOP web page
Google maps data visualisation
Workshops Projects
ASICS-MED
MOBICLIMEX
MUSIC
IODA-MED
REMEMBER
FLOODSCALE
EXAEDRE
Offers Links Contacts
Science & Task teams
Science teams
Task teams
Implementation plan
Coordination
International Scientific Steering Committee (ISSC)
Executive Committee for Implementation and Science Coordination (EC-ISC)
Executive Committee - France (EC-Fr)
HyMeX France
HyMeX Italy
HyMeX Spain
Archive
by Sauvage, C., Lebeaupin Brossier, C., Ducrocq, V., Bouin, M.N., Vincendon, B., Verdecchia, M., Taupier-Letage, I. and Orain, F.
Abstract:
The Western Mediterranean Sea is often affected by heavy precipitation which frequently generates floods or even flash floods. These events generally produce brief but major freshwater inputs in the ocean. In order to evaluate the sensitivity to the representation of river freshwater input, three different runoff forcing dataset are used to drive the NEMO ocean model: a monthly climatology, an observational dataset with a daily or a hourly frequency. The sensitivity is investigated over the first Special Observation Period (SOP1) of the HyMeX program that took place in autumn 2012, in two configurations of NEMO: the first is WMED36 over the Western Mediterranean Sea at 1/36°-resolution and the second is a new configuration covering the North-Western Mediterranean Sea with a 1/72°-resolution named NWMED72. With NWMED72, the impact of the representation of the river freshwater flux, i.e. moving from a surface flux to a vertical distribution of the flux, is also evaluated. The results show that the ocean stratification is significantly modified locally in simulations where runoff observations are used compared to those using the climatology. The sea surface salinity is modified as well as the mixed layer which is thinner as bounded by a well marked halocline. The sea surface temperature is also impacted by the change in runoff frequency. Moreover, the current intensity in river plume during flood is increased. Vertical profiles of salinity and temperature and thus the mixed layer depth are changed when the runoff forcing is distributed over a depth. Those changes are limited and very local but the realism of the river runoff input is improved.
Reference:
Sauvage, C., Lebeaupin Brossier, C., Ducrocq, V., Bouin, M.N., Vincendon, B., Verdecchia, M., Taupier-Letage, I. and Orain, F., 2018: Impact of the representation of the freshwater river input in the Western Mediterranean SeaOcean Modelling, 131, 115 - 131.
Bibtex Entry:
@Article{Sauvage2018,
  Title                    = {Impact of the representation of the freshwater river input in the Western Mediterranean Sea},
  Author                   = {Sauvage, C. and Lebeaupin Brossier, C. and Ducrocq, V. and Bouin, M.N. and Vincendon, B. and Verdecchia, M. and Taupier-Letage, I. and Orain, F.},
  Journal                  = {Ocean Modelling},
  Year                     = {2018},

  Month                    = {November},
  Pages                    = {115 - 131},
  Volume                   = {131},

  Abstract                 = {The Western Mediterranean Sea is often affected by heavy precipitation which frequently generates floods or even flash floods. These events generally produce brief but major freshwater inputs in the ocean. In order to evaluate the sensitivity to the representation of river freshwater input, three different runoff forcing dataset are used to drive the NEMO ocean model: a monthly climatology, an observational dataset with a daily or a hourly frequency. The sensitivity is investigated over the first Special Observation Period (SOP1) of the HyMeX program that took place in autumn 2012, in two configurations of NEMO: the first is WMED36 over the Western Mediterranean Sea at 1/36°-resolution and the second is a new configuration covering the North-Western Mediterranean Sea with a 1/72°-resolution named NWMED72. With NWMED72, the impact of the representation of the river freshwater flux, i.e. moving from a surface flux to a vertical distribution of the flux, is also evaluated. The results show that the ocean stratification is significantly modified locally in simulations where runoff observations are used compared to those using the climatology. The sea surface salinity is modified as well as the mixed layer which is thinner as bounded by a well marked halocline. The sea surface temperature is also impacted by the change in runoff frequency. Moreover, the current intensity in river plume during flood is increased. Vertical profiles of salinity and temperature and thus the mixed layer depth are changed when the runoff forcing is distributed over a depth. Those changes are limited and very local but the realism of the river runoff input is improved.},
  Copublication            = {8: 7 Fr, 1 It},
  Doi                      = {https://doi.org/10.1016/j.ocemod.2018.09.005},
  ISSN                     = {1463-5003},
  Keywords                 = {Flood, Heavy precipitation, HyMeX, North-Western Mediterranean sea, River plumes, Runoff freshwater flux, Stratification},
  Owner                    = {hymexw},
  Timestamp                = {2018.09.27},
  Url                      = {http://www.sciencedirect.com/science/article/pii/S1463500318300957}
}