A Regional Index of Northeast Pacific Variability Based on Satellite Altimeter Data

Authors

Patrick F. Cummins, Institute of Ocean Sciences
Gary S. Lagerloef, Institute of Ocean Sciences
Gary Mitchum, Institute of Ocean SciencesFollow

Document Type

Article

Publication Date

2005

Digital Object Identifier (DOI)

https://doi.org/10.1029/2005GL023642

Abstract

An index of climate variability to monitor the state of the upper ocean is proposed for the northeast (NE) Pacific Ocean based on sea surface height (SSH) data from satellite altimetry. While sea surface temperature (SST) is often used characterize ocean variability, SSH reflects the integrated influence of temperature and salinity anomalies through the water column. A canonical correlation analysis shows that SSH and SST anomalies vary coherently at large spatial scales and low frequencies over the region. SSH anomalies are less subject to short period variability and the temporal components for SSH resemble smoothed, low-pass-filtered versions of the SST components. Also examined is the relationship between the SST-based Pacific Decadal Oscillation (PDO) index and the large-scale, upper ocean variability reflected in the leading principal component of SSH anomalies. The comparison demonstrates that the SSH principal component provides a robust index of regional climate variability that is less noisy than the PDO. The results are used to examine the 1998–2002 climate event over the NE Pacific.

Rights Information

Terms of use for work posted in Scholar Commons.

Was this content written or created while at USF?

Yes

Citation / Publisher Attribution

Geophysical Research Letters, v. 32, issue 17, art. L17607

©2005. American Geophysical Union. All Rights Reserved.

Scholar Commons Citation

Cummins, Patrick F.; Lagerloef, Gary S.; and Mitchum, Gary, "A Regional Index of Northeast Pacific Variability Based on Satellite Altimeter Data" (2005). Marine Science Faculty Publications. 2064.
https://digitalcommons.usf.edu/msc_facpub/2064