Cavalier India Defence Training Academy

Important Geophysical phenomena such as earthquakes, Tsunami, Volcanic activity, cyclone etc. CONTEXT As per latest findings, nearly six out of 10 droughts , in non-El Nino years , that occurred during the Indian summer-monsoon season in the past century may have been driven by atmospheric disturbances from the North Atlantic region. In 2014, India saw a 14% rainfall deficit — or a drought — that wasn’t linked to El Nino and before that in 1986 and 1985. Factors that influence these droughts These droughts are a consequence of a sudden and steep drop in rainfall in late August. Winds in the upper atmosphere are interacting with a deep cyclonic circulation above the abnormally cold North Atlantic waters. The resulting wave of air currents, called a Rossby wave, curved down from the North Atlantic squeezed in by the Tibetan plateau and hit the subcontinent around mid-August, suppressing rainfall and throwing off the monsoon that was trying to recover from the June slump. What is El Nino?...