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首页> 外文期刊>African Journal of Food, Agriculture, Nutrition and Development >Effects of june winds on rainfall in the coastal region of kenya
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Effects of june winds on rainfall in the coastal region of kenya

机译：六月风对肯尼亚沿海地区降雨的影响

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Although the equatorial Eastern region of Africa is adjacent to the Indian Ocean, it tends to exhibit a drier climate rather than one characterized by abundant tropical rains. A number of studies on rainfall variability in the East African region have tended to suggest a stronger influence of local factors in controlling rainfall amounts and their characteristics rather than the global wind circulation system. A climatic phenomenon that is locally termed “June winds” is unique to East Africa’s coastal region. The study mainly involved analysing rainfall anomalies and means of 39- year meteorological data from the region and data from earlier studies about the region. The results indicate that June winds occur annually after the onset of long rains between the months of May and June. They impart subsidence, drying and cloud free conditions, altering the climatological properties in the areas they traverse. The attainment of peak June wind velocities causes a characteristic depression in rainfall probability and amounts on their course, similar to the ‘Ganges depression’ of temperatures in the Indian subcontinent, which in turn affects available soil moisture for crop growth. The results also reveal existence of years of “above-normal rains” (herein referred to as El Ni?o years) and years of “below-normal rains” (herein referred to as La Ni?a years) which are associated and modulated by El Ni?o southern oscillation. They also reveal that drought years tend to occur in succession and that the June winds tend to be suppressed or absent during El Ni?o years, but strongly associate with La Ni?a years. The study suggests that the frequency and therefore the ratio of La Ni?a years to El Ni?o years have been increasing. The study also suggests possibility of developing a decision support system for farmers in resource use and allocation based predicted time of occurrence of the June winds. Key words : Low level, Jet, Rainfall, Kenya
机译：尽管非洲的赤道东部地区毗邻印度洋，但它倾向于表现出较干燥的气候，而不是具有丰富的热带降雨的气候。关于东非地区降雨变化的许多研究倾向于表明，局部因素在控制降雨量及其特征方面的影响更大，而不是全球风循环系统。东非沿海地区特有一种被称为“六月风”的气候现象。该研究主要涉及分析该地区的降水异常和39年气象数据的手段以及该地区早期研究的数据。结果表明，每年的六月风发生在五月至六月之间的长降雨开始之后。它们赋予沉降，干燥和无云的条件，从而改变了它们经过的区域的气候特性。达到六月风速峰值会导致降雨概率和降雨过程的特征性下降，这与印度次大陆的温度“恒河下降”相似，反过来又影响了作物生长所需的土壤水分。结果还揭示了存在并关联并调制的“正常降雨以上”年份（此处称为厄尔尼诺年份）和“低于正常降雨”年份（以下称为La Ni？a年）的存在。由厄尔尼诺南部振荡。他们还揭示出干旱年趋于连续发生，在厄尔尼诺年期间，六月风趋于被抑制或消失，但与拉尼奥年紧密相关。这项研究表明，拉尼娜年与厄尔尼诺年的频率以及比率都在增加。这项研究还表明，有可能在基于六月风的预测发生时间的资源使用和分配方面为农民开发决策支持系统。关键词：低空急流降雨肯尼亚

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