Associations between Grain Crop Yields in Central-Eastern Argentina and El Niño–Southern Oscillation
Open Access
- 1 October 1999
- journal article
- Published by American Meteorological Society in Journal of Applied Meteorology and Climatology
- Vol. 38 (10) , 1488-1498
- https://doi.org/10.1175/1520-0450(1999)038<1488:abgcyi>2.0.co;2
Abstract
Associations are investigated between yields of major crops in the Argentine Pampas (central-eastern Argentina) and El Niño–Southern Oscillation (ENSO) phase. For maize and sorghum, higher (lower) yield anomalies occur more frequently than expected by chance alone during warm (cold) ENSO events. For both crops, the depression of yields during cold events is, on average, larger and less variable than yield increases are during warm events. A yield decrease during cold events also is observed in soybean yields, although the effect of warm events is not statistically significant. There is a marginally significant tendency for low sunflower yields to occur less frequently than expected during cold events. Wheat, the only winter crop considered, did not show an association with ENSO. Precipitation anomalies during October–February (the period with strongest ENSO signal in the Pampas) are summarized through principal component analysis. Precipitation anomalies during November–January are significantly ... Abstract Associations are investigated between yields of major crops in the Argentine Pampas (central-eastern Argentina) and El Niño–Southern Oscillation (ENSO) phase. For maize and sorghum, higher (lower) yield anomalies occur more frequently than expected by chance alone during warm (cold) ENSO events. For both crops, the depression of yields during cold events is, on average, larger and less variable than yield increases are during warm events. A yield decrease during cold events also is observed in soybean yields, although the effect of warm events is not statistically significant. There is a marginally significant tendency for low sunflower yields to occur less frequently than expected during cold events. Wheat, the only winter crop considered, did not show an association with ENSO. Precipitation anomalies during October–February (the period with strongest ENSO signal in the Pampas) are summarized through principal component analysis. Precipitation anomalies during November–January are significantly ...Keywords
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