NDLI: Quasi-decadal modulations of North Pacific Intermediate Water area in the cross section along the 137°E meridian: impact of the Aleutian Low activity

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Quasi-decadal modulations of North Pacific Intermediate Water area in the cross section along the 137°E meridian: impact of the Aleutian Low activity

Content Provider	Springer Nature Link
Author	Sugimoto, Shusaku Hanawa, Kimio
Copyright Year	2011
Abstract	Temporal variations of area of the North Pacific Intermediate Water (NPIW), in the repeat hydrographic section along 137°E meridian conducted by the Japan Meteorological Agency, are investigated using the de-trended variables from 1972 to 2008. Variations of NPIW area show a clear quasi-decadal (about 10 years) modulation and it is caused by the vertical displacement of isopycnal surfaces in the lower portion of NPIW around the northern boundary of its distribution (30–32°N): The downward (upward) movement of isopycnal surfaces in the lower portion of NPIW as a result of the first-mode baroclinic ocean response stretches (shrinks) the density layer equivalent of NPIW and causes strengthening (weakening) of westward flows associated with the Kuroshio Counter Current, and then it can induce an increase (decrease) of volume transport of NPIW from the east. Consequently, the NPIW northern boundary shifts northward (southward) and an increase (decrease) of the NPIW area is induced. Large-scale atmospheric forcing controlling the vertical displacements of isopycnal surfaces is explored using a wind-driven hindcast ocean model. The vertical displacements stem from the first-mode baroclinic ocean response to the two types of Aleutian Low (AL) activities: in particular, the meridional movement of the AL imparts more potential influence on them than the AL intensity variation does.
Starting Page	519
Ending Page	531
Page Count	13
File Format	PDF
ISSN	09168370
Journal	Journal of Oceanography
Volume Number	67
Issue Number	4
e-ISSN	1573868X
Language	English
Publisher	Springer Japan
Publisher Date	2011-07-21
Publisher Place	Japan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	NPIW Decadal timescale Aleutian Low West Pacific teleconnection pattern Freshwater & Marine Ecology Oceanography
Content Type	Text
Resource Type	Article
Subject	Oceanography

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