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首页> 外文期刊>Surveys in Geophysics: An International Review Journal of Geophysics and Planetary Sciences >Investigation of El Nino and La Nina effects and the impact of Atlantic sea surface temperatures (SSTs), on precipitation in Nigeria from 1950 to 1992
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Investigation of El Nino and La Nina effects and the impact of Atlantic sea surface temperatures (SSTs), on precipitation in Nigeria from 1950 to 1992

机译：对1950至1992年尼日利亚的El Nino和La Nina效应以及大西洋海面温度（SSTs）对尼日利亚降水的影响进行的调查

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摘要

Monthly precipitation data from meteorological stations in Nigeria are analysed from 1950 to 1992, in relation to sea surface temperatures (SSTs) in the tropical Pacific and Atlantic Oceans. The analyses have shed some light on understanding the variability of rainfall anomalies observed in Nigeria for this period. The correlation values between rainfall anomaly indices (RAI) and different meteorological indices are not all significant. Thus, the analyses show some indication that rainfall in Nigeria is associated with El Nino-related circulation and rainfall anomalies. The low correlations between RAI and SST in the Pacific confirm low correlations between rainfall and southern oscillation indices (SOI). SST correlations in the tropical Atlantic suggest that warm surface water in this part of the Atlantic moves the Inter Tropical Convergence Zone (ITCZ) southward and away from the SouthEast of Nigeria, indicating less rainfall, while, in SouthWest of Nigeria, the warm surface waters in this part of the Atlantic are likely to be responsible for a more northern position of the ITCZ, which produces more rainfall. The lower correlation in Northern Nigeria may be attributed to its continentality, away from the influence of the sea surface conditions in the Gulf of Guinea and the tropical Atlantic. The drought, or rainfall, cycles in Northern Nigeria are more closely connected to the land surface conditions in the nearby Sahel region.
机译：相对于热带太平洋和大西洋的海表温度（SST），分析了1950至1992年尼日利亚气象站的月降水量数据。这些分析为了解该时期在尼日利亚观测到的降雨异常的变化提供了一些启示。降雨异常指数（RAI）和不同的气象指数之间的相关性值并不均很显着。因此，分析表明，尼日利亚的降雨与厄尔尼诺现象有关的环流和降雨异常有关。太平洋地区的RAI和SST之间的低相关性证实了降雨与南部振荡指数（SOI）之间的低相关性。热带大西洋中海温的相关性表明，大西洋这部分地区的温暖地表水使热带辐合带（ITCZ）向南移动并远离尼日利亚东南部，表明降雨量减少，而在尼日利亚西南部，温暖地表水在大西洋这部分地区，可能是ITCZ的北部位置，这会产生更多的降雨。尼日利亚北部较低的相关性可能归因于其大陆性，不受几内亚湾和热带大西洋海面条件的影响。尼日利亚北部的干旱或降雨周期与附近萨赫勒地区的地表条件更为紧密相关。

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