Modulation effect of PDO in low-frequency atmospheric variability through synoptic eddy feedback
Abstract
According to Pacific decadal oscillation (PDO) phase, sea surface temperature (SST) anomalies considerably vary over the North Pacific region in interannual and interdecadal time scale. Recent studies identified that the SST condition, especially its meridional structure, can influence the synoptic atmospheric variability by altering heat and moisture fluxes. We examined synoptic eddy activity during PDO years and found significant variation in storm track. During negative PDO winter, storm track tends to shift northward and vice versa. In midlatitude, synoptic eddy feedback process is important for the growth and persistence of low-frequency (>10 days) atmospheric variability. This study examines the difference in low-frequency variability according to the PDO phase caused by the difference in synoptic eddy feedback process and suggests possible implications from interannual and interdecadal perspectives.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2013
- Bibcode:
- 2013AGUFM.A43C0278S
- Keywords:
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- 3339 ATMOSPHERIC PROCESSES Ocean/atmosphere interactions;
- 3305 ATMOSPHERIC PROCESSES Climate change and variability