Question for @CoastalWx @ORH_wxman @40/70 Benchmark or really anyone who is much more knowledgeable than I am in this respect.
I am doing some work with the PDO and ENSO phase. In assessing positive (warm) phase versus negative (cool) phase I am using this guideline from Stepen Hare and Nathan Mantua:
Now we know that the PDO tends to be in the warm phase during EL Nino episodes and the cool phase during La Nina episodes, however, that is not always the case.
Below are ASON SST's during EL Nino events. Utilizing the graphic from above, I am focusing on SSTA patterns within the equatorial Pacific, west coasts of the United States, Canada, and Alaska, and the northern Pacific.
I am cross referencing with the raw numbers from this site https://www.ncei.noaa.gov/access/monitoring/pdo/
One thing I'm noticing is I think the very warm waters associated with EL Nino across the equatorial Pacific are heavily skewing the raw PDO data.
For example, here is 1913 PDO data for ASON (clearly the numbers are positive)
However, the SST configuration is not very reflective of a +PDO pattern
So I guess two questions are:
1. When assessing PDO state what metrics should be considered to balance out how ENSO may skew the PDO (SSTs within the equatorial PAC)?
2. If the SSTA configuration say from the west coast of the U.S. north across Alaska and north Pacific are more reflective of a negative (cool) phase but you have the warm SST's within the equatorial PAC due to EL Nino, what's the distinguisher to classify PDO state?