Seasonal Rainfall Variability over Southern Ghana

• DOI: 10.20944/preprints202108.0150.v1
• Publication Date: 2021-08-06T08:34:34Z
• Authors: Mohammed Braimah; Vincent Antwi Asante; Maureen Ahiataku; Samuel Owusu Ansah; Frederick Otu-Larbi; Bashiru Yahaya; John Bright Ayabila
• Keywords: Wet season; Dry season; Anomaly (physics)

Rainfall variability has resulted in extreme events like devastating floods and droughts which is the main cause of human vulnerability to precipitation West Africa. Attempts have been made by previous studies understand rainfall over Ghana but these mostly focused on major rainy season April-July, leaving a gap our understanding September-November very important aspect Ghanaian climate system. The current study seeks close this knowledge employing statistical tools quantify variabilities amounts, rain days, indices minor Ghana. We find extremely high with Coefficient variation (CV) between 25.3% 70.8%, moderate days (CV=14.0% - 48.8%). amount was found be higher middle sector (262.7 mm – 400.2 mm) lowest east coast (125.2 181.8 mm). Analysis second using Mankandell Test presents non-significant trend (R10, R20, R99p, R99p) for many places southern Anomaly Indices show that recorded above normal opposite areas transition zone. result work provides good may used planning purposes.