Variability of the North American Monsoon Associated with Preceding Winter’s Snowmass and Pacific SSTs. Nabeel Keblawi METO 658N Dr. Sumant Nigam Dr. Alfredo Ruiz-Barradas. Overview. Introduction (brief) Data & Methodology Climatology/Variability SWE/Monsoon/Pacific SSTs Discussion
Dr. Sumant Nigam
Dr. Alfredo Ruiz-Barradas
North & South Zones are fixed throughout JAS
The correlation between ENSO & PDO is r = 0.79
Notice the opposite correlations of US vs. Canadian Rockies
ENSO – strongest influence on snowfall all over the Rockies
In the monsoon zones: little or no correlation for July, but…
… significant positive correlations merely one month later! remarkable
Positive correlations still there…
Looking at the bars, ENSO has a stronger effect on US precipitation than the PDO.
A noticeable change from previous month; moisture associated with ENSO/PDO events surges northward well into the US…
Influence from the PDO abates somewhat in September, while that from ENSO stays to the north throughout the last month of monsoon.
Similar pattern to the SWE-monsoon correlation table; no effect in July, then the linkage becomes stronger.
Unlike US1, US2 not significantly linked with the monsoon.
C1 shows inverse relationship with monsoon except perhaps for Sept…
C2 is an interesting case: consistent inverse relationship with monsoon… opposite of US1!