On Connection of Northern Hemispheric Circulation to ENSO
The linkage of Northern Hemisphere (NH) circulation, best known in terms of the Pacific /North American (PNA), Tropical/Northern Hemisphere (TNH), and North Atlantic Oscillation (NAO) patterns, to El Ni~no-Southern Oscillation (ENSO) remains elusive and is still in scientific controversy. In this st...
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| Format: | Text |
| Language: | English |
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2000
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.41.8286 http://chammp.met.fsu.edu/paper/nhc-enso.ps |
| Summary: | The linkage of Northern Hemisphere (NH) circulation, best known in terms of the Pacific /North American (PNA), Tropical/Northern Hemisphere (TNH), and North Atlantic Oscillation (NAO) patterns, to El Ni~no-Southern Oscillation (ENSO) remains elusive and is still in scientific controversy. In this study, 200-mb height anomaly and tropical and North Pacific sea surface temperature anomaly (SSTA) have been analyzed using cyclostationary EOFs (CSEOFs), which accounts for the seasonal dependence of spatial patterns. Then, 200-mb height anomaly patterns have been related to the tropical and the North Pacific SSTA modes via regression analysis of the principal component (PC) time series. Results indicate a well-established connection of the PNA pattern to ENSO and also a secondary link to North Pacific SST variability. Henceforth, neither of the two sources of PNA variability can be rebuffed. Results also show seasonally-dependent and complex response of NH circulation to tropical Pacific SST. |
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