A Celebration of Elephants

David Shepherd


david shepherd, signed limited edition print, A Celebration of Elephants
A Celebration of Elephants
Limited Edition of 400
Exclusively for David Shepherd's 70th birthday
Date of publication 25th April, 2001
Image Size:- 46 x 21cm.

Clouds of dust that arose in Africa are wafting over parts of the Americas, tinting skies brown, creating shimmering sunsets, and suppressing hurricanes in the Atlantic Ocean.
And more dust is on its way.

Perhaps the most impressive of cloud formations, cumulonimbus (from the Latin for 'pile' and 'rain cloud') clouds form due to vigorous convection (rising and overturning) of warm, moist and unstable air.
Surface air is warmed by the sun-heated ground surface and rises; if sufficient atmospheric moisture is present, water droplets will condense as the air mass encounters cooler air at higher altitudes.
The air mass itself also expands and cools as it rises due to decreasing atmospheric pressure, a process known as adiabatic cooling.
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