Geography

Climate and Storms

A low pressure region is developed in the Atlantic and high pressure region in Peru in a normal year and therefore trade winds flow strongly from the east to west in the pacific and therefore warm waters are carried westward, in el Nio years the low pressure region is replaced by a relatively high pressure region in the pacific and this reduces the strength of trade winds and therefore there is an accumulation of warm water in Peru, in la Nina periods results after the el Nino period whereby there is an accumulation of cold water in the pacific.

References:
Columbia (2009) ENSO, retrieved on 29th November, from http://iri.columbia.edu/climate/ENSO/globalimpact/TC/Atlantic/index.html
CCD (2009) la Nina report, retrieved on 29th November, from Http://www.ccd.ucar.edu/lanina/report/baethgen.html
CPC (2009) List of El Nio and la Nina years, retrieved on 29th November, from http://www.cpc.noaa.gov/products/analysis_monitoring/ensostuff/ensoyears.shtml
Physical geography (2009) ocean circulation differences in El Nio and la Nina years, retrieved on 29th November, from http://www.physicalgeography.net/fundamentals/7z.html
Wunder Ground (2009) 1997 hurricanes, retrieved on 29th November, from http://www.wunderground.com/hurricane/at1997.asp
Wunder Ground (2009) 1995 hurricanes, retrieved on 29th November, from

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