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首页> 外文期刊>Journal of Earth Science & Climatic Change >Analysis of Climate Variability (ENSO) and Vegetation Dynamics in Gojjam, Ethiopia
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Analysis of Climate Variability (ENSO) and Vegetation Dynamics in Gojjam, Ethiopia

机译：埃塞俄比亚戈杰姆的气候变异性（ENSO）和植被动态分析

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This study analyses the regional climate variability, especially La Ni?a or El Nino Southern Oscillation events and their impact on rainfall variability and vegetation coverage. The temporal and spatial distributions of temperature, precipitation, and vegetation coverage have been investigated for the two agricultural productive seasons from (2000–2008), using data from 11 meteorological station and MODIS satellite data in Gojjam, Ethiopia. The normalized difference vegetation index (NDVI) is widely accepted as a good indicator for providing vegetation properties and associated changes for large spatial scale. The analyses indicated that climate variability is quite common particularly in the small rainy season, Belg and continues to affect the vegetation condition in the region. The statistical correlation analysis indicated that there is a strong positive correlation between NDVI and the seasonal rainfall in most years, whereas, the temperature increase decreases the vegetation coverage in both seasons. The effect of ENSO, climate variability has been high to the regional rainfall variability in mostly of the months or years. In the fully strong El Nino or La Nina episode years like 2000 and 2002 the SST and rainfall showed positive correlation with r2 values 0.75 and 0.63, respectively. The NDVI anomaly pattern is almost similar to that of the main documented precipitation and temperature anomaly pattern associated with ENSO. The spatial and temporal analyses of basic climate elements and NDVI values for the growing season showed that NDVI and rainfall are highly variable during the 9 years period. The ENSO analyses showed an increase in seasonal vegetation coverage during El Nino episodes contrasting to La Ni?a episodes. However, there has been a rainfall delay during El Ni?o episodes in the first one or two months of Kiremt season.
机译：这项研究分析了区域气候变化，特别是拉尼娜或厄尔尼诺南部涛动事件及其对降雨变化和植被覆盖的影响。利用11个气象站的数据和埃塞俄比亚Gojjam的MODIS卫星数据，对2000年至2008年两个农业生产季节的温度，降水和植被覆盖的时空分布进行了调查。归一化植被指数（NDVI）被公认为是提供植被特性和相关的大空间尺度变化的良好指标。分析表明，气候变化非常普遍，特别是在小雨季（贝尔格），并继续影响该地区的植被状况。统计相关性分析表明，在大多数年份中，NDVI与季节性降雨之间存在很强的正相关性，而温度升高则两个季节的植被覆盖率均降低。 ENSO，气候多变性对区域降雨多变性的影响在大多数月份或数年中一直很高。在像2000年和2002年这样的完全强的El Nino或La Nina发作年中，SST和降雨分别与r2值0.75和0.63呈正相关。 NDVI异常模式几乎与与ENSO相关的主要记录的降水和温度异常模式相似。基本气候要素和NDVI值在生长季节的时空分析表明，在9年期间，NDVI和降雨量变化很大。 ENSO分析表明，与拉尼娜事件相比，厄尔尼诺现象期间季节性植被覆盖率增加。但是，在Kiremt季节的前一两个月，El Ni？o发作期间降雨有所延迟。

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