Analisis Dinamika Atmosfer dan Lautan Terhadap Pola Cuaca dan Iklim di Sumatera Utara

Abstract

Based on topographic conditions in North Sumatra in the top five areas include: East Coast, East Slope, Mountains, West Slope and West Coast. The data used are monthly rainfall data of 12 rain posts in North Sumatra, ENSO Index and Dipole Mode Index data period 1980-2009. Generally, rainfall in North Sumatra is Equatorial type with peak of rain occurs in April-May and September-November. Monthly average rainfall in North Sumatra ranges from 150-250 mm, the highest rainfall occurs in the West Slope with rainfall ranged from 350-400 mm, while the lowest rainfall occurred on the East Coast with rainfall ranged from 100-150 mm. Spectral analysis of wavelet monthly rainfall in North Sumatra region generally shows the influence of annual oscillation. El Nino and Dipole Mode Positive conditions affect the annual rainfall reduction to 9%, while the condition (?l La Nina affect the addition of annual rainfall up to 8%.