how to find a trend of slpe anomalies in r what is the north atlantic oscillation swp definition which of these is a major source of variability in sea level what is this dot product r slp anomaly what is the principal component of an slp anomaly what is the slp anomaly? how to find a principal component of an slp anomaly what is slp what kind of data is used to identify a seasonal oscillation of the north atlantic ocean? how to compute a scalar dot what is north atlantic oscillation data what data is used to compute slp anomalies? what is the scalar dot product between field and data what is the slp anomaly how to compute principal component what is principal component in r? how do you compute dot between principal and principal? how to find slp anomaly in graph