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Revisiting the Pacific Meridional Mode
Numerous studies demonstrated that the Pacific Meridional Mode (PMM) can excite Central Pacific (CP) El Niño-Southern Oscillation (ENSO) events and that the PMM is mostly a stochastic phenomenon associated with mid-latitude atmospheric variability and wind-evaporation-SST feedback. Here we show that...
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Nature Publishing Group UK
2018
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5816654/ https://www.ncbi.nlm.nih.gov/pubmed/29453338 http://dx.doi.org/10.1038/s41598-018-21537-0 |
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author | Stuecker, Malte F. |
author_facet | Stuecker, Malte F. |
author_sort | Stuecker, Malte F. |
collection | PubMed |
description | Numerous studies demonstrated that the Pacific Meridional Mode (PMM) can excite Central Pacific (CP) El Niño-Southern Oscillation (ENSO) events and that the PMM is mostly a stochastic phenomenon associated with mid-latitude atmospheric variability and wind-evaporation-SST feedback. Here we show that CP sea surface temperature (SST) variability exhibits high instantaneous correlations both on interannual (ENSO-related) and decadal (Pacific Decadal Oscillation (PDO)-related) timescales with the PMM. By prescribing an idealized interannual equatorial CP ENSO SST forcing in a partially-coupled atmosphere/slab ocean model we are able to generate a realistic instantaneous PMM response consistent with the observed statistical ENSO/PMM relationship. This means that CP ENSO and the PMM can excite each other respectively on interannual timescales, strongly suggesting that a fast positive feedback exists between the two phenomena. Thus, we argue that they cannot be considered two independent dynamical entities. Additionally, we show that the interannual CP ENSO SST forcing generates atmospheric circulation variability that projects strongly on the Aleutian Low and North Pacific SST anomalies that exhibit the characteristic PDO pattern. |
format | Online Article Text |
id | pubmed-5816654 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-58166542018-02-21 Revisiting the Pacific Meridional Mode Stuecker, Malte F. Sci Rep Article Numerous studies demonstrated that the Pacific Meridional Mode (PMM) can excite Central Pacific (CP) El Niño-Southern Oscillation (ENSO) events and that the PMM is mostly a stochastic phenomenon associated with mid-latitude atmospheric variability and wind-evaporation-SST feedback. Here we show that CP sea surface temperature (SST) variability exhibits high instantaneous correlations both on interannual (ENSO-related) and decadal (Pacific Decadal Oscillation (PDO)-related) timescales with the PMM. By prescribing an idealized interannual equatorial CP ENSO SST forcing in a partially-coupled atmosphere/slab ocean model we are able to generate a realistic instantaneous PMM response consistent with the observed statistical ENSO/PMM relationship. This means that CP ENSO and the PMM can excite each other respectively on interannual timescales, strongly suggesting that a fast positive feedback exists between the two phenomena. Thus, we argue that they cannot be considered two independent dynamical entities. Additionally, we show that the interannual CP ENSO SST forcing generates atmospheric circulation variability that projects strongly on the Aleutian Low and North Pacific SST anomalies that exhibit the characteristic PDO pattern. Nature Publishing Group UK 2018-02-16 /pmc/articles/PMC5816654/ /pubmed/29453338 http://dx.doi.org/10.1038/s41598-018-21537-0 Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Stuecker, Malte F. Revisiting the Pacific Meridional Mode |
title | Revisiting the Pacific Meridional Mode |
title_full | Revisiting the Pacific Meridional Mode |
title_fullStr | Revisiting the Pacific Meridional Mode |
title_full_unstemmed | Revisiting the Pacific Meridional Mode |
title_short | Revisiting the Pacific Meridional Mode |
title_sort | revisiting the pacific meridional mode |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5816654/ https://www.ncbi.nlm.nih.gov/pubmed/29453338 http://dx.doi.org/10.1038/s41598-018-21537-0 |
work_keys_str_mv | AT stueckermaltef revisitingthepacificmeridionalmode |