Sensitivity testing of WRF parameterizations on air-sea interaction and its impact on water cycle in the Gulf of Guinea

Remi Meynadier 1, 2 Gaëlle de Coëtlogon 2 Sophie Bastin 3 Laurence Eymard 4 Serge Janicot 4
2 ESTER - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
3 SPACE - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
4 PARVATI - Processus de la variabilité climatique tropicale et impacts
LOCEAN - Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques
Abstract : A strong ocean–atmosphere coupling exists in the eastern equatorial region of the Tropical Atlantic at intraseasonal timescales, with a significant contribution in the functioning and partitioning of the water cycle in spring over the ocean, as well as later in the season over West Africa. Uncertainties in simulating the air-sea interaction in the Gulf of Guinea and its impact on the water cycle are studied using modeling experiments during spring-summer 2006 with the Weather Research and Forecasting model (WRF). Tested parameters include physical package of cumulus (Cu), planetary boundary layer (PBL), microphysics (MP) and radiative (RAD) schemes. The simulations are compared with satellite-based observations, ship-based radiosonde data and the state of art of atmospheric model reanalyses. Results show that Cumulus, Microphysics and Radiatives parameterizations exert a large influence in the simulated seasonal distribution of regional convective rainfall. Non-local PBL schemes are determinant to simulate the correct surface wind pattern and water vapor distribution in order to get realistic precipitation from intra-seasonal to diurnal scales, especially over the ocean where the nocturnal rainfall representation is improved.
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Submitted on : Tuesday, October 21, 2014 - 1:55:52 PM
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Remi Meynadier, Gaëlle de Coëtlogon, Sophie Bastin, Laurence Eymard, Serge Janicot. Sensitivity testing of WRF parameterizations on air-sea interaction and its impact on water cycle in the Gulf of Guinea. Quarterly Journal of the Royal Meteorological Society, Wiley, 2015, 141 (690), pp.1804-1820. ⟨10.1002/qj.2483⟩. ⟨hal-01076178⟩

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