Impact of improved soil moisture on the ECMWF precipitation forecast in West Africa

[1] West Africa is a region of strong coupling between soil moisture and precipitation and where numerical weather prediction of precipitation generally exhibits poor skill. This region has been the focus of the African Monsoon Multidisciplinary Analysis - Land-surface Model Intercomparison Project in which the European Medium-Range Weather Forecasts (ECMWF) land surface scheme—among others—has been driven offline by accurate meteorological forcing in order to produce improved soil moisture estimates. The impact of these improved initial conditions for soil moisture on the short-range precipitation forecast is examined with the ECMWF Integrated Forecast System. While direct and beneficial impact of a more realistic soil moisture is obtained for accumulated precipitation in the regions over the coast of the Gulf of Guinea and eastern Sahel, over the rest of the Sahel the impact is detrimental or neutral.

[1]  D. Lawrence,et al.  Regions of Strong Coupling Between Soil Moisture and Precipitation , 2004, Science.

[2]  C. Taylor,et al.  An observational case study of mesoscale atmospheric circulations induced by soil moisture , 2007 .

[3]  Catherine Ottlé,et al.  The AMMA Land Surface Model Intercomparison Project (ALMIP) , 2007 .

[4]  C. Bretherton,et al.  The Soil Moisture–Precipitation Feedback in Simulations with Explicit and Parameterized Convection , 2009 .

[5]  Iliana Genkova,et al.  Impacts of Assimilating AMMA Soundings on ECMWF Analyses and Forecasts , 2010 .

[6]  B. Hurk,et al.  Diagnosing Land–Atmosphere Interaction from a Regional Climate Model Simulation over West Africa , 2010 .

[7]  C. Thorncroft,et al.  African Monsoon Multidisciplinary Analysis: An International Research Project and Field Campaign , 2006 .

[8]  B. Hurk,et al.  A Revised Hydrology for the ECMWF Model: Verification from Field Site to Terrestrial Water Storage and Impact in the Integrated Forecast System , 2009 .

[9]  Elfatih A. B. Eltahir,et al.  Atmospheric Controls on Soil Moisture-Boundary Layer Interactions. Part II: Feedbacks within the Continental United States , 2003 .

[10]  C. Taylor,et al.  Satellite detection of soil moisture impacts on convection at the mesoscale , 2006 .

[11]  N. Kalthoff,et al.  Sensitivity of a modelled life cycle of a mesoscale convective system to soil conditions over West Africa , 2010 .

[12]  J. Willebrand,et al.  African Monsoon Multidisciplinary Analysis ( AMMA ) : An International Research Project and Field Campaign , 2022 .

[13]  Intraseasonal Land–Atmosphere Coupling in the West African Monsoon , 2008 .

[14]  Christopher M. Taylor,et al.  Impact of soil moisture on the development of a Sahelian mesoscale convective system: a case‐study from the AMMA Special Observing Period , 2010 .

[15]  K. Findell.  Atmospheric Controls on Soil Moisture-Boundary Layer Interactions , 2001 .

[16]  Jean-Luc Redelsperger,et al.  Radiosonde humidity bias correction over the West African region for the special AMMA reanalysis at ECMWF , 2009 .

[17]  Jean-Jacques Morcrette,et al.  The ECMWF re‐analysis for the AMMA observational campaign , 2010 .