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Singular spectrum analysis, harmonic regression and El-Nino effect on total ozone (1979–1993) over India and surrounding regions

  • Chandramadhab Pal
Article
  • 47 Downloads

Abstract

The Total Ozone Mapping Spectrometer (TOMS) is a satellite instrument that records Total Column Ozone (TCO) concentration (in DB) of the atmosphere in the form of different overpass files. We have selected 23 sites over India (15), Pakistan (4), Bangladesh (1) and adjoining China (3) to investigate the TCO scenario over this region. About 114,000 historical records (1979M1–1992M12) from 23 overpass files were processed to generate 23 monthly mean time series (TS) of TCO. Statistical analysis followed by singular spectrum analysis (SSA), harmonic regression (HR) and spatial interpolation have been used to accomplish the investigation. Four dominant signals; quasi-biennial signal (QBI, \(\hbox {T} = 30.12\) months), quasi-annual signal (QAN, \(\hbox {T} = 19.69\) months), annual signal (ANN, \(\hbox {T} = 12\) months) and semi-annual signal (SAN, \(\hbox {T} = 6\) months) were discerned to explain the variability. Direct latitudinal effect on the TCO distribution was observed. The variance was limited between 80.53 and 90.13%; ANN contributes 65.93–93.22% followed by SAN 0.58–5.69%, QAN 0.33–5.48%, and QBI 0.06–5.94%. Peak values of the oscillations are estimated from phasor diagrams: QBI, March to May in the mid-latitude; QAN, April, and May; ANN, February to April; SAN, March to May. Incisive pictures of the average distribution and variability of four sinusoids were investigated from contour plots. Two ozone valley were discerned from Spatial interpolation; one over Deccan Plateau in low and other over Tibetan Plateau in high latitude. 179 outliers from \(23 \times 168\) observations have been identified after harmonic regression. The appearance of the outliers is highly consistent with extreme phases of multivariate ENSO Index and Dipole Mode Index.

Keywords

Total ozone singular spectrum analysis spatial interpolation multivariate ENSO Index Dipole Mode Index 

Notes

Acknowledgements

The author is grateful to ‘Ozone Processing Team (OPT) of NASA/Goddard Space Flight Center’ for the historical records of ozone data. He wishes to thank his son Mr. Subhradeep Pal, Ph.D. scholar in IIT Patna, India and Br. Subrata, Department of Statistics, Ramakrishna Mission Vidyamandira, Belurmath, Howrah, India for their active support and valuable discussion.

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Copyright information

© Indian Academy of Sciences 2018

Authors and Affiliations

  1. 1.Department of PhysicsRamakrishna Mission VidyamandiraBelurmath, HowrahIndia

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