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The effect of Indian Ocean on Ethiopian seasonal rainfall

  • Getachew DubacheEmail author
  • Bob Alex Ogwang
  • Victor Ongoma
  • Abu Reza Md. Towfiqul Islam
Original Paper
  • 38 Downloads

Abstract

Singular value decomposition method is used to investigate the covariability between Ethiopian main rainy season [Kiremt, June to September (JJAS)] anomalies and the anomalous sea surface temperature (SST) in Indian Ocean based on precipitation and SST reanalysis datasets. Results show that significant coupled modes of variability exist, with the first dominant coupled mode explaining 49.3% and the second dominant coupled mode explains 12.6% of the total covariance. There is, however, higher correlation between the second dominant coupled modes than the first one. The spatial pattern of the first dominant mode shows a strong positive loading of SST in the central part of Indian Ocean, and below (above) normal rainfall in western (eastern) part of Ethiopia. The second dominant mode exhibits positive phase of Indian Ocean Dipole (IOD) event, with a strong positive (negative) SST anomaly in the western (southeastern) sector of Indian Ocean. This is associated with below (above) normal rainfall in northwestern (southeastern) region of Ethiopia. This is further affirmed by the correlation between the Dipole Mode Index of IOD and Ethiopian JJAS rainfall, which shows a negative (positive) correlation in the northwestern (southeastern) region. The analysis of the circulation anomalies associated with the pure positive (negative) IOD years are associated with anomalous easterly (westerly) winds over Ethiopia. Further analysis reveals that there is a widespread moisture divergence over Ethiopia and neighboring countries during negative phase of IOD as opposed to the positive phase of IOD which exhibits moisture convergence over the entire south and eastern Ethiopia, including parts of Uganda, Kenya, South Sudan, and western Somalia. The findings from this study give insight into the influence of Indian Ocean on Ethiopian JJAS rainfall.

Notes

Acknowledgements

The authors thank NOAA for their reanalysis datasets used this study, ECMWF for providing the ERA-Interim reanalysis data. Special appreciation goes to Chinese Scholarship Council (CSC) for the financial support, and Nanjing University of Information Science and Technology (NUIST) for providing the required facilities for data analysis and for all other forms of support. The authors are indebted to the two anonymous reviewers for their helpful insights that helped to improve the quality of this work.

References

  1. Asfaw A, Simane B, Hassen A, Bantider A (2018) Variability and time series trend analysis of rainfall and temperature in northcentral Ethiopia: a case study in Woleka sub-basin. Weather Clim Extrem 19:29–41.  https://doi.org/10.1016/j.wace.2017.12.002 CrossRefGoogle Scholar
  2. Baker K (2005) Singular value decomposition tutorial. The Ohio State University, OhioGoogle Scholar
  3. Bekele F (1997) Ethiopian use of ENSO information in its seasonal forecasts. Int J Afr Stud No. 2—March 1997. https://www.bradford.ac.uk/research-old/ijas/ijasno2/bekele.html. Accessed 3 Sep 2018
  4. Berhan G, Hill S, Tadesse T, Atnafu S (2011) Using satellite images for drought monitoring: a knowledge discovery approach. J Stra Inno Sustain 7:135–153Google Scholar
  5. Bewket W (2009) Rainfall variability and crop production in Ethiopia: Case study in the Amhara region. In: Ege S, Aspen H, Teferra B, Bekele S (eds) Proceedings of the 16th international conference of Ethiopian Studies. Trondheim, 2009Google Scholar
  6. Bjornsson H, Venegas S (1997) A manual for EOF and SVD analyses of climatic data. CCGCR Rep 97(1):112–134Google Scholar
  7. Bretherton CS, Smith C, Wallace JM (1992) An intercomparison of methods for finding coupled patterns in climate data. J Clim 5:541–560CrossRefGoogle Scholar
  8. Camberlin P (1995) June–september rainfall in northeastern Africa and atmospheric signals over the tropics: a zonal perspective. Int J Climatol 15:773–783CrossRefGoogle Scholar
  9. Camberlin P, Okoola R (2003) The onset and cessation of the “long rains” in eastern Africa and their interannual variability. Theor Appl Climatol 75:43–54.  https://doi.org/10.1007/s00704-002-0721-5 Google Scholar
  10. Cheung HW, Senayb BG, Singha A (2008) Trends and spatial distribution of annual and seasonal rainfall in Ethiopia. Int J Climatol 28:1723–1734.  https://doi.org/10.1002/joc.1623 CrossRefGoogle Scholar
  11. Conway D, Lisa E, Schipper F (2011) Adaptation to climate change in Africa: challenges and opportunities identified from Ethiopia. Global Environ Change 21:227–237.  https://doi.org/10.1016/j.gloenvcha.2010.07.013 CrossRefGoogle Scholar
  12. Dee DP, Uppala SM, Simmons AJ, Berrisford P, Poli P, Kobayashi S, Andrae U, Balmaseda MA, Balsamo G, Bauer P, Bechtold P, Beljaars ACM, van de Berg L, Bidlot J, Bormann N, Delsol C, Dragani R, Fuentes M, Geer AJ, Haimberger L, Healy SB, Hersbach H, Hólm EV, Isaksen L, Kållberg P, Köhler M, Matricardi M, McNally AP, Monge-Sanz BM, Morcrette J-J, Park B-K, Peubey C, de Rosnay P, Tavolato C, Thépaut J-N, Vitart F (2011) The ERA-Interim reanalysis: configuration and performance of the data assimilation system. Q J R Meteorol Soc 137:553–597.  https://doi.org/10.1002/qj.828 CrossRefGoogle Scholar
  13. Degefu W (1987) Some aspects of meteorological drought in Ethiopia. Cambridge University Press, CambridgeGoogle Scholar
  14. Degefu MA, Rowell DP, Bewket W (2017) Teleconnections between Ethiopian rainfall variability and global SSTs: observations and methods for model evaluation. Meteorol Atmos Phys 129:173–186.  https://doi.org/10.1007/s00703-016-0466-9 CrossRefGoogle Scholar
  15. Devereux S (2000) Food security in Ethiopia: a discussion paper for Department of International Development. Institute of Development Studies, SussexGoogle Scholar
  16. Diro GT, Black E, Grimes DIF (2008) Seasonal forecasting of Ethiopian spring rains. Meteorol Appl 15:73–83.  https://doi.org/10.1002/met.63 CrossRefGoogle Scholar
  17. Diro GT, Grimes DIF, Black E (2011a) Large scale features affecting Ethiopian rainfall. In: Kniveton DR (ed) Williams CJR. Springer, Dordrecht, pp 13–50Google Scholar
  18. Diro GT, Grimes DIF, Black E (2011b) Teleconnections between Ethiopian summer rainfall and sea surface temperature: part I—observation and modelling. Clim Dyn 37:103–119.  https://doi.org/10.1007/s00382-010-0837-8 CrossRefGoogle Scholar
  19. EPCC (Ethiopian Panel on Climate Change) (2015) First Assessment Report, Working Group II Agriculture and Food Security. Ethiopian Academy of Sciences, Addis AbabaGoogle Scholar
  20. Esayas B, Simane B, Teferi E, Tefera N, Ongoma V, Tefera N (2018) Trends in extreme climate events over three agro-ecological zones over Southern Ethiopia. Adv Meteorol.  https://doi.org/10.1155/2018/7354157 Google Scholar
  21. Ferris-Morris M (2003) Planning for the next drought: Ethiopia case study. USAID, WashingtonGoogle Scholar
  22. Folland CK (1983) Regional-scale interannual variability of climate. A north-west European perspective. Meteorol Mag 12:163–187Google Scholar
  23. Fraser EDG (2007) Travelling in antique lands: using past famines to develop an adaptability/resilience framework to identify food systems vulnerable to climate change. Clim Change 83:495–514.  https://doi.org/10.1007/s10584-007-9240-9 CrossRefGoogle Scholar
  24. Furman T, Merritt E (2000) A data-intensive approach to studying climate and climate change in Africa. J Geosci Educ 48:464–468.  https://doi.org/10.5408/1089-9995-48.4.464 CrossRefGoogle Scholar
  25. Gebrehiwot T, Van der Veen A (2013) Assessing the evidence of climate variability in the northern part of Ethiopia. J Dev Agric Econ 5:104–119CrossRefGoogle Scholar
  26. Giannini A, Saravana R, Chang P (2003) Oceanic forcing of Sahel rainfall on inter-annual to inter-decadal time scales. Science 302:1027–1030.  https://doi.org/10.1126/science.1089357 CrossRefGoogle Scholar
  27. Gissila T, Black E, Grimes DIF, Slingo JM (2004) Seasonal forecasting of the Ethiopian summer rains. Int J Climatol 24:1345–1358.  https://doi.org/10.1002/joc.1078 CrossRefGoogle Scholar
  28. Gleixner S, Keenlyside N, Viste E, Korecha D (2017a) The El Niño effect on Ethiopian summer rainfall. Clim Dyn 49:1865–1883.  https://doi.org/10.1007/s00382-016-3421-z CrossRefGoogle Scholar
  29. Gleixner S, Keenlyside NS, Demissie TD, Counillon F, Wang Y, Viste E (2017b) Seasonal predictability of Kiremt rainfall in coupled general circulation models. Environ Res Lett 12:114016.  https://doi.org/10.1088/1748-9326/aa8cfa CrossRefGoogle Scholar
  30. Hannachi A, Jolliffe IT, Stephenson DB (2007) Empirical orthogonal functions and related techniques in atmospheric science: a review. Int J Climatol 27:1119–1152.  https://doi.org/10.1002/joc.1499 CrossRefGoogle Scholar
  31. Hastenrath S (1991) Climate dynamics of the tropics. Kluwer Academic Publishers, Alphen aan den Rijn, p 488CrossRefGoogle Scholar
  32. Ininda JM (1994) Numerical simulation of the influence of sea surface temperature anomalies on the East African seasonal rainfall. PhD. Thesis, University of Nairobi, KenyaGoogle Scholar
  33. IPCC (2007) Climate change 2007: the physical science basis. Contribution of Working Group I to the fourth assessment report of the intergovernmental panel on climate change. Cambridge University Press, CambridgeGoogle Scholar
  34. Juneng L, Tangang FT (2006) The covariability between anomalous northeast monsoon rainfall in Malaysia and sea surface temperature in Indian-Pacific sector: a singular value decomposition analysis approach. J Phys Sci 17:101–115Google Scholar
  35. Jury MR (2010) Ethiopian decadal climate variability. Theor Appl Climatol 101:29–40.  https://doi.org/10.1007/s00704-009-0200-3 CrossRefGoogle Scholar
  36. Kassahun B (1987) Weather systems over Ethiopia. In: Proceedings of First Tech. Conf. on Meteorological Research in Eastern and Southern Africa. Nairobi, Kenya, pp 53–57Google Scholar
  37. Korecha D, Barnston AG (2007) Predictability of June–September rainfall in Ethiopia. Mon Wea Rev 135:628–650.  https://doi.org/10.1175/mwr3304.1 CrossRefGoogle Scholar
  38. Lamb HH (1977) Some comments on the drought in recent years in the Sahel–Ethiopia zone of North Africa. Drought in Africa. Dalby D, Harrison-Churh RJ, Bazzaz F (eds) School of Oriental and African Studies 2:33–37. https://scholar.google.com/scholar_lookup?title=Some%20comments%20on%20the%20drought%20in%20recent%20years%20in%20the%20Sahel-Ethiopian%20zone%20of%20North%20Africa&author=H.%20H..%20Lamb&pages=33-37&publication_year=1977
  39. Ngarukiyimana JP, Fu Y, Yang Y-J, Ogwang BA, Ongoma V, Ntwali D (2017) Dominant atmospheric circulation patterns associated with abnormal Rainfall events over Rwanda, East Africa: Atmospheric Circulation Patterns of Abnormal Rainfall Events. Int J Climatol 38:187–202.  https://doi.org/10.1002/joc.5169 CrossRefGoogle Scholar
  40. Nicholson SE (1989) Long-term changes in African rainfall. Weather 44:46–56CrossRefGoogle Scholar
  41. Ogwang BA, Chen H, Tan G, Ongoma V, Ntwali D (2015a) Diagnosis of East African climate and the circulation mechanisms associated with extreme wet and dry events: a study based on RegCM4. Arab J Geosci 8:10255–10265.  https://doi.org/10.1007/s12517-015-1949-6 CrossRefGoogle Scholar
  42. Ogwang BA, Ongoma V, Li X, Ogou FK (2015b) Influence of mascarene high and Indian Ocean Dipole on East African extreme weather events. Geographica Pannonica 19:64–72CrossRefGoogle Scholar
  43. Ogwang BA, Chen H, Li X, Gao C (2016) Evaluation of the capability of RegCM4.0 in simulating East African climate. Theor Appl Climatol 124:303–313.  https://doi.org/10.1007/s00704-015-1420-3 CrossRefGoogle Scholar
  44. Okoola RE (1999) Mid-tropospheric circulation patterns associated with extreme dry and wet episodes over equatorial eastern Africa during the northern hemisphere spring. J Appl Meteorol 38:1161–1169.  https://doi.org/10.1175/1520-0450(1999)038%3c1161:MCPAWE%3e2.0.CO;2 CrossRefGoogle Scholar
  45. Omondi P, Awange JL, Ogallo LA, Ininda J, Forootan E (2013) The influence of low frequency sea surface temperature modes on delineated decadal rainfall zones in Eastern Africa region. Adv Water Res 54:161–180.  https://doi.org/10.1016/j.advwatres.2013.01.001 CrossRefGoogle Scholar
  46. Ongoma V, Chen H, Gao C, Nyongesa AM, Polong F (2018) Future changes in climate extreme over Equatorial East Africa based on CMIP5 multimodel ensemble. Nat Hazards 90:901–920.  https://doi.org/10.1007/s11069-017-3079-9 CrossRefGoogle Scholar
  47. Osman YZ, Shamseldin YA (2002) Quantitative rainfall prediction models for Central and Southern Sudan using El-Niño–Southern Oscillation and Indian Ocean sea surface temperature indices. Int J Climatol 22:1861–1878CrossRefGoogle Scholar
  48. Saji NH, Yamagata T (2003) Possible impacts of Indian Ocean Dipole Mode events in global climate. Clim Res 25:151–169CrossRefGoogle Scholar
  49. Saji NH, Goswami BN, Vinayachandran PN, Yamagata T (1999) A dipole mode in the tropical Indian Ocean. Nature 401:360–363Google Scholar
  50. Sarah TL (2002) Climate change and poverty. Tearfund, TeddingtonGoogle Scholar
  51. Schneider U, Becker A, Finger P, Meyer-Christoffer A, Ziese M, Rudolf B (2013) GPCC’s new land surface precipitation climatology based on quality-controlled in situ data and its role in quantifying the global water cycle. Theor Appl Climatol 115:15–40.  https://doi.org/10.1007/s00704-013-0860-x CrossRefGoogle Scholar
  52. Schreck CJ III, Semazzi FHM (2004) Variability of the recent climate of Eastern Africa. Int J Climatol 24:681–701.  https://doi.org/10.1002/joc.1019 CrossRefGoogle Scholar
  53. Segele ZT, Lamb PJ (2005) Characterization and variability of Kiremt rainy season over Ethiopia. Meteorol Atmos Phys 89:153–180.  https://doi.org/10.1007/s00703-005-0127-x CrossRefGoogle Scholar
  54. Segele ZT, Lamb PJ, Leslie LM (2009a) Large-scale atmospheric circulation and global sea surface temperature associations with Horn of Africa June–September rainfall. Int J Climatol 29:1075–1100.  https://doi.org/10.1002/joc.1751 CrossRefGoogle Scholar
  55. Segele ZT, Lamb PJ, Leslie ML (2009b) Seasonal-to-interannual variability of Ethiopia/Horn of Africa monsoon. Part I: associations of wavelet-filtered large-scale atmospheric circulation and global sea surface temperature. J Climate 22:3396–3421.  https://doi.org/10.1175/2008JCLI2859.1 CrossRefGoogle Scholar
  56. Segele ZT, Leslie LM, Tarhule AA (2015) Sensitivity of horn of Africa rainfall to regional sea surface temperature forcing. Climate 3:365–390.  https://doi.org/10.3390/cli3020365 CrossRefGoogle Scholar
  57. Shanko D, Camberlin P (1998) The effect of the southwest Indian Ocean tropical cyclones on Ethiopian drought. Int J Climatol 18:1373–1378.  https://doi.org/10.1002/(SICI)1097-0088(1998100)18:12%3c1373:AID-JOC313%3e3.0.CO;2-K CrossRefGoogle Scholar
  58. Slingo JM, Spencer H, Hoskins BJ, Berrisford P, Black E (2005) The meteorology of the western Indian Ocean and the influence of the East African Highlands. Philos Trans R Soc A 363:25–42.  https://doi.org/10.1098/rsta.2004.1473 CrossRefGoogle Scholar
  59. Smith RB (1979a) The influence of mountains on the atmosphere. Adv Geophys 21:87–233.  https://doi.org/10.1016/S0065-2687(08)60262-9 CrossRefGoogle Scholar
  60. Smith RB (1979b) The influence of mountains on the atmosphere. Adv Geophys 21:87–233.  https://doi.org/10.1016/S0065-2687(08)60262-9 CrossRefGoogle Scholar
  61. Smith TM, Reynolds RW, Peterson TC, Lawrimore J (2008) Improvements to NOAA’s historical merged land–ocean surface temperature analysis (1880–2006). J Climate 21:2283–2296.  https://doi.org/10.1175/2007JCLI2100.1 CrossRefGoogle Scholar
  62. Tan G-R, Li H, Ren HL, Chen H (2014) Quantifying synoptic eddy feedback onto the low-frequency flow associated with anomalous temperature events in January over China. Int J Climatol 35:1976–1983.  https://doi.org/10.1002/joc.4135 CrossRefGoogle Scholar
  63. Tebaldi C, Hayhoe K, Arblaster JM, Meehl GA (2006) Going to extremes. An inter-comparison of model-simulated historical and future changes in extreme events. Clim Change 79:185–211.  https://doi.org/10.1007/s10584-006-9051-4 CrossRefGoogle Scholar
  64. Tsegay W (2001) The case of Ethiopia: impacts and responses to the 1997–98 El Niño event. In: Glantz MH (ed) Once burned, twice shy? Lessons learned from the 1997–98 El Niño. United Nations University Press, Tokyo, pp 88–100Google Scholar
  65. Viste E, Sorteberg A (2013) The effect of moisture transport variability on Ethiopian summer precipitation. Int J Climatol 33:3106–3123.  https://doi.org/10.1002/joc.3566 CrossRefGoogle Scholar
  66. Wallace JM, Smith C, Bretherton CS (1992) Singular value decomposition of wintertime sea surface temperature and 500-mb height anomalies. J Clim 5:561–576CrossRefGoogle Scholar
  67. Williams AP, Funk C, Michaelsen J, Rauscher SA, Robertson I, Wils TGH, Koprowski M, Eshetu Z, Loader NJ (2012) Recent summer precipitation trends in the Greater Horn of Africa and the emerging role of Indian Ocean Sea surface temperature. Clim Dyn 39:2307–2328.  https://doi.org/10.1007/s00382-011-1222-y CrossRefGoogle Scholar
  68. Wolde-Georgis T (1997) El Niño and drought early warning in Ethiopia. Using science against famine: food security, famine early warning and El Niño, Internet J. Afr. Stud. Issue No. 2-April 1997, Michael H. Glantz, special Volume eds. http://www.brad.ac.uk/research/ijas/ijasno2/ijasno2.html. Accessed 10 Oct 2014
  69. Zeleke T, Giorgi F, Tsidu MG, Diro GT (2013) Spatial and temporal variability of summer rainfall over Ethiopia from observations and a regional climate model experiment. Theor Appl Climatol 111:665–681.  https://doi.org/10.1007/s00704-012-0700-4 CrossRefGoogle Scholar
  70. Zhi X-F (2001) Interannual variability of the Indian summer monsoon and its modeling with zonally symmetric 2D-Model. Shaker Verlag, Aachen, p 151Google Scholar

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© Springer-Verlag GmbH Austria, part of Springer Nature 2019

Authors and Affiliations

  1. 1.State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina
  2. 2.College of Earth and Planetary ScienceUniversity of Chinese Academy of SciencesBeijingChina
  3. 3.School of Atmospheric SciencesNanjing University of Information Science and TechnologyNanjingChina
  4. 4.Uganda National Meteorological AuthorityKampalaUganda
  5. 5.African Centre of Meteorological Applications for Development (ACMAD)NiameyNiger
  6. 6.School of Geography, Earth Science and EnvironmentThe University of the South PacificSuvaFiji
  7. 7.Department of Disaster ManagementBegum Rokeya UniversityRangpurBangladesh

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