How are warm and cool years in the California Current related to ENSO?

Fiedler, Paul C.; Mantua, Nathan J.

doi:10.1002/2017jc013094

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i

How are warm and cool years in the California Current related to ENSO?

2017
By Fiedler, Paul C. ; Mantua, Nathan J.
Source: Journal of Geophysical Research: Oceans, 122(7), 5936-5951

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Journal Title:

Journal of Geophysical Research: Oceans
Personal Author:

Fiedler, Paul C. ; Mantua, Nathan J.

Fiedler, Paul C. ; Mantua, Nathan J. Less -
NOAA Program & Office:

NMFS (National Marine Fisheries Service) ; SWFSC (Southwest Fisheries Science Center)

NMFS (National Marine Fisheries Service) ; SWFSC (Southwest Fisheries Science Center) Less -
Description:

The tropical El Niño‐Southern Oscillation (ENSO) is a dominant mode of interannual variability that impacts climate throughout the Pacific. The California Current System (CCS) in the northeast Pacific warms and cools from year to year, with or without a corresponding tropical El Niño or La Niña event. We update the record of warm and cool events in the CCS for 1950–2016 and use composite sea level pressure (SLP) and surface wind anomalies to explore the atmospheric forcing mechanisms associated with tropical and CCS warm and cold events. CCS warm events are associated with negative SLP anomalies in the NE Pacific—a strong and southeastward displacement of the wintertime Aleutian Low, a weak North Pacific High, and a regional pattern of cyclonic wind anomalies that are poleward over the CCS. We use a first‐order autoregressive model to show that regional North Pacific forcing is predominant in SST variations throughout most of the CCS, while remote tropical forcing is more important in the far southern portion of the CCS. In our analysis, cool events in the CCS tend to be more closely associated with tropical La Niña than are warm events in the CCS with tropical El Niño; the forcing of co‐occurring cool events is analogous, but nearly opposite, to that of warm events.
Keywords:

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Earth And Planetary Sciences (miscellaneous) Geochemistry And Petrology Geophysics Oceanography Space And Planetary Science
Source:

Journal of Geophysical Research: Oceans, 122(7), 5936-5951
DOI:

https://doi.org/10.1002/2017jc013094
ISSN:

2169-9275;2169-9291;
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PDF
Publisher:

American Geophysical Union (AGU)
Document Type:

Journal Article
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urn:sha-512:7a6c75edda55ff9502115a214938e5ae0e23f386a5af6dc9b637b013bf4c9bda9dc1b628c57f68d66181fb7ffd9aae97489eee1760b1fa7aaca3a721df7562c2
Download URL:

https://repository.library.noaa.gov/view/noaa/62391/noaa_62391_DS1.pdf
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