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Diagnosis Of Extreme Rainfall And Temperature Event Over Rwanda (1961-2010)
This study attempted to investigate the variability of extreme rainfall and temperature over Rwanda and the associated circulation anomalies forecasting on wet and dry rainfall events between 1961 and 2010. The datasets used to achieve the objectives includes Temperature, the rainfall dataset, wind vector, pressure vertical velocity (omega) and the Indian Ocean sea surface temperature (SST). The methods used include correlation analysis, Standardized anomaly, composite analysis, and Empirical Orthogonal Functions (EOF) analysis. The results show that the mean annual cycle depict two rainy Seas ...
Projection of Future Streamflow Changes in the Pearl River Basin
Global climate change is remarkably changing the climatic patterns of the Pearl River basin and are significantly impacting the hydrological processes. Projection of future climate change impacts on steamflow variation is potential to provide scientific guidelines for sustainable water resources management and effective prevention and control for flood and drought disasters. In this study, a hydrological modeling system for assessing climate change impacts on runoffin the Pearl River basin was established and were used to simulate historical hydrological process and to project future streamflo ...
Study on the Dynamical and Thermodynamical Process Intensifying the Squall Lines over Guinea
This research investigates the dynamical and thermodynamical process of mesoscale convective system that intensifies squall lines wind speed propagation. The generation of African Easterly Waves (AEWs) and its lifecycle. The characteristics of squall lines (SLs) over West Africa (WA) which occurred In Guinea for two cases periods June 01-02 and June 13-14, 2015. In all six (6) AEWs have been tracked using reanalysis data from European Centre for Medium-Range Weather Forecasts (ECMWF). European Meteorological Satellite images (EUMETSAT) and Earth Networks WeatherBug StreamerRT were also used to ...
Analysis of aerosol optical depth (AOD) retrieved from light detection and ranging (LIDAR) and sunphotometer measurements
Aerosols are small, micrometer-sized particles, whose optical effects coupled with their impact on cloud properties is a source of large uncertainty in climate models. Aerosols when inhaled are believed to have significant and detrimental effects on human health. Their presence also affects photosynthesis and agricultural production. Aerosol measurements are urgently required for the complete understanding and modeling their role in the climate system. This study builds on the analysis of Aerosol Optical depth (AOD) using Light Detection and Ranging (LIDAR) and sun photometer measurements then ...
Aerosol Measurement by Raman Lidar
This paper examines the aerosol extinction coefficient profiles measured by Rayleigh-Raman-Mie-Lidar (RRML) system in Nanjing, China. I introduced two lidars methods (Raman and Fernald) and detection principle, and two lidars data Using Raman analysis method and Fernald analysis method to obtained aerosol extinction coefficient. Aerosol profiles at 607 nm and 532 nm over ranges from 6 km to 10 km were obtained using respectively Raman lidar and Rayleigh lidar in Nanjing.
Variability of Benin JJAS Precipitation associated with MAM SST Anomaly in the Atlantic Ocean
Precipitations vary consistently in Benin from 1981 to 2010. The present study reveals that the variation of Benin JJAS precipitation is positively correlated to MAM Sea Surface Temperature (SST) in Atlantic Ocean with correlation coefficient more than 0.7. When the SST is higher (lower) in the Atlantic Ocean, precipitation over Benin tends to be above (below) normal. The years 1988, 1989, 2003, 2007 and 2008, were wet with 1988, 2003, 2008 high SST over Tropical Southern Atlantic Ocean (STAO) while the years 1982, 1983, 1992 and 1997 formed the dry years with low SST over Tropical Southern At ...
Interannual variation monthly rainfall from May to August associated with large-scale circulation anomalies over south coast of West Africa
The southern coastal region of West Africa (SCWA) is located between 40N-80N latitudes and 100W -50E longitudes near the equator in the northern Hemisphere, the south and west are respectively equatorial and West Atlantic Ocean, and it is consisted to seven countries (Sierra Leon, Liberia, Cote d’Ivoire, Ghana, Togo, Benin and Nigeria). The rainy season starts from spring to the summer, mainly from May to October. The rainfall is very important for southern coastal of West Africa region which their economy and food supply are highly dependent on agricultural production. Understanding of previo ...
Inter annual summer rainfall variability over Zimbabwe and its possible mechanism
The variability and predictability of summer rainfall over Zimbabwe at inter-annual time scale is studied. Dry and wet seasons are identified using Zimbabwe Standardized Rainfall Index (ZRI). Seasonal rainfall and circulation patterns are investigated at inter annual time scale. The study focuses on the temporal and spatial variation of summer rainfall over Zimbabwe and tries to explain the circulation mechanisms associated with such phenomenon.
Rainfall Variability over Zimbabwe and its relation to large-scale atmosphere-ocean processes
Mamombe Vimbai - 이화여자대학교 대학원, 2016For Zimbabwe, where rain fed agriculture is the backbone of the economy, the importance of accurate rainfall seasonal forecasts cannot be overemphasized (Makarau and Jury, 1997). In fact, extremes in interseasonal variability of rainfall can significantly complicate human livelihoods. In addition, there have been predictions of increased precipitation variability and hydro-meteorological hazards such as floods, droughts, and erratic rainfall due to global warming (Field et al., 2014; Mushore, 2013a). Thus, detailed understanding of the major contributors to the rainfall variability over Zimbab ...
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The Polar Challenge: Pushing the Boundaries of Observations for Climate Research and Services
Bulletin, Vol. 64(2). WMO, 2015The cryosphere is a major indicator of global climate change and plays a fundamental role in the climate system. Despite advances in numerical modelling, the reliability of long-term climate change predictions in the Arctic and Antarctic are severely limited by the lack of systematic in situ observations of and beneath the sea ice. For this reason, the World Climate Research Programme (WCRP)1 and the Prince Albert II of Monaco Foundation are sponsoring a Polar Challenge2 that will reward the first team to complete a 2 000 km mission with an Autonomous Underwater Vehicle (AUV) under the Arctic ...
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US$5 Million International Research Grant Launched
Bulletin, Vol. 64(1). WMO, 2015The world’s population is expected to increase by a further three billion by 2050 – and 90% of that growth will be in developing countries that currently rely on existing water supplies and rainfall for food and water. The projected population growth will most likely bring global water supply to a crisis point.
Assessing the impacts of temporal resolution of precipitation forcing data on the surface energy and water balance
In urban climate research, spatial and temporal variability of precipitation is always a critical element for numerical modelling. However, the effects of temporal resolution of precipitation forcing data has received little attention. Moreover, there has always been a difference practically and theoretically in the availability of precipitation data. This study was carried out to assess the impact of temporal resolution of precipitation forcing data on the modelled surface energy and water balance using available data from a site at the Strand campus of Kings College London. Analysis has been ...
气象仪器与观测方法指南 (WMO-No. 8)
《WMO 气象仪器和观测方法指南》（WMO-No.8）第一版于1954 年出版，共十二章。此后，标准化仍然是仪器和观测方法委员会（CIMO）活动的一个关键问题。委员会不断审议指南的 内容，并确保在定期更新时纳入了反映技术的快速发展及其在气象仪器和观测方法领域的 实施的现代指导材料。
对于常规用途的大多数仪器、系统和技术，本指南是一项关键资源，提供了从最简单到最复 杂精细的描述，但不会涉及仅用于研究的方法和工具。指南的目的是给出最佳做法和程序，以及仪器和系统的基本能力，协助国家气象和水文部门或者其他感兴趣的运行观测系统的用 户编制他们的手册和程序，满足各自对测量和观察结果的特定需要。指南有意将标准化限制 在基本要求上，并将建议局限至给定仪器或测量系统不同配置最常见的一般特征，从而给 进一步发展留下广泛余地。对于有关与WIGOS 相关的仪器和观测方法的所有问题，本指南 都是权威参考。
دلیل أدوات وطرق رصد الأحوال الجویة
وصدرت الطبعة الأولى من دلیل أدوات وطرق رصد الأحوال الجویة (مطبوع المنظمة رقم 8) في عام 1954 وكانت تتألف من اثني عشر فصلاً. ومنذ ذلك الحین، ظلت مسألة التوحید القیاسي مصدر قلق ومن ھنا تواصل اللجنة استعراض محتویات .(CIMO) رئیسیاً بالنسبة لأنشطة لجنة أدوات وطرق الرصد الدلیل وتتأكد من أن عملیات التحدیث المنتظمة تشمل المواد الإرشادیة الحدیثة التي تعكس التطور السریع للتكنولوجیا وتنفیذھا في مجال أدوات وطرق رصد الأحوال الجویة
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