CONDITIONS in India are road-meltingly hot: on May 19th residents of Phalodi, a city in the north of the country, had to cope with temperatures of 51°C—the highest since records there began. Records are tumbling elsewhere, too. According to the latest data from America’s National Oceanic and Atmospheric Administration, 13 of the 15 highest monthly temperature anomalies have occurred since February 2015. The average temperature over land and ocean surfaces in April was 1.10°C above last century’s average (see map). The current year will almost certainly be the warmest on record, and probably by the largest margin to date.
A Pacific-wide climatic phenomenon known as El Niño (“The Boy” in Spanish) helps explain the heat. In non-Niño years, trade winds blow warm water to the west, where it pools in the western tropical Pacific. Cooler water is drawn up from the depths to the surface in the Pacific’s east as a result, in a process known as upwelling. Every two to seven years, the pool of warm water sloshes back eastwards when the trade winds weaken or even reverse; this is El Niño in action. The interaction of the Pacific Ocean and...Continue reading
Source: Science and technology http://ift.tt/1TLAxal
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