检索结果-南通市图书馆

Comparison of Rainy Season Onset, Cessation and Duration for Ghana from RegCM4 and GMet Datasets

Atmospheric and Climate Sciences 2016年第2期6卷 300-309页

作者： Caleb.Mensah Leonard K. Amekudzi nana ama b. klutse Jeffrey N. A. Aryee Kofi Asare Ghana Meteorological Agency Accra Ghana Meteorology and Climate Science Unit Department of Physics Kwame Nkrumah University of Science and Technology Kumasi Ghana Remote Sensing GIS and Climate Center Ghana Space Science and Technology Institute Accra Ghana

The socio-economic sector of West African countries is rain-fed agriculture driven. Information regarding the onset, cessation and duration of the rainy season is thus, very essential. In this paper, a comparison of the onset, cessation and duration of the rainy season has b.en carried out using simulated rainfall data from the fourth generation Regional Climate Model (RegCM4) and rain gauge measurements from Ghana Meteorological Agency (GMet), covering a period of 1998 to 2012. Similar onset and cessation dates were seen in b.th the simulated and guage rainfall measurements for the various agro-ecological zones, resulting in similar duration of the rainy season. The average duration of the rainy season were less than 200 days for the savannah and coastal zones whereas the duration of the rainy season were b.yond 200 days for the forest and transition zones. The b.as of these comparisons was less than 30 days and the root mean square error (RMSE) values were less than 15 days for all stations, except Saltpond. The Pearson’s correlation (r) typically ranged b.tween 0.4 and 0.8. However, negative correlations were ob.erved for Tamale in the savannah zone, and the entire coastal zone. These findings are indications that RegCM4 has the potential to clearly simulate the movement of the rain b.lt, and thus, could fairly determine the onset, cessation and duration of the rainy season. The findings have significant contrib.tions to effective water resource management and food security in Ghana, as the thriving of these sectors depend on the dynamics of the rainfall seasons.

关键词： Onset Cessation Duration of Rainy Season GMet Ghana RegCM4

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Simulation of the Rainfall Regime over Ghana from CORDEX

引用

International Journal of Geosciences 2013年第4期4卷 785-791页

作者： Kwadwo Owusu nana ama b.owne klutse Department of Geography and Resource Development University of Ghana Accra Ghana Ghana Space Science and Technology Center Ghana Atomic Energy Commission Accra Ghana

This paper investigates how well the rainfall regime on which many livelihoods depend, in Ghanais well represented b. the Coordinated Regional Climate Downscaling Experiment (CORDEX). The ob.ective of the study is to demonstrate how well the ten CORDEX models are ab.e to capture the spatial and temporal rainfall seasonality over the southern and northern sub.sections ofGhana. The choice of the sub.sections is b.sed on the fact that south of 8°N experiences a b.-modal rainfall regime while the north has a uni-modal regime. The results indicate that the rainfall overGhanais associated with high levels of variab.lity at the inter-annual time scale. Particularly over the southern part ofGhana, all the models follow the same trend as represented overGhanawith similar rainfall values as the ob.ervation. Over the northern part ofGhana, models record relatively low rainfall agreeing with the ob.ervation. However, most of the models overestimate the northern region rainfall as it is in the case of the southern Ghana. CORDEX as shown in this analysis could b. useful in providing Ghana with at least 10 different model outputs for impact analysis. Caution is however given that, since individual models give different performance and the fact that models in general have their inherent deficiencies, an ensemb.e mean of the models could provide a b.tter result.

关键词： CORDEX Rainfall Modelling Climate Change Climate Variab.lity Climate Prediction Ghana

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Assessment of Patterns of Climate Variab.es and Malaria Cases in Two Ecological Zones of Ghana

引用

Open Journal of Ecology 2014年第12期4卷 764-775页

作者： nana ama b.owne klutse Fred Ab.agye-Antwi Kwadwo Owusu Yaa Ntiamoa-b.idu Ghana Space Science and Technology Institute Ghana Atomic Energy Commission Accra Ghana Department of Animal b.ology and Conservation Science University of Ghana Legon Ghana Department of Geography and Resource Development University of Ghana Legon Ghana Centre for African Wetlands University of Ghana Legon Ghana

Climate change is projected to impact human health, particularly incidence of water related and vector b.rne diseases, such as malaria. A b.tter understanding of the relationship b.tween rainfall patterns and malaria cases is thus required for effective climate change adaptation strategies involving planning and implementation of appropriate disease control interventions. We analyzed climatic data and reported cases of malaria spanning a period of eight years (2001 to 2008) from two ecological zones in Ghana (Ejura and Winneb. in the transition and coastal savannah zones respectively) to determine the association b.tween malaria cases, and temperature and rainfall patterns and the potential effects of climate change on malaria epidemiological trends. Monthly peaks of malaria caseloads lagged b.hind monthly rainfall peaks. Correlation b.tween malaria caseloads and rainfall intensity, and minimum temperature were generally weak at b.th sites. Lag correlations of up to four months yielded b.tter agreement b.tween the variab.es, especially at Ejura where a two-month lag b.tween malaria caseloads and rainfall was significantly high b.t negatively correlated (r = -0.72;p value b.t weaker relationship at Winneb., (r = -0.51). On the other hand, a positive significant correlation (r = 0.68, p value b.tween malaria caseloads and maximum temperature was ob.erved for Ejura at a four-month lag, while Winneb. showed a strong correlation (r = 0.70;p value b.tween the parameters at a two-month lag. The results suggest maximum temperature as a b.tter predictor of malaria trends than minimum temperature or precipitation, particularly in the transition zone. Climate change effects on malaria caseloads seem multi-factorial. For effective malaria control, interventions could b. synchronized w

关键词： Malaria Rainfall Temperature Climate Change Ecological Zone

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Changes in Rainfall Characteristics in Wenchi and Saltpond Farming Areas of Ghana

引用

International Journal of Geosciences 2017年第3期8卷 305-317页

作者： Kwesi Akumenyi Quagraine nana ama b.owne klutse Francis Nkrumah David Cudjoe Adukpo Kwadwo Owusu Department of Physics University of Cape Coast Cape Coast Ghana Ghana Space Science and Technology Institute Ghana Atomic Energy Commission Accra Ghana Geography Department University of Ghana Accra Ghana

Ghana’s economy heavily relies on agriculture, which is predominantly rainfed across its agro-ecological zones. As a result of this, it is vulnerab.e to rainfall variab.lity, which tends to have a major impact on the industrial and agricultural production sectors of the country. This study investigates the variations occurring across two major farming areas (Wenchi and Saltpond) within the Transition and Coastal Savannah agro-ecological zones of Ghana respectively. Rainfall variations are studied with rainfall data from 1968-2011 from Ghana Meteorological Agency (GMet). The rainfall analysis is done over two Climatological Periods (CP), 1968-1989 as CP1 and 1990-2011 as CP2. This study uses two climatic extreme indices as well as rainfall amounts and onset over these two agro-ecological zones to investigate the changes that have occurred in rainfall. The study found that in the Coastal agro-ecological zone, CP1 had a decreasing rainfall trend as compared to CP2 with higher variations in Saltpond. In the Transition agro-ecological zone, Wenchi, CP1 also exhib.ted a decreasing trend as compared to CP2. In addition, onset of rains in Saltpond mostly occurred in May for CP1 b.t for CP2, it oscillated b.tween April and May. For Wenchi, onset of rains was in March for CP1 and predominantly April for CP2. In going forward, farmers in these agro-ecological zones should b. supported to practice effective adaptation and mitigation measures so as to improve their yields in this challenging climate.

关键词： Climate Variab.lity Rainfall Extreme Onset Agro-Ecological Zones Ghana

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rainfall Variab.lity over Ghana: Model versus Rain Gauge Ob.ervation

引用

International Journal of Geosciences 2014年第7期5卷 673-683页

作者： Francis Nkrumah nana ama b.owne klutse David Cudjoe Adukpo Kwadwo Owusu Kwesi Akumenyi Quagraine Alfred Owusu William Gutowski Department of Geography and Resource Development University of Ghana Legon Ghana Department of Physics University of Cape Coast Cape Coast Ghana Ghana Space Science and Technology Institute Ghana Atomic Energy Commission Accra Ghana Department of Geological and Atmospheric Sciences Iowa State University Iowa USA

This paper used the International Centre for Theoretical Physics (ICTP) Regional Climate Model, Version 3 (RegCM3) and rain gauge data selected from the Ghana Meteorological Agency (GMet) from 1990 to 2008 to investigate the extent and nature of variab.lity in the annual rainfall and pattern of the raining seasons in Ghana. In the study, six meteorological stations selected from three rainfall distrib.tion zones according to the divisions of the GMet were used to study the pattern of rainfall and its departure from the normal trend. The study also assessed the performance of the RegCM3 simulation with reference to the ob.erved gauge data. Results confirmed the unimodal nature of the rainfall annual cycle over the northern b.lt and b.-modal rainfall nature over the middle and southern b.lts of Ghana. Negative departures of rainfall implying consistent downward trend were ob.erved at all the stations. Our analysis showed that RegCM3 captured the average rainfall over Ghana b.t demonstrated an underestimation as compared to the ob.erved gauge data. The model also had difficulty stimulating the departures accurately in direction and in magnitude in all the stations except for Accra where RegCM3 simulated the right direction of the departures.

关键词： Rainfall Variab.lity Ghana RegCM3 Temporal Rainfall Distrib.tion Rain Gauge Data

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：