Meteo481-Oct14_2008 - Pacific Decadal Oscillation PDA/NPO...

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NWS-State College Pacific Decadal Oscillation PDA/NPO Oceanic Index • The  Pacific Decadal Oscillation  ( PDO ) is an index of  long-term variability of the sea-surface temperatures of  the  North Pacific Ocean.    – reflects the dominant mode of SST over the North Pacific Ocean.  – The PDO can impact the climate.  – A characteristic that distinguishes the PDO from ENSO is that 20th century  PDO events have tended to persist for  20-to-30 years , while ENSO events  have typically persisted for  6 to 18 months – also known as the  North Pacific Oscillation (NPO)  and the terms can be  used  interchangeably.  
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NWS-State College Phases of the PDO/NPO – the  high phase  of the NPO is the term used to describe a  warm  PDO  and the  low phase  of the NPO is the term used to  describe the  cold PDO . Research indicates a clear link of the PDO to the ENSO.  Some believe the sign of the PDO may drive the longer term  ENSO cycle.
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NWS-State College PDO SST Examples Figure 2 The warm phase (left) and cold phase (right) of the PDO. The warm phase is also known as
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This note was uploaded on 02/13/2009 for the course METEO 481 taught by Professor Gadomski,f during the Fall '08 term at Pennsylvania State University, University Park.

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Meteo481-Oct14_2008 - Pacific Decadal Oscillation PDA/NPO...

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