Impact of the Atlantic Multidecadal Oscillation on North Pacific climate variability

Details Impact of the Atlantic Multidecadal Oscillation on North Pacific climate variability Impact of the Atlantic Multidecadal Oscillation on North Pacific climate variability

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3423708z&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 23, CiteID L23708

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18

Biogeosciences: Climate Dynamics (1620), Global Change: Climate Variability (1635, 3305, 3309, 4215, 4513), Global Change: Global Climate Models (3337, 4928), Oceanography: General: Climate And Interannual Variability (1616, 1635, 3305, 3309, 4513), Atmospheric Processes: General Circulation (1223)

Scientific paper

In this paper, we found that the Atlantic Multidecadal Oscillation (AMO) can contribute to the Pacific Decadal Oscillation (PDO), especially the component of the PDO that is linearly independent of El Niño and the Southern Oscillation (ENSO), i.e. the North Pacific Multidecadal Oscillation (NPMO), and the associated Pacific/North America (PNA) pattern. Using a hybrid version of the GFDL CM2.1 climate model, we show that the AMO provides a source of multidecadal variability to the North Pacific, and needs to be considered along with other forcings for North Pacific climate change. The lagged North Pacific response to the North Atlantic forcing is through atmospheric teleconnections and reinforced by oceanic dynamics and positive air-sea feedback over the North Pacific. The results indicate that a North Pacific regime shift, opposite to the 1976-77 shift, might occur now a decade after the switch of the observed AMO to a positive phase around 1995.

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