文章基本信息

标题：Projections of precipitation, air temperature and potential evapotranspiration in Rwanda under changing climate conditions
本地全文：下载
作者：Mohammed Haggag ; Jean Claude Kalisa ; Ahmad Wagdy Abdeldayem 等
期刊名称：African Journal of Environmental Science and Technology
电子版ISSN：1996-0786
出版年度：2016
卷号：10
期号：1
页码：18-33
DOI：10.5897/AJEST2015.1997
语种：English
出版社：Academic Journals
摘要：Precipitation and air temperature records from 6 sites in Rwanda in the period from 1964 to 2010 are used for past/present climate assessment. Future climate projections (2010-2099) based on 3 general circulation models and 2 emission scenarios (A2 and B1) are used for climate projections. Precipitation, air temperature, and potential evapotranspiration based on ccma_cgcm3_1.1; miroc3_2medres and mpi_echam5.1 models are used in the analysis. Observed air temperatures suggested warming pattern over the past 40 years at an average of 0.35°C per decade. Rainfall records show no significant trend in the considered period. The potential evapotranspiration has an increasing trend and exceeds the precipitation in the months of June to September. Climate projections indicate trend towards a warmer and wetter climate. Increases in mean temperature are projected under all models and scenarios, while all models also indicate increases in annual rainfall totals. Despite of the projected wetter climate, the increase in potential evapotranspiration will overrule during the 21st century resulting in deficit in water availability for the rainfed agriculture. Deficit periods in which potential evapotranspiration exceeds precipitation will be extended to 10 months at some parts in the country instead of 4 months at present.
关键词：Climate change; Rwanda; hillside irrigation; air temperature; precipitation; potential evapotranspiration