Dependence of the structure of the Northern Hemisphere annular mode on the polarity of ENSO

Details Dependence of the structure of the Northern Hemisphere annular mode on the polarity of ENSO Dependence of the structure of the Northern Hemisphere annular mode on the polarity of ENSO

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29w..47q&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 23, pp. 47-1, CiteID 2132, DOI 10.1029/2002GL015807

Physics

26

Global Change: Climate Dynamics (3309), Global Change: Atmosphere (0315, 0325), Meteorology And Atmospheric Dynamics: Climatology (1620)

Scientific paper

The structure of the Northern Hemisphere annular mode (NAM) is shown to be significantly different during warm and cold winters of the ENSO cycle. During warm winters the Arctic center of action of the annular mode is more prominent and extends deeper into Siberia, its related surface air temperature signal is stronger, and the compensating outer ring in the sea-level pressure field is much broader, encompassing the entire tropics. During cold winters the NAM signature is much more pronounced over the Pacific sector: the sea-level pressure pattern exhibits a North Pacific center of action, positively correlated with the Atlantic center, and pronounced deflections of the storm track are also evident. It is suggested that the former features are associated with the equatorward displacement of the jet stream and the storm tracks during warm winters of the ENSO cycle and the latter is related to the the more pronounced break in the subtropical jet stream over the Pacific sector during cold winters.

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