Читать книгу Congo Basin Hydrology, Climate, and Biogeochemistry - Группа авторов - Страница 53

The study aims to assess the local response of the regional climate model version 4.6 (RegCM4.6) to the coupling of ocean–atmosphere interaction in Central Africa. The ability of the model was evaluated over six years (1 January 2001 to 31 December 2006) by conducting two different experiments with the Grell convective scheme. The experiments were carried out monthly with a spatial resolution of 40 km. The model was forced by ERA‐Interim reanalyses and validated by GPCP (Global Precipitation Climatology Project) observational data, ERA 5 and ERA‐Interim reanalyses. To evaluate the influence of the “slab‐ocean,” we carried out two different experiments: The first experiment was designed to produce the climatology and force the surface limits of RegCM with the sea surface temperature. The second experiment was designed to couple RegCM with the “slab‐ocean,” which provides mutual interaction between the ocean and the atmosphere. Using statistical tools, we evaluated the model’s ability to simulate precipitation, surface temperature, and wind. Both experiments reasonably reproduced the main characteristics of the rainfall regime, temperature, and wind. A comparative analysis of the different experiments revealed that the performances of the experiments were similar in Central Africa and in the different homogeneous sub‐regions as far as rainfall is concerned, but there were subtle differences. Slab‐ocean improvement varied from season to season and from sub‐region to sub‐region. However, we noted a significant improvement in temperature and rainfall over the Indian Ocean.