Congo Basin Hydrology, Climate, and Biogeochemistry. Группа авторов

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Название Congo Basin Hydrology, Climate, and Biogeochemistry
Автор произведения Группа авторов
Жанр География
Серия
Издательство География
Год выпуска 0
isbn 9781119656999



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(m–p)."/> Schematic illustration of seasonal mean biases of precipitation in mm/day for the period 2001–2006: ARC2 - GPCP (a–d), GFC_SLAB - GPCP (e–h), GFC_CTR - GPCP (i–l), GFC_SLAB - GFC_CTR (m–p).

      4.3.2. Taylor Diagram

      4.3.3. Seasonal Cycles of Temperature and Rainfall

Schematic illustration of Taylor diagrams for area-averaged seasonal precipitation over North Central Africa (NCA), South Central Africa (SCA), West Equatorial (WE), East Equatorial (EE) and Central Africa (CA) for the period 2001–2006. Schematic illustration of seasonal rainfall cycle (mm/day) and monthly temperatures (°C) in the four sub-regions for the period 2001 to 2006 for data: ARC2, GPCP, ERA 5, CRU, ERA-Interim, and the different experiments shaded in grey, range of variation delimited by +/– standard deviation of the observation data.

      The WE and EE sub‐regions present a bimodal rainfall pattern with a maximum in April and October, as noted by the majority of studies conducted in the region (Fotso‐Kamga et al., 2020; Fotso‐Nguemo et al., 2017; Nicholson et al., 2018; Pokam et al., 2014; Taguela et al., 2020; Tamoffo et al., 2019; Vondou & Haensler, 2017). The experiments manage to capture the maxima and minima, but with biases of 2 mm/day on average around April and October. As far as temperature is concerned, we observe a bias of 1 °C with the observation data. The experiments tend to capture the maximum but fail to capture the minimum temperature observed with a difference of 3 °C around January.

      The SCA subzone shows a peak rainfall of about 6 mm/day, which is reached between November and March during the monsoon season. The experiments reasonably reproduce the seasonality of the rains in this sub‐region, but with a slight overestimation. As far as temperature is concerned, we observe a slight bias of about 1 °C between the observation data. The experiments manage to capture the modulations of the maximum at the beginning of the year but fail to represent their amplitude (with a bias of about 3 °C). Generally speaking, the experiments more or less represent the annual cycle of rainfall and temperature. It should be noted that the seasonal temperature cycles of the different experiments are outside the range of variability observed in the different sub‐zones. A comparative analysis of the different experiments reveals that the slab‐ocean experiment is best in the SCA subzone for rainfall and all subzones for temperature. It can be said that slab‐ocean parameterization or ocean–atmosphere coupling has slightly improved the performance of the RegCM model in the SCA zone for rainfall and all sub‐region about temperature, although it is underestimated.

      4.3.4. Regional Circulation

Schematic illustration of spatial and seasonal distributions at 925 hPa of zonal wind in colour (m/s) and wind intensity (in m/s vector) for the period 2001–2006 of ERA5 and the 
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