RELEVANCE – UPSC GS PRELIMS & GS MAINS-I
First go through the text (given after the questions) and then attempt the questions
UPSC PRELIMS 2015
QUES . In the South Atlantic and South Eastern Pacific regions in tropical latitudes, cyclone does not originate. What is the reason?
(a) Sea Surface temperature are low
(b) Inter Tropical Convergence Zone seldom occurs
(c) Coriolis force is too weak
(d) Absence of land in those regions
ANSWER. (a) Sea Surface temperature are low
Reasons for non formation of tropical cyclones in the South Atlantic
Tropical cyclones in the South Atlantic are extremely rare . Reasons behind non formation of tropical cyclones in the South Atlantic are:
1 . Very strong vertical wind shear in the troposphere is considered a deterrent.
2 . The Intertropical Convergence Zone drops one to two degrees south of the equator, not far enough from the equator for the Coriolis force to significantly aid development.
3 . Water temperatures in the tropics of the southern Atlantic are cooler than those in the tropical north Atlantic.
Thus, strong wind shear as well as a lack of weather disturbances favorable for development of cyclones in the South Atlantic Ocean, make any strong tropical system extremely rare, and Hurricane Catarina in 2004 is the only recorded South Atlantic hurricane in history.