Revisiting the Pacific meridional mode
Numerous studies demonstrated that the Pacific Meridional Mode (PMM) can excite Central Pacific (CP) El Nino-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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Online Access: | https://doi.org/10.1038/s41598-018-21537-0 |
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ftncar:oai:drupal-site.org:articles_21358 2023-09-05T13:11:35+02:00 Revisiting the Pacific meridional mode Stuecker, Malte F. (author) 2018-02-16 https://doi.org/10.1038/s41598-018-21537-0 en eng Scientific Reports--Sci Rep--2045-2322 NCAR Command Language (NCL)--10.5065/D6WD3XH5 Cheyenne: SGI ICE XA Cluster--10.5065/D6RX99HX articles:21358 ark:/85065/d7gf0x4x doi:10.1038/s41598-018-21537-0 Copyright 2018 Author(s). Distributed under a Creative Commons Attribution 4.0 International License. article Text 2018 ftncar https://doi.org/10.1038/s41598-018-21537-0 2023-08-14T18:48:05Z Numerous studies demonstrated that the Pacific Meridional Mode (PMM) can excite Central Pacific (CP) El Nino-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 partiallycoupled 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. Article in Journal/Newspaper aleutian low OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Pacific Scientific Reports 8 1 |
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OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
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ftncar |
language |
English |
description |
Numerous studies demonstrated that the Pacific Meridional Mode (PMM) can excite Central Pacific (CP) El Nino-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 partiallycoupled 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. |
author2 |
Stuecker, Malte F. (author) |
format |
Article in Journal/Newspaper |
title |
Revisiting the Pacific meridional mode |
spellingShingle |
Revisiting the Pacific meridional mode |
title_short |
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_sort |
revisiting the pacific meridional mode |
publishDate |
2018 |
url |
https://doi.org/10.1038/s41598-018-21537-0 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
aleutian low |
genre_facet |
aleutian low |
op_relation |
Scientific Reports--Sci Rep--2045-2322 NCAR Command Language (NCL)--10.5065/D6WD3XH5 Cheyenne: SGI ICE XA Cluster--10.5065/D6RX99HX articles:21358 ark:/85065/d7gf0x4x doi:10.1038/s41598-018-21537-0 |
op_rights |
Copyright 2018 Author(s). Distributed under a Creative Commons Attribution 4.0 International License. |
op_doi |
https://doi.org/10.1038/s41598-018-21537-0 |
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Scientific Reports |
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8 |
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1 |
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1776205288221704192 |