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Anderson BT, Hassanzadeh P, Caballero R. Persistent anomalies of the extratropical Northern Hemisphere wintertime circulation as an initiator of El Niño/Southern Oscillation events. Sci Rep. 2017;7(1):10145doi: 10.1038/s41598-017-09580-9.
Anderson, B. T., Hassanzadeh, P., & Caballero, R. (2017). Persistent anomalies of the extratropical Northern Hemisphere wintertime circulation as an initiator of El Niño/Southern Oscillation events. Scientific reports, 7(1), 10145. https://doi.org/10.1038/s41598-017-09580-9
Anderson, Bruce T, et al. "Persistent anomalies of the extratropical Northern Hemisphere wintertime circulation as an initiator of El Niño/Southern Oscillation events." Scientific reports vol. 7,1 (2017): 10145. doi: https://doi.org/10.1038/s41598-017-09580-9
Anderson BT, Hassanzadeh P, Caballero R. Persistent anomalies of the extratropical Northern Hemisphere wintertime circulation as an initiator of El Niño/Southern Oscillation events. Sci Rep. 2017 Aug 31;7(1):10145. doi: 10.1038/s41598-017-09580-9. PMID: 28860518; PMCID: PMC5578981.
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Sci Rep. 2017 Aug 31;7(1):10145. doi: 10.1038/s41598-017-09580-9.

Persistent anomalies of the extratropical Northern Hemisphere wintertime circulation as an initiator of El Niño/Southern Oscillation events.

Scientific reports

Bruce T Anderson, Pedram Hassanzadeh, Rodrigo Caballero

Affiliations

  1. Department of Earth and Environment, Boston University, 685 Commonwealth Ave., Boston, MA, 02215, USA. [email protected].
  2. Departments of Mechanical Engineering and Earth Science, Rice University, 6100 Main St., Houston, TX, 77005, USA.
  3. Department of Meteorology and Bolin Center for Climate Research, Stockholm University, 106 91, Stockholm, Sweden.

PMID: 28860518 PMCID: PMC5578981 DOI: 10.1038/s41598-017-09580-9

Abstract

Climates across both hemispheres are strongly influenced by tropical Pacific variability associated with the El Niño/Southern Oscillation (ENSO). Conversely, extratropical variability also can affect the tropics. In particular, seasonal-mean alterations of near-surface winds associated with the North Pacific Oscillation (NPO) serve as a significant extratropical forcing agent of ENSO. However, it is still unclear what dynamical processes give rise to year-to-year shifts in these long-lived NPO anomalies. Here we show that intraseasonal variability in boreal winter pressure patterns over the Central North Pacific (CNP) imparts a significant signature upon the seasonal-mean circulations characteristic of the NPO. Further we show that the seasonal-mean signature results in part from year-to-year variations in persistent, quasi-stationary low-pressure intrusions into the subtropics of the CNP, accompanied by the establishment of persistent, quasi-stationary high-pressure anomalies over high latitudes of the CNP. Overall, we find that the frequency of these persistent extratropical anomalies (PEAs) during a given winter serves as a key modulator of intraseasonal variability in extratropical North Pacific circulations and, through their influence on the seasonal-mean circulations in and around the southern lobe of the NPO, the state of the equatorial Pacific 9-12 months later.

References

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  3. Science. 1983 Dec 16;222(4629):1195-202 - PubMed

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