globalchange  > 全球变化的国际研究计划
DOI: 10.1002/joc.5791
Scopus记录号: 2-s2.0-85052381517
论文题名:
Assessing the impact of El Niño–Southern Oscillation on South African temperatures during austral summer
作者: Lakhraj-Govender R.; Grab S.W.
刊名: International Journal of Climatology
ISSN: 8998418
出版年: 2019
卷: 39, 期:1
起始页码: 143
结束页码: 156
语种: 英语
英文关键词: El Niño ; La Niña ; South Africa ; surface air temperatures ; teleconnections
Scopus关键词: Atmospheric pressure ; Correlation methods ; Minimum temperatures ; Pearson correlation coefficients ; South Africa ; Southern oscillation ; Statistical significance ; Surface air temperatures ; Teleconnections ; Temperature anomaly ; Climatology ; air temperature ; coastal zone ; El Nino-Southern Oscillation ; regional climate ; summer ; surface temperature ; teleconnection ; temperature anomaly ; warming ; South Africa
英文摘要: Using composite analysis, the timing and extent of El Niño–Southern Oscillation (ENSO) impacts on maximum (T max ) and minimum temperatures (T min ) during austral summer are investigated for South Africa over the period 1940–2016. Pearson correlation coefficients determined between temperature data at stations within regions indicate that temperature records are coherent. During austral summer, composite analysis exhibits positive T max /T min anomalies for El Niño years while negative anomalies are recorded during La Niña years across all regions of South Africa. Statistical significance of composite average temperature anomalies was determined using the Student's t-test. T max for El Niño years are significantly different from the neutral years over the central interior of South Africa for the period 1940–2016. The most notable finding of this study is that El Niño events have had a stronger warming effect during austral summer over many regions in South Africa after the late 1970s, than before. Such an impact has been most prominent over the northern and central interior regions, where, respectively, associated T max record an average of 1.1 °C and 0.73 °C higher values for the period 1979–2016 compared to the earlier period (1940–1978). Chi-squared statistics indicate that ENSO phases exert a stronger influence on temperatures over the interior of South Africa than along the coast. © 2018 Royal Meteorological Society
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/116690
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作者单位: School of Environmental, Water and Earth Sciences, Tshwane University of Technology, Pretoria, South Africa; School of Geography, Archaeology and Environmental Studies, University of the Witwatersrand, Johannesburg, South Africa

Recommended Citation:
Lakhraj-Govender R.,Grab S.W.. Assessing the impact of El Niño–Southern Oscillation on South African temperatures during austral summer[J]. International Journal of Climatology,2019-01-01,39(1)
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