Publication Abstracts
McCabe et al. 2012
McCabe, G.J., T.R. Ault,
, J.L. Betancourt, and M.D. Schwartz, 2012: Influences of the El Niño Southern Oscillation and the Pacific Decadal Oscillation on the timing of the North American spring. Int. J. Climatol., 32, 2301-2310, doi:10.1002/joc.3400.Detrended, modelled first leaf dates for 856 sites across North America for the period 1900-2008 are used to examine how the El Niño Southern Oscillation (ENSO) and the Pacific Decadal Oscillation (PDO) separately and together might influence the timing of spring. Although spring (mean March through April) ENSO and PDO signals are apparent in first leaf dates, the signals are not statistically significant (at a 95% confidence level (p < 0.05)) for most sites. The most significant ENSO/PDO signal in first leaf dates occurs for El Niño and positive PDO conditions. An analysis of the spatial distributions of first leaf dates for separate and combined ENSO/PDO conditions features a northwest-southeast dipole that is significantly (at p < 0.05) different than the distributions for neutral conditions. The nature of the teleconnection between Pacific SST's and first leaf dates is evident in comparable composites for detrended sea level pressure (SLP) in the spring months. During positive ENSO/PDO, there is an anomalous flow of warm air from the southwestern US into the northwestern US and an anomalous northeasterly flow of cold air from polar regions into the eastern and southeastern US. These flow patterns are reversed during negative ENSO/PDO. Although the magnitudes of first leaf date departures are not necessarily significantly related to ENSO and PDO, the spatial patterns of departures are significantly related to ENSO and PDO. These significant relations and the long-lived persistence of SSTs provide a potential tool for forecasting the tendencies for first leaf dates to be early or late.
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BibTeX Citation
@article{mc07000g, author={McCabe, G. J. and Ault, T. R. and Cook, B. I. and Betancourt, J. L. and Schwartz, M. D.}, title={Influences of the El Niño Southern Oscillation and the Pacific Decadal Oscillation on the timing of the North American spring}, year={2012}, journal={International Journal of Climatology}, volume={32}, pages={2301--2310}, doi={10.1002/joc.3400}, }
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RIS Citation
TY - JOUR ID - mc07000g AU - McCabe, G. J. AU - Ault, T. R. AU - Cook, B. I. AU - Betancourt, J. L. AU - Schwartz, M. D. PY - 2012 TI - Influences of the El Niño Southern Oscillation and the Pacific Decadal Oscillation on the timing of the North American spring JA - Int. J. Climatol. JO - International Journal of Climatology VL - 32 SP - 2301 EP - 2310 DO - 10.1002/joc.3400 ER -
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