A Harmonic Analysis in Seasonal Oscillation of Surface Air Temperature over Assam
Journal Title: International Journal of Engineering and Science Invention - Year 2017, Vol 6, Issue 9
Abstract
The present study is done with the data series of surface air temperature for the period of (1969- 2013) for 45 years. The result of the study shows the climatic classification or the seasonal variation pattern of the five different studied locations over Assam. The harmonic analysis shows the variation pattern of seasonal oscillation, that there observed different three types of variation pattern and different four types of range of variation pattern. Thus it is clear that seasonal oscillation is responsible for climatic classification of a location. The seasonal oscillation depends on the amplitude of the harmonics of studied location, in the present study amplitude varies from location to location significantly, the range of amplitude of first harmonic (annual oscillation) lies between in (6.47⁰c and -4.89⁰c) where Dibrugarh shows the both maximum and minimum amplitude; Dhubri, Guwahati, Silchar and Tezpur show the range of (5.52⁰c to -3.23⁰c), (6.1⁰c to -3.55⁰c), (5.46⁰c to -3.72⁰c) and (5.71⁰c to -4.23⁰c) respectively. While second and third harmonic shows the range (1.87⁰c to -1.44⁰c) and (0.60⁰c to -1.13⁰c) respectively where tertiary oscillation or third harmonic shows considerably low amplitude so annual and semi-annual oscillation are most significantly suitable than tertiary oscillation to study seasonal variation of surface air temperature.
Authors and Affiliations
Mr. Partha Nath Dutta, Dr. Tado Karlo, Mr. Mohon Daimary, Dr. Pallabi Dutta
Keywords
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