Open AccessPredictive skill of North American Multi‐Model Ensemble seasonal forecasts for the climate rainfall over Central Africa
Author(s) -
Feudjio Tchinda Armand,
Tanessong Roméo Stève,
Mamadou Ossénatou,
Tchida Diffo Vanessa,
Djomou Yepdo Zephirin,
Chabi Orou Jean Bio
Publication year - 2022
Publication title -
meteorological applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 59
eISSN - 1469-8080
pISSN - 1350-4827
DOI - 10.1002/met.2074
Subject(s) - lead time , climatology , forecast skill , environmental science , ensemble average , ensemble forecasting , constraint (computer aided design) , scale (ratio) , lead (geology) , statistics , quality (philosophy) , observational study , meteorology , econometrics , mathematics , geography , economics , geology , operations management , geometry , cartography , geomorphology , philosophy , epistemology
This study evaluates the predictive performance of the North American Multi‐model Ensemble (NMME) over Central Africa (CA) using the historical rainfall data. The African Rainfall Climatology Version 2 (ARC2) is used as a substitute for reference observational data to examine the capability of 11 NMME and their NMME ensemble mean (MME) in simulating rainfall. Using the Kling‐Gupta efficiency (KGE), Taylor skill score (TSS), and Heidke skill score, the predictive evaluation of the models is performed from lead 0 to lead 5 of each season. The results show that the NMME models satisfactorily reproduce the bimodal and unimodal structure of rainfall in CA at the lead 0 level of different seasons: December–February (DJF), March–May (MAM), June–August (JJA), and September–November (SON). The pattern correlation coefficient (PCC) shows values of NMME and MME greater than ~0.69 and TSS > 0.60 for all four seasons. The MME presents a maximum in DJF ~ 0.96 between 0 and 1 month lead time. With the same time scale, just over 85 % of the NMME have a KGE between 0 and 0.42. It follows that as the forecast lead time increases, the PCC and TSS of each model become small, with PCC ~ 0.12 in JJA and DJF, TSS < 0.21 in JJA at lead 5. The NMME models exhibit an important rainfall bias and the calculated scores show the quality of the forecast decreases with increasing lead time; this may justify a constraint on the models to keep the good quality of the long‐term seasonal forecast in CA.