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Title: Enhanced interactions of Kuroshio Extension with tropical Pacific in a changing climate

Abstract

Quasi-decadal climate of the Kuroshio Extension (KE) is pivotal to understanding the North Pacific coupled ocean–atmosphere dynamics and their predictability. Recent observational studies suggest that extratropical-tropical coupling between the KE and the central tropical Pacific El Niño Southern Oscillation (CP-ENSO) leads to the observed preferred decadal time-scale of Pacific climate variability. By combining reanalysis data with numerical simulations from a high-resolution climate model and a linear inverse model (LIM), we confirm that KE and CP-ENSO dynamics are linked through extratropical-tropical teleconnections. Specifically, the atmospheric response to the KE excites Meridional Modes that energize the CP-ENSO (extratropicstropics), and in turn, CP-ENSO teleconnections energize the extratropical atmospheric forcing of the KE (tropicsextratropics). However, both observations and the model show that the KE/CP-ENSO coupling is non-stationary and has intensified in recent decades after the mid-1980. Given the short length of the observational and climate model record, it is difficult to attribute this shift to anthropogenic forcing. However, using a large-ensemble of the LIM we show that the intensification in the KE/CP-ENSO coupling after the mid-1980 is significant and linked to changes in the KE atmospheric downstream response, which exhibit a stronger imprint on the subtropical winds that excite the Pacific Meridional modes andmore » CP-ENSO.« less

Authors:
 [1];  [2];  [3];  [4]
+ Show Author Affiliations
  1. Georgia Inst. of Technology, Atlanta, GA (United States). School of Earth and Atomospheric Sciences; Princeton Univ., NJ (United States). Atmospheric and Oceanic Sciences
  2. Georgia Inst. of Technology, Atlanta, GA (United States). School of Earth and Atomospheric Sciences
  3. Univ. of Miami, Miami, FL (United States). Rosenstiel School of Marine and Atmospheric Science
  4. Univ. of Miami, Miami, FL (United States). Rosenstiel School of Marine and Atmospheric Science; Univ. of Miami, Miami, FL (United States). Cooperative Inst. for Marine and Atmospheric Studies
Publication Date:
Research Org.:
Georgia Inst. of Technology, Atlanta, GA (United States). Georgia Tech Research Institute; Univ. of Miami, FL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1816447
Grant/Contract Number:  
SC0019418; SC0019433
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 11; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Joh, Youngji, Di Lorenzo, Emanuele, Siqueira, Leo, and Kirtman, Benjamin P. Enhanced interactions of Kuroshio Extension with tropical Pacific in a changing climate. United States: N. p., 2021. Web. doi:10.1038/s41598-021-85582-y.
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Joh, Youngji, Di Lorenzo, Emanuele, Siqueira, Leo, & Kirtman, Benjamin P. Enhanced interactions of Kuroshio Extension with tropical Pacific in a changing climate. United States. https://doi.org/10.1038/s41598-021-85582-y
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Joh, Youngji, Di Lorenzo, Emanuele, Siqueira, Leo, and Kirtman, Benjamin P. Thu . "Enhanced interactions of Kuroshio Extension with tropical Pacific in a changing climate". United States. https://doi.org/10.1038/s41598-021-85582-y. https://www.osti.gov/servlets/purl/1816447.
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@article{osti_1816447,
title = {Enhanced interactions of Kuroshio Extension with tropical Pacific in a changing climate},
author = {Joh, Youngji and Di Lorenzo, Emanuele and Siqueira, Leo and Kirtman, Benjamin P.},
abstractNote = {Quasi-decadal climate of the Kuroshio Extension (KE) is pivotal to understanding the North Pacific coupled ocean–atmosphere dynamics and their predictability. Recent observational studies suggest that extratropical-tropical coupling between the KE and the central tropical Pacific El Niño Southern Oscillation (CP-ENSO) leads to the observed preferred decadal time-scale of Pacific climate variability. By combining reanalysis data with numerical simulations from a high-resolution climate model and a linear inverse model (LIM), we confirm that KE and CP-ENSO dynamics are linked through extratropical-tropical teleconnections. Specifically, the atmospheric response to the KE excites Meridional Modes that energize the CP-ENSO (extratropicstropics), and in turn, CP-ENSO teleconnections energize the extratropical atmospheric forcing of the KE (tropicsextratropics). However, both observations and the model show that the KE/CP-ENSO coupling is non-stationary and has intensified in recent decades after the mid-1980. Given the short length of the observational and climate model record, it is difficult to attribute this shift to anthropogenic forcing. However, using a large-ensemble of the LIM we show that the intensification in the KE/CP-ENSO coupling after the mid-1980 is significant and linked to changes in the KE atmospheric downstream response, which exhibit a stronger imprint on the subtropical winds that excite the Pacific Meridional modes and CP-ENSO.},
doi = {10.1038/s41598-021-85582-y},
journal = {Scientific Reports},
number = 1,
volume = 11,
place = {United States},
year = {Thu Mar 18 00:00:00 EDT 2021},
month = {Thu Mar 18 00:00:00 EDT 2021}
}
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