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Role of the Indian Ocean sea surface temperature in shaping the natural variability in the flow of Nile River

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Abstract

A significant fraction of the inter-annual variability in the Nile River flow is shaped by El Niño Southern Oscillation (ENSO). Here, we investigate a similar role for the Indian Ocean (IO) sea surface temperature (SST) in shaping the inter-annual variability of the Nile River flow. Using observations of global SST distribution and river flow in addition to atmospheric general circulation model sensitivity experiments, we show that North and Middle IO SSTs play a significant intermediate role in the teleconnection between ENSO and the Nile flow. Applying partial coherency analyses, we demonstrate that the connection between North and Middle IO SSTs and Nile flow is strongly coupled to ENSO. During El Niño events, SST in the North and Middle IO increases in response to the warming in the Tropical Eastern Pacific Ocean and forces a Gill-type circulation with enhanced westerly low-level flow over East Africa and the Western IO. This anomalous low-level flow enhances the low-level flux of air and moisture away from the Upper Blue Nile (UBN) basin resulting in reduction of rainfall and river flow. SSTs in the South IO also play a significant role in shaping the variability of the Nile flow that is independent from ENSO. A warming over the South IO, generates a cyclonic flow in the boundary layer, which reduces the cross-equatorial meridional transport of air and moisture towards the UBN basin, favoring a reduction in rainfall and river flow. This independence between the roles of ENSO and South IO SSTs allows for development of new combined indices of SSTs to explain the inter-annual variability of the Nile flow. The proposed teleconnections have important implications regarding mechanisms that shape the regional impacts of climate change over the Nile basin.

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References

  • Amarasekera KN, Lee RF, Williams ER, Eltahir EA (1996) B: ENSO and the natural variability in the flow of tropical rivers. J Hydrol 200:24–39

    Article  Google Scholar 

  • Beltrando G, Camberlin P (1993) Interannual variability of rainfall in Eastern Horn of Africa and indicators of atmospheric circulation. Int J Climatol 13:533–546

    Article  Google Scholar 

  • Black E, Slingo J, Sperber KR (2003) An observational study of the relationship between excessively strong short rains in coastal East Africa and Indian Ocean SST. Mon Weather Rev 31:74–94

    Article  Google Scholar 

  • Camberlin P (1995) June–September rainfall in North-Eastern Africa and atmospheric signals over the tropics: a zonal perspective. Int J Climatol 15:773–783

    Article  Google Scholar 

  • Camberlin Pierre (1997) Rainfall anomalies in the source region of the Nile and their connection with the Indian summer monsoon. J Clim 10:1380–1392

    Article  Google Scholar 

  • Cole JE et al (2000) Tropical pacific forcing of decadal SST variability in the western Indian Ocean over the past two centuries. Science 287(5453):617–619

    Article  Google Scholar 

  • Conway D, Hulme M (1993) Recent fluctuations in precipitation and runoff over the Nile sub-basins and their impact on main Nile discharge. Clim Change 25:127–151

    Article  Google Scholar 

  • Dee DP et al (2011) The ERA-Interim reanalysis: configuration and performance of the data assimilation system. Q J R Meteorol Soc 137:553–597

    Article  Google Scholar 

  • ElDaw A, Salas JD, Garcia LA (2003) Long-range forecasting of the Nile River flows using climate forcing. J Appl Meteorol 42:890–904

    Article  Google Scholar 

  • ElShamy ME (2009) Impacts of climate change on Blue Nile flows using bias corrected GCM scenarios. Hydrol Earth Syst Sci 13:551–565

    Article  Google Scholar 

  • Eltahir EAB (1996) ElNino and the natural variability in the flow of the Nile River. Water Resour Res 32(1):131–137

    Article  Google Scholar 

  • Giannini A, Saravanan R, Chang P (2003) Oceanic forcing of Sahel rainfall on interannual to interdecadal time scales. Science 302:1027–1030

    Article  Google Scholar 

  • Hastenrath Stefan, Polzin Dierk, Mutai Charles (2011) Circulation mechanisms of Kenya rainfall anomalies. J Clim 24:404–412

    Article  Google Scholar 

  • IPCC (2007) The physical science basis. Contribution of working group I to the fourth assessment report of the intergovernmental panel on climate change. In: Solomon S, Qin D, Manning M, Chen Z, Marquis M, Averyt KB, Tignor M, Miller HL (eds) Climate change 2007. Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA

  • Jobson JD (1991) Applied multivariate data analysis. Volume I: regression and experimental design. Springer, New York, pp 182–185

    Book  Google Scholar 

  • Johns TC et al (2006) The new hadley centre climate model (HadGEM1): evaluation of coupled simulations. J Clim 19:1327–1353

    Google Scholar 

  • Ju J, Slingo JM (1995) The Asian summer monsoon and ENSO. Q J R Meteorol Soc 121:1133–1168

    Article  Google Scholar 

  • Kalnay E et al (1996) The NCEP/NCAR 40-year reanalysis project. Bull Am Meteorol Soc 77:437–471

    Article  Google Scholar 

  • Kawamura R (1998) A possible mechanism of the Asian summer monsoon-ENSO coupling. J Meteorol Soc Jpn 76:1009–1027

    Google Scholar 

  • Martin GM, Ringer MA, Pope VD, Jones A, Dearden C, Hinton TJ (2006) The physical properties of the atmosphere in the New Hadley Centre Global Environmental Model (HadGEM1). Part I: model description and global climatology. J Clim 19(7):1274–1301. doi:10.1175/JCLI3636.1

    Google Scholar 

  • Mitchell TD, Jones PD (2005) An improved method of constructing a database of monthly climate observations and associated high-resolution grids. Int J Climatol 25:693–712

    Google Scholar 

  • Mutai Charles C, Neil Ward M (2000) East African rainfall and the tropical circulation/convection on intraseasonal to interannual timescales. J Clim 13:3915–3939

    Article  Google Scholar 

  • Nicholson Sharon E (1997) An analysis of the ENSO signal in the tropical Atlantic and western Indian Oceans. Int J Climatol 17(4):345–375

    Article  Google Scholar 

  • Pohl B, Camberlin P (2006) Influence of the Madden–Julian oscillation on East African rainfall. Part I: intraseasonal variability and regional dependency. Q J R Meteorol Soc 132:2521–2539

    Article  Google Scholar 

  • Rayner NA, Parker DE, Horton EB, Folland CK, Alexander LV, Rowell DP, Kent EC, Kaplan A (2003) Global analyses of sea surface temperature, sea ice, and night marine air temperature since the late nineteenth century. J Geophys Res 108(D14):4407

    Article  Google Scholar 

  • Ringer MA, Martin GM, Greeves CZ, Hinton TJ, James PM, Pope VD, Scaife AA, Stratton RA, Inness PM, Slingo JM, Yang GY (2006) The physical properties of the atmosphere in the New Hadley Centre Global Environmental Model (HadGEM1). Part II: aspects of variability and regional. J Clim 19:1302–1326

    Google Scholar 

  • Shukla J, Wallace JM (1983) Numerical simulation of the atmospheric response to equatorial Pacific sea surface temperature anomalies. J Atmos Sci 40:1613–1630

    Article  Google Scholar 

  • Siam SM, Demory ME, Eltahir EAB Hydrological cycles over the Congo and upper Blue Nile basins: evaluation of general circulation models simulations and reanalysis data products. J Clim. doi:10.1175/JCLI-D-12-00404.1

  • Soman MK, Slingo J (1997) Sensitivity of the Asian summer monsoon to aspects of sea-surface-temperature anomalies in the tropical Pacific Ocean. Q J R Meteorol Soc 123:309–336

    Article  Google Scholar 

  • Taylor KE, Williamson D, Zwiers F (2000) The sea surface temperature and sea-ice concentration boundary conditions for AMIP II simulations. Technical Report 60, PCMDI

  • Tomczak M, Godfrey JS (1995) Regional oceanography: an introduction. Pregamon, London

    Google Scholar 

  • Trenberth KE (1997) The definition of El Niño. Bull Am Meteorol Soc 78:2771–2777

    Article  Google Scholar 

  • Uppala SM et al (2005) The ERA-40 re-analysis. Q J R Meteorol Soc 131:2961–3012

    Article  Google Scholar 

  • Vörösmarty CJ, Fekete B, Tucker BA (1998) River discharge database, Version 1.1 (RivDIS v 1.0 supplement). Available through the institute for the study of earth, oceans and space University of New Hampshire, Durham NH (USA)

  • Wang G, Eltahir EAB (1999) Use of ENSO information in medium and long range forecasting of the Nile floods. J Clim 12:1726–1737

    Article  Google Scholar 

  • Yang JL, Liu QY, Xie SP et al (2007) Impact of the Indian Ocean SST basin mode on the Asian summer monsoon. Geophys Res Lett 34:L02708. doi:10.1029/2006GL028571

    Article  Google Scholar 

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Authors and Affiliations

  1. Ralph M. Parsons Laboratory, Massachusetts Institute of Technology, 15 Vassar St., Cambridge, MA, 02139, USA

    Mohamed S. Siam & Elfatih A. B. Eltahir

  2. Department of Civil and Environmental Engineering and Center for Environmental Sciences and Engineering, University of Connecticut, Storrs, CT, USA

    Guiling Wang

  3. National Centre for Atmospheric Science, Department of Meteorology, University of Reading, Reading, UK

    Marie-Estelle Demory

Authors
  1. Mohamed S. Siam
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  2. Guiling Wang
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  3. Marie-Estelle Demory
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  4. Elfatih A. B. Eltahir
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Correspondence to Mohamed S. Siam.

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Siam, M.S., Wang, G., Demory, ME. et al. Role of the Indian Ocean sea surface temperature in shaping the natural variability in the flow of Nile River. Clim Dyn 43, 1011–1023 (2014). https://doi.org/10.1007/s00382-014-2132-6

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  • DOI: https://doi.org/10.1007/s00382-014-2132-6

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