期刊
INTERNATIONAL JOURNAL OF CLIMATOLOGY
卷 37, 期 2, 页码 963-971出版社
WILEY
DOI: 10.1002/joc.4752
关键词
Zimbabwe; rainfall variability; correlation; atmospheric circulation; empirical orthogonal function; sea surface temperature; ENSO
资金
- Korea Meteorological Administration Research and Development Program [KMIPA2015-6110]
- Korea Ministry of Environment (MOE) as Public Technology Program based on Environmental Policy [201200016003]
- Korea Meteorological Institute (KMI) [KMIPA2015-6110] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The relationship between interannual variability of Zimbabwe rainfall and atmosphere-ocean interaction processes is established using high-resolution rainfall station datasets. Empirical orthogonal function (EOF) analysis is used to extract the spatiotemporal modes that explain most of the variations in the rainfall pattern. Results suggest strong homogeneity in the rainfall pattern that is dominantly described by EOF mode 1. The correlation analysis of mode 1 with sea surface temperatures (SSTs) supports the assumption that El Nino Southern Oscillation (ENSO) has a significant influence on Zimbabwe summer rainfall. Significant correlations exist between rainfall and SSTs over large regions of the tropical Indian and Pacific Oceans. The seasonal response of rainfall to the southern annular mode is reflected in both modes 1 and 2. Mode 1 suggests homogeneity in rainfall variations within the country and mode 2 describes the north-south rainfall fluctuations in the country. Although the magnitudes of their loadings are small, modes 3 and 4 extracted distinct rainfall regions within the country. This could be attributed to the use of more reliable, higher resolution rainfall data. These findings will assist to bring profound improvements to seasonal rainfall forecasting techniques around the country.
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