Volume 26, Issue 1, August 2016, Pages 236–254
Albert Mbata Muliwavyo1, Jean Marie Tshitenge Mbuebue2, Edmond Phuku Phuati3, François Tondozi Keto4, Richard Bopili Mbotia5, and Ndotoni Zana6
1 Department of Physics, University of Kinshasa, B.P. 190 Kinshasa XI, RD Congo
2 Department of Physics, Faculty of Sciences, University of Kinshasa, RD Congo
3 Department of Physics, University of Kinshasa, B.P. 190 Kinshasa XI, RD Congo
4 Department of Physics, Faculty of Sciences, University of Kinshasa, RD Congo
5 Department of Physics, Faculty of Sciences, University of Kinshasa, RD Congo
6 Department of Physics, Faculty of Sciences, University of Kinshasa, RD Congo
Original language: English
Copyright © 2016 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
The singular spectral analysis, the multitaper method and the wavelet analysis were applied to the standardized average series of the temperatures in the oriental mountainous zone in the Democratic Republic of the Congo in order to determine the periods of temperature fluctuations at interannual and decennial timescales in that region. These different spectral methods reveal in the temperatures of this region a signal of four years period close. The spectral analysis by wavelet coherence was also applied to the couple made of temperature series and each principal characteristic indice of Atlantic, Indian and Pacific basins in order to assess the influence of these basins on temperatures over that region . This analysis shows that the phenomenon El Ninõ Southern Oscillation phenomenon and the Western Hemisphere Warm Pool are the principal drivers of the temperature fluctuations in this area on the interannual scale of 2-8 years, the coherence’s peak between the temperatures and these phenomena is located at approximately four years. The anomalies of sea surface temperatures of the tropical Atlantic Ocean also contribute to the fluctuations of the temperatures in this area on a scale 2-4 years by the means of the Atlantic Multidecennial Oscillation, the variability of the Tropical Northern Atlantic and the Atlantic Meridional Mode. The contributions of the oscillation of the North Atlantic, the variability of the Tropical Southern Atlantic and the Dipolar Mode of the Indian Ocean to the fluctuations, on interannual and decennial timescales, of the temperatures on this mountainous region are not significant.
Author Keywords: coherence, fluctuations, singular spectral analysis, multitaper method, wavelet analysis.
Albert Mbata Muliwavyo1, Jean Marie Tshitenge Mbuebue2, Edmond Phuku Phuati3, François Tondozi Keto4, Richard Bopili Mbotia5, and Ndotoni Zana6
1 Department of Physics, University of Kinshasa, B.P. 190 Kinshasa XI, RD Congo
2 Department of Physics, Faculty of Sciences, University of Kinshasa, RD Congo
3 Department of Physics, University of Kinshasa, B.P. 190 Kinshasa XI, RD Congo
4 Department of Physics, Faculty of Sciences, University of Kinshasa, RD Congo
5 Department of Physics, Faculty of Sciences, University of Kinshasa, RD Congo
6 Department of Physics, Faculty of Sciences, University of Kinshasa, RD Congo
Original language: English
Copyright © 2016 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
The singular spectral analysis, the multitaper method and the wavelet analysis were applied to the standardized average series of the temperatures in the oriental mountainous zone in the Democratic Republic of the Congo in order to determine the periods of temperature fluctuations at interannual and decennial timescales in that region. These different spectral methods reveal in the temperatures of this region a signal of four years period close. The spectral analysis by wavelet coherence was also applied to the couple made of temperature series and each principal characteristic indice of Atlantic, Indian and Pacific basins in order to assess the influence of these basins on temperatures over that region . This analysis shows that the phenomenon El Ninõ Southern Oscillation phenomenon and the Western Hemisphere Warm Pool are the principal drivers of the temperature fluctuations in this area on the interannual scale of 2-8 years, the coherence’s peak between the temperatures and these phenomena is located at approximately four years. The anomalies of sea surface temperatures of the tropical Atlantic Ocean also contribute to the fluctuations of the temperatures in this area on a scale 2-4 years by the means of the Atlantic Multidecennial Oscillation, the variability of the Tropical Northern Atlantic and the Atlantic Meridional Mode. The contributions of the oscillation of the North Atlantic, the variability of the Tropical Southern Atlantic and the Dipolar Mode of the Indian Ocean to the fluctuations, on interannual and decennial timescales, of the temperatures on this mountainous region are not significant.
Author Keywords: coherence, fluctuations, singular spectral analysis, multitaper method, wavelet analysis.
How to Cite this Article
Albert Mbata Muliwavyo, Jean Marie Tshitenge Mbuebue, Edmond Phuku Phuati, François Tondozi Keto, Richard Bopili Mbotia, and Ndotoni Zana, “Temperature fluctuations at interannual and decennial timescales on the eastern mountainous region in Democratic Republic of the Congo from period of 1940 to 1997,” International Journal of Innovation and Scientific Research, vol. 26, no. 1, pp. 236–254, August 2016.
