Abstract Climate variability, expressed by random short time variation in rainfall and temperature, has severe effects on agriculture in the Sahel. This region depends on a short and uncertain rainy season with many uncertainties in short-term climate variations that affect farm decisions in regards to. sowing period, crop variety, water management, etc. The most conspicuous climate variability issue in West Africa is the high intra-seasonal and inter-annual variability associated with dry (or too wet) spells, and in most cases, season length modifications. We derived selected climate descriptors from 35-year daily climate data to assess inter-annual rainfall anomalies, seasonal variation and temperature trends in southern Burkina Faso. Results show the evolution in the number of rainy days and rainfall sum from the drier years in the late 1970s and early 1980s, which were followed by positive but variable rainfall in the 1990s and 2000s. We further observed widespread occurrence of unsuccessful season onsets in more than 50% of the study period. Short dry spells of 5–10 days dominate most of the years with longer spells at onset shortening the season. The results could be used to orientate interventions aimed at providing well-packaged forecasts for adaptation needs.

中文翻译：

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用于布基纳法索南部气候变率多维分析的高时间分辨率气象数据的叠加

摘要 以降雨和温度的短时间随机变化表示的气候变率对萨赫勒地区的农业产生严重影响。该地区依赖于短暂且不确定的雨季，短期气候变化存在许多不确定性，这些变化会影响农业决策。播种期、作物品种、水管理等。西非最显着的气候变率问题是与干旱（或太湿）期以及在大多数情况下，季节长度变化相关的高季节内和年际变化。我们从 35 年的每日气候数据中导出了选定的气候描述符，以评估布基纳法索南部的年际降雨异常、季节变化和温度趋势。结果表明，从 1970 年代末和 1980 年代初的干旱年份开始，雨天数和降雨量总和的演变，随后是 1990 年代和 2000 年代的正但可变降雨量。我们进一步观察到在超过 50% 的研究期间普遍发生了不成功的赛季开始。5-10 天的短暂干旱占主导地位，在开始时较长的干旱缩短了季节。结果可用于确定干预措施的方向，旨在为适应需求提供完善的预测。