Seasonal Climate Predictability over Kenya Using the Regional Spectral Model

https://doi.org/10.20987/jmrs.2.01.2017

Franklin J. Opijah*, Joseph N. Mutemi and Laban A. Ogallo

University of Nairobi, Department of Meteorology

 

Corresponding Author

Franklin J. Opijah

University of Nairobi, Department of Meteorology

This email address is being protected from spambots. You need JavaScript enabled to view it.; This email address is being protected from spambots. You need JavaScript enabled to view it.

 

Abstract

Seasonal climate prediction over Kenya poses a considerable challenge to the modeling community due to the intricate interactions among the atmospheric, oceanic and land surface processes. This paper assesses the performance of the Regional Spectral Model (RSM) in downscaling the European Centre-Hamburg (ECHam) global model outputs from 1970 to 1999 over Kenya with respect to rainfall and temperature prediction using standard verification techniques. The results show that the accuracy of simulating the annual cycle and spatial distribution of convection and precipitation over the country is still poor. The seasonal rainfall predictability over Kenya by the RSM is better during the October-December season (correlation coefficient [r] of 26%; proportion correct [PC] of 60%; Frequency Bias Index [FBI] of 111%) than in the March-May season (r of 8%; PC of 54%; FBI of 83%), but the prediction for temperature is better in the March-May season (r of 25%; PC of 53%; FBI of 124%) than the OND season (r of -11%; PC of 46%; FBI of 100%). The predictability for rainfall during the cool-dry June-August period is still low (r of -4%; PC of 49%; FBI of 52%) but that for temperature has better skill as compared to the March-May and October-December seasons (r of 49%; PC of 70%; FBI of 90%). There is need to improve the development of convective processes that govern tropical precipitating systems in the region through sensitivity analysis of cloud simulation modules in the RSM applied as well as address rare systems that episodically influence the weather over the country and the region.

Key words: skill score, root mean square error, correlation, RSM, ECHam, seasonal prediction, rainfall, temperature, Kenya

Full text:

Download full text (pdf)

Get In Touch

KENYA METEOROLOGICAL SOCIETY (KMS)
Physical Address: Kenya Meteorological Department (KMD) Dagoretti Corner along Ngong Road, next to the Institute for Meteorological Training and Research (IMTR) library.
Postal Address: P. O. BOX 41959 - 00100
Nairobi, Kenya

Phone: +254 20 214 7770
Phone: +254 20 386 7880
Fax:       +254 20 387 6955
Email:  info@kms.or.ke

Top