skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Dynamical Links between the Decadal Variability of the Oyashio and Kuroshio Extensions

Abstract

Rather than a single and continuous boundary current outflow, long-term satellite observations reveal that the Oyashio Extension (OE) in the North Pacific Subarctic Gyre comprises two independent, northeast–southwest-slanted front systems. With a mean latitude along 40°N, the western OE front exists primarily west of 153°E and is a continuation of the subarctic gyre western boundary current. The eastern OE front, also appearing along 40°N, is located between 153° and 170°E, whose entity is disconnected from its western counterpart. During 1982–2016, both of the OE fronts exhibit prominent decadal fluctuations, although their signals show little contemporaneous correlation. An upper-ocean temperature budget analysis based on the Estimating the Circulation and Climate of the Ocean, phase II (ECCO2), state estimate reveals that the advective temperature flux convergence plays a critical role in determining the low-frequency temperature changes relating to the OE fronts. Specifically, the western OE front variability is controlled by the decadal mesoscale eddy modulations in the upstream Kuroshio Extension (KE). An enhanced eddy activity increases the poleward heat transport and works to strengthen the western OE front. The eastern OE front variability, on the other hand, is dictated by both the meridional shift of the KE position and the circulation intensitymore » change immediately north of the eastern OE. Different baroclinic adjustment speeds for the KE and OE are found to cause the in-phase changes between these latter two processes. Lack of contemporaneous correlation between the decadal western and eastern OE variability is found to be related to the interaction of the meridionally migrating KE jet with the Shatsky Rise near 159°E.« less

Authors:
 [1];  [1];  [1]
  1. Department of Oceanography, University of Hawai‘i at Mānoa, Honolulu, Hawaii
Publication Date:
Research Org.:
Univ. of Hawaii, Honolulu, HI (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1407454
Alternate Identifier(s):
OSTI ID: 1541842
Grant/Contract Number:  
SC0005111; SC006766
Resource Type:
Journal Article: Published Article
Journal Name:
Journal of Climate
Additional Journal Information:
Journal Name: Journal of Climate Journal Volume: 30 Journal Issue: 23; Journal ID: ISSN 0894-8755
Publisher:
American Meteorological Society
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; Meteorology & Atmospheric Sciences

Citation Formats

Qiu, Bo, Chen, Shuiming, and Schneider, Niklas. Dynamical Links between the Decadal Variability of the Oyashio and Kuroshio Extensions. United States: N. p., 2017. Web. doi:10.1175/JCLI-D-17-0397.1.
Qiu, Bo, Chen, Shuiming, & Schneider, Niklas. Dynamical Links between the Decadal Variability of the Oyashio and Kuroshio Extensions. United States. doi:10.1175/JCLI-D-17-0397.1.
Qiu, Bo, Chen, Shuiming, and Schneider, Niklas. Fri . "Dynamical Links between the Decadal Variability of the Oyashio and Kuroshio Extensions". United States. doi:10.1175/JCLI-D-17-0397.1.
@article{osti_1407454,
title = {Dynamical Links between the Decadal Variability of the Oyashio and Kuroshio Extensions},
author = {Qiu, Bo and Chen, Shuiming and Schneider, Niklas},
abstractNote = {Rather than a single and continuous boundary current outflow, long-term satellite observations reveal that the Oyashio Extension (OE) in the North Pacific Subarctic Gyre comprises two independent, northeast–southwest-slanted front systems. With a mean latitude along 40°N, the western OE front exists primarily west of 153°E and is a continuation of the subarctic gyre western boundary current. The eastern OE front, also appearing along 40°N, is located between 153° and 170°E, whose entity is disconnected from its western counterpart. During 1982–2016, both of the OE fronts exhibit prominent decadal fluctuations, although their signals show little contemporaneous correlation. An upper-ocean temperature budget analysis based on the Estimating the Circulation and Climate of the Ocean, phase II (ECCO2), state estimate reveals that the advective temperature flux convergence plays a critical role in determining the low-frequency temperature changes relating to the OE fronts. Specifically, the western OE front variability is controlled by the decadal mesoscale eddy modulations in the upstream Kuroshio Extension (KE). An enhanced eddy activity increases the poleward heat transport and works to strengthen the western OE front. The eastern OE front variability, on the other hand, is dictated by both the meridional shift of the KE position and the circulation intensity change immediately north of the eastern OE. Different baroclinic adjustment speeds for the KE and OE are found to cause the in-phase changes between these latter two processes. Lack of contemporaneous correlation between the decadal western and eastern OE variability is found to be related to the interaction of the meridionally migrating KE jet with the Shatsky Rise near 159°E.},
doi = {10.1175/JCLI-D-17-0397.1},
journal = {Journal of Climate},
issn = {0894-8755},
number = 23,
volume = 30,
place = {United States},
year = {2017},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1175/JCLI-D-17-0397.1

Citation Metrics:
Cited by: 12 works
Citation information provided by
Web of Science

Save / Share:

Works referencing / citing this record:

Mesoscale SST perturbation-induced impacts on climatological precipitation in the Kuroshio-Oyashio extension region, as revealed by the WRF simulations
journal, September 2018

  • Gao, Jiaxiang; Zhang, Rong-Hua; Wang, Hongna
  • Journal of Oceanology and Limnology, Vol. 37, Issue 2
  • DOI: 10.1007/s00343-019-8065-5

Identification of the fronts from the Kuroshio Extension to the Subarctic Current using absolute dynamic topographies in satellite altimetry products
journal, March 2018

  • Nakano, Hideyuki; Tsujino, Hiroyuki; Sakamoto, Kei
  • Journal of Oceanography, Vol. 74, Issue 4
  • DOI: 10.1007/s10872-018-0470-4

Mesoscale SST perturbation-induced impacts on climatological precipitation in the Kuroshio-Oyashio extension region, as revealed by the WRF simulations
journal, September 2018

  • Gao, Jiaxiang; Zhang, Rong-Hua; Wang, Hongna
  • Journal of Oceanology and Limnology, Vol. 37, Issue 2
  • DOI: 10.1007/s00343-019-8065-5

Identification of the fronts from the Kuroshio Extension to the Subarctic Current using absolute dynamic topographies in satellite altimetry products
journal, March 2018

  • Nakano, Hideyuki; Tsujino, Hiroyuki; Sakamoto, Kei
  • Journal of Oceanography, Vol. 74, Issue 4
  • DOI: 10.1007/s10872-018-0470-4