El Nino Southern Oscillation (ENSO)-related variablity in mean-monthly streamflow in Nepal

Abstract Harmonic analysis is used to examine the impact of the El Nino/Southern Oscillation (ENSO) on mean-monthly streamflow variability in Nepal. El Nino causes below normal streamflows in two core regions: the Western Region and the Eastern Region. La Nina produces above normal streamflows in only one core region: the Western Region. There is a stronger El Nino influence on streamflows compared to La Nina. A stronger overall ENSO impact in western Nepal than in eastern Nepal suggests an inverse relationship between El Nino streamflows and monsoon strength and a direct relationship between La Nina flows and monsoon strength.

[1]  Daniel R. Cayan,et al.  ENSO and Hydrologic Extremes in the Western United States , 1999 .

[2]  R. Kostaschuk,et al.  Links between the Southern Oscillation Index and Hydrological Hazards on a Tropical Pacific Island , 2001 .

[3]  O. P. Singh.  Multivariate ENSO index and Indian monsoon rainfall: relationships on monthly and subdivisional scales , 2001 .

[4]  John A. Dracup,et al.  An analysis of the feasibility of long-range streamflow forecasting for Colombia using El Niño Southern Oscillation indicators , 2001 .

[5]  T. McMahon,et al.  Global ENSO-streamflow teleconnection, streamflow forecasting and interannual variability , 2002 .

[6]  T. McMahon,et al.  El Nino/Southern Oscillation and Australian rainfall, streamflow and drought : Links and potential for forecasting , 1998 .

[7]  Robert H. Webb,et al.  El Nino/Southern Oscillation and streamflow in the western United States , 1993 .

[8]  Bin Wang,et al.  Pacific–East Asian Teleconnection: How Does ENSO Affect East Asian Climate? , 2000 .

[9]  R. Kostaschuk,et al.  Tropical cyclones and floods in Fiji , 2001 .

[10]  H. Diaz,et al.  Characteristics of the Response of Sea Surface Temperature in the Central Pacific Associated with Warm Episodes of the Southern Oscillation , 1986 .

[11]  G. Brier,et al.  Some applications of statistics to meteorology , 1958 .

[12]  J. Dracup,et al.  The influences of Type 1 El Nino and La Nina events on streamflows in the Pacific Southwest of the United States , 1994 .

[13]  C. F. Ropelewski,et al.  Precipitation Patterns Associated with the High Index Phase of the Southern Oscillation , 1989 .

[14]  Michael D. Dettinger,et al.  El Niño and the Southern Oscillation: Multiscale Streamflow Variability Associated with El Niño/Southern Oscillation , 2000 .

[15]  Arnold Court,et al.  Handbook of Statistical Methods in Meteorology , 1954 .

[16]  L. W. Pollak,et al.  Methods in Climatology , 1945, Nature.

[17]  John N. Rayner,et al.  Introduction to Spectral Analysis , 2005, Spectral Analysis for Univariate Time Series.

[18]  R. Reyment,et al.  Statistics and Data Analysis in Geology. , 1988 .

[19]  B. Bajracharya,et al.  Climatic and Hydrological Atlas of Nepal , 1996 .

[20]  S. Islam,et al.  The El Niño southern oscillation and long‐range forecasting of flows in the Ganges , 2001 .

[21]  Probable reasons for enhanced cyclogenesis in the Bay of Bengal during July–August of ENSO years , 2001 .

[22]  L. Braun,et al.  Assessment of Annual Snow Accumulation over the Past 10 Years at High Elevations in the Langtang Region , 1993 .

[23]  Chester F. Ropelewski,et al.  North American Precipitation and Temperature Patterns Associated with the El Niño/Southern Oscillation (ENSO) , 1986 .

[24]  R. P. Kane.  ENSO relationship with Indian rainfall in different months , 2000 .

[25]  S. Franks,et al.  On the identification of ENSO-induced rainfall and runoff variability: a comparison of methods and indices , 2001 .

[26]  Roy W. Koch,et al.  Surface Climate and Streamflow Variability in the Western United States and Their Relationship to Large‐Scale Circulation Indices , 1991 .

[27]  R. Fovell,et al.  Western US streamflow and atmospheric circulation patterns during El Niño-Southern Oscillation , 1997 .

[28]  M. Cane,et al.  Annual river discharge in southeastern Australia related to El Nino‐Southern Oscillation forecasts of sea surface temperatures , 1993 .

[29]  E. Kahya,et al.  The analysis of El Niño and La Niña signals in streamflows of Turkey , 2001 .

[30]  P. Waylen,et al.  Annual and seasonal fluctuations of precipitation and streamflow in the Aconcagua River basin, Chile , 1990 .

[31]  B. Goswami,et al.  Indian Monsoon–ENSO Relationship on Interdecadal Timescale , 2000 .

[32]  L. Zubair.  El Niño–southern oscillation influences on the Mahaweli streamflow in Sri Lanka , 2003 .

[33]  H. Diaz,et al.  ENSO and Climatic Variability in the Past 150 Years , 2000 .

[34]  Chester F. Ropelewski,et al.  Surface Temperature Patterns Associated with the Southern Oscillation , 1992 .

[35]  C. Ropelewski,et al.  Global and Regional Scale Precipitation Patterns Associated with the El Niño/Southern Oscillation , 1987 .

[36]  Ercan Kahya,et al.  U.S. streamflow patterns in relation to the El Niño/Southern Oscillation , 1993 .

[37]  Peter R. Waylen,et al.  El Niño and annual floods on the north Peruvian littoral , 1986 .

[38]  M. L. Shrestha.  Interannual variation of summer monsoon rainfall over Nepal and its relation to Southern Oscillation Index , 2000 .