NDLI: A dual-period response of the Kuroshio Extension SST to Aleutian Low activity in the winter season

Content Provider	Springer Nature Link
Author	Yu, Peilong Zhang, Lifeng Liu, Hu Liu, Xing Zhu, Juan
Copyright Year	2017
Abstract	Based on our previous work, the winter sea surface temperature (SST) in the Kuroshio Extension (KE) region showed significant variability over the past century with periods of ~6 a between 1930 and 1950 and ~10 a between 1980 and 2009. How the activity of the Aleutian Low (AL) induces this dual-period variability over the two different timespans is further investigated here. For the ~6 a periodicity during 1930–1950, negative wind stress curl (WSC) anomalies in the central subtropical Pacific associated with an intensified AL generate positive sea surface height (SSH) anomalies. When these wind-induced SSH anomalies propagate westwards to the east of Taiwan, China two years later, positive velocity anomalies appear around the Kuroshio to the east of Taiwan and then the mean advection via this current of velocity anomalies leads to a strengthened KE jet and thus an increase in the KE SST one year later. For the ~10 a periodicity during 1980–2009, a negative North Pacific Oscillation-like dipole takes 2–3 a to develop into a significant positive North Pacific Oscillation-like dipole, and this process corresponds to the northward shift of the AL. Negative WSC anomalies associated with this AL activity in the central North Pacific are able to induce the positive SSH anomalies. These oceanic signals then propagate westward into the KE region after 2–3 a, favoring a northward shift of the KE jet, thus leading to the warming of the KE SST. The feedbacks of the KE SST anomaly on the AL forcing are both negative for these two periodicities. These results suggest that the dual-period KE SST variability can be generated by the two-way KE-SST-AL coupling.
Starting Page	1
Ending Page	9
Page Count	9
File Format	PDF
ISSN	0253505X
Journal	Acta Oceanologica Sinica
Volume Number	36
Issue Number	9
e-ISSN	18691099
Language	English
Publisher	The Chinese Society of Oceanography
Publisher Date	2017-09-02
Publisher Place	Beijing
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	sea surface temperature Kuroshio Extension Aleutian Low activity dual-period variability Oceanography Climatology Ecology Engineering Fluid Dynamics Marine & Freshwater Sciences Environmental Chemistry
Content Type	Text
Resource Type	Article
Subject	Aquatic Science Oceanography

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Interdecadal change of winter SST variability in the Kuroshio Extension region and its linkage with Aleutian atmospheric low pressure system

Position variability of the Kuroshio Extension sea surface temperature front

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