Recent changes in dry spell and extreme rainfall events in Ethiopia

SummaryThis paper assesses recent changes in extremes of seasonal rainfall in Ethiopia based on daily rainfall data for 11 key stations over the period 1965–2002. The seasons considered are Kiremt (‘main rains’, June–September) and Belg (‘small rains’, February/March–May). The Mann-Kendall and linear regression trend tests show decreasing trends in the Kiremt and the Belg extreme intensity and maximum consecutive 5-day rains over eastern, southwestern and southern parts of Ethiopia whereas no trends are found in the remaining part of Ethiopia. In general, no trends are found in the yearly maximum length of Kiremt and Belg dry spells (days with rainfall below 1 mm) over Ethiopia.

[1]  D. Easterling,et al.  Observed variability and trends in extreme climate events: A brief review , 2000 .

[2]  Michele Brunetti,et al.  Changes in total precipitation, rainy days and extreme events in northeastern Italy , 2001 .

[3]  N. Nicholls,et al.  TRENDS IN EXTREME RAINFALL INDICES FOR AN UPDATED HIGH QUALITY DATA SET FOR AUSTRALIA, 1910-1998 , 2000 .

[4]  Takayuki Okatani,et al.  Diurnal variations of rainfall over Niger in the West African Sahel: a comparison between wet and drought years , 1999 .

[5]  Neville Nicholls,et al.  Trends in extreme daily rainfall and temperature in Southeast Asia and the South Pacific: 1961–1998 , 2001 .

[6]  R. Sneyers.  On the statistical analysis of series of observations. , 1991 .

[7]  Dominique Tapsoba,et al.  Rainfall Variability in West Africa during the Years 1950-90 , 2002 .

[8]  Y. Seleshi,et al.  Recent changes in rainfall and rainy days in Ethiopia , 2004 .

[9]  K. Hennessy,et al.  Trends in total rainfall, heavy rain events and number of dry days in Australia, 1910–1990 , 1998 .

[10]  Gillian M. Mimmack,et al.  Changes in Extreme Rainfall Events in South Africa , 1999 .

[11]  Thomas R. Karl,et al.  Secular Trends of Precipitation Amount, Frequency, and Intensity in the United States , 1998 .

[12]  R. Yamamoto,et al.  NOTES AND CORRESPONDENCE : A Statistical Analysis of the Extreme Events : Long-Term Trend of Heavy Daily Precipitation , 1993 .

[13]  M. Collins,et al.  Projections of future climate change , 2002 .

[14]  Kevin E. Trenberth,et al.  Atmospheric Moisture Residence Times and Cycling: Implications for Rainfall Rates and Climate Change , 1998 .

[15]  P. Jones,et al.  Observed trends in the daily intensity of United Kingdom precipitation. , 2000 .

[16]  Ming-ko Woo,et al.  Changes in rainfall characteristics in northern Nigeria , 1998 .

[17]  M. J. Salinger,et al.  Trends in extreme daily rainfall across the South Pacific and relationship to the South Pacific Convergence Zone , 2003 .

[18]  N. Nicholls,et al.  Changes in Climate Extremes Over the Australian Region and New Zealand During the Twentieth Century , 1999 .

[19]  D. Easterling,et al.  Homogeneity adjustments of in situ atmospheric climate data: a review , 1998 .

[20]  M. Colacino,et al.  Trends in the daily intensity of precipitation in Italy from 1951 to 1996 , 2001 .

[21]  M. Haylock,et al.  Observed coherent changes in climatic extremes during the second half of the twentieth century , 2002 .