𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Trends and spatial distribution of annual and seasonal rainfall in Ethiopia

✍ Scribed by Wing H. Cheung; Gabriel B. Senay; Ashbindu Singh

Publisher
John Wiley and Sons
Year
2008
Tongue
English
Weight
572 KB
Volume
28
Category
Article
ISSN
0899-8418

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

As a country whose economy is heavily dependent on low‐productivity rainfed agriculture, rainfall trends are often cited as one of the more important factors in explaining various socio‐economic problems such as food insecurity. Therefore, in order to help policymakers and developers make more informed decisions, this study investigated the temporal dynamics of rainfall and its spatial distribution within Ethiopia. Changes in rainfall were examined using data from 134 stations in 13 watersheds between 1960 and 2002. The variability and trends in seasonal and annual rainfall were analysed at the watershed scale with data (1) from all available years, and (2) excluding years that lacked observations from at least 25% of the gauges. Similar analyses were also performed at the gauge, regional, and national levels. By regressing annual watershed rainfall on time, results from the one‐sample t‐test show no significant changes in rainfall for any of the watersheds examined. However, in our regressions of seasonal rainfall averages against time, we found a significant decline in June to September rainfall (i.e. Kiremt) for the Baro‐Akobo, Omo‐Ghibe, Rift Valley, and Southern Blue Nile watersheds located in the southwestern and central parts of Ethiopia. While the gauge level analysis showed that certain gauge stations experienced recent changes in rainfall, these trends are not necessarily reflected at the watershed or regional levels. Copyright © 2008 Royal Meteorological Society

📜 SIMILAR VOLUMES

Trend detection of annual and seasonal r
Trend detection of annual and seasonal rainfall in Calabria (Southern Italy)
✍ Tommaso Caloiero; Roberto Coscarelli; Ennio Ferrari; Marco Mancini 📂 Article 📅 2010 🏛 John Wiley and Sons 🌐 English ⚖ 729 KB

## Abstract In order to investigate the behaviour of climatic and hydrological variables, several statistical and stochastic techniques are currently applied to time series. In the present study a statistical analysis of annual and seasonal precipitation has been performed over 109 cumulated rainfa

Trend analysis of annual and seasonal ra
Trend analysis of annual and seasonal rainfall time series in the Mediterranean area
✍ Antonia Longobardi; Paolo Villani 📂 Article 📅 2009 🏛 John Wiley and Sons 🌐 English ⚖ 379 KB

## Abstract Precipitation trend analysis, on different spatial and temporal scales, has been of great concern during the past century because of the attention given to global climate change by the scientific community. According to some recent studies, the Italian territory has been suffering a pre

Assessment of GCM simulations of annual
Assessment of GCM simulations of annual and seasonal rainfall and daily rainfall distribution across south-east Australia
✍ J. Vaze; J. Teng; F. H. S. Chiew 📂 Article 📅 2010 🏛 John Wiley and Sons 🌐 English ⚖ 532 KB

## Abstract Global warming can potentially lead to changes in future rainfall and runoff and can significantly impact the regional hydrology and future availability of water resources. All the large‐scale climate impact studies use the future climate projections from global climate models (GCMs) to

Detection of trends in annual extreme ra
Detection of trends in annual extreme rainfall
✍ Kaz Adamowski; John Bougadis 📂 Article 📅 2003 🏛 John Wiley and Sons 🌐 English ⚖ 251 KB

## Abstract Information on intensity–duration–frequency of rainfall is commonly required for a variety of hydrologic applications. In this study, trends are estimated for different durations of annual extreme rainfall using the regional average Mann–Kendall __S__ trend test. The method of L‐moments

Spatial variations and trends in the Ind
Spatial variations and trends in the Indian monsoon rainfall
✍ I. Subbaramayya; C. V. Naidu 📂 Article 📅 1992 🏛 John Wiley and Sons 🌐 English ⚖ 783 KB

## Abstract The spatial and temporal variations of the monsoon rainfall over India have been studied using the subdivisional rainfall data for the years 1871–1988. North‐west India and north peninsular India are found to constitute two homogeneous regions. North‐east India does not constitute a sin

Seasonality and spatial pattern of rainf
Seasonality and spatial pattern of rainfall of Sri Lanka: Exploratory factor analysis
✍ P. Wickramagamage 📂 Article 📅 2009 🏛 John Wiley and Sons 🌐 English ⚖ 437 KB

## Abstract This analysis is based on monthly means of rainfall at a dense network of gauging stations in Sri Lanka. The mean monthly values of rainfall at 646 stations were used as variables to characterise the individual stations. These variables show a significant correlation among most of them.