Impact of the North Pacific Meridional Mode on the Tropical Pacific Modulated by the Interdecadal Pacific Oscillation

The North Pacific meridional mode (NPMM) peaking in boreal spring influences El Nino-Southern Oscillation (ENSO) properties in the ensuing winter. Whether the precursory impact of NPMM on the spatial diversity of ENSO has decadal variation remains unknown. Using long-term reanalysis datasets, we fin...

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Bibliographic Details
Published in:Journal of Climate
Main Authors: Liu, Bowen, Gan, Bolan, Jia, Fan, Wu, Lixin
Format: Report
Language:English
Published: AMER METEOROLOGICAL SOC 2024
Subjects:
Pacific Ocean
Air-sea interaction
ENSO
Interdecadal variability
Meteorology & Atmospheric Sciences
NINO-SOUTHERN OSCILLATION
LAYER HEAT-BALANCE
EL-NINO
EASTERN-PACIFIC
ASYMMETRIC MODULATION
SURFACE-TEMPERATURE
CLIMATE VARIABILITY
BOOTSTRAP METHODS
OCEAN
Pacific
aleutian low
Online Access:http://ir.qdio.ac.cn/handle/337002/184834
http://ir.qdio.ac.cn/handle/337002/184835
https://doi.org/10.1175/JCLI-D-23-0448.1
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Summary:The North Pacific meridional mode (NPMM) peaking in boreal spring influences El Nino-Southern Oscillation (ENSO) properties in the ensuing winter. Whether the precursory impact of NPMM on the spatial diversity of ENSO has decadal variation remains unknown. Using long-term reanalysis datasets, we find that the interdecadal Pacific oscillation (IPO) significantly modulates the NPMM forcing on two types of ENSO. During the positive IPO (1IPO) phase, a strengthened background Aleutian low and southward -shifted storm track, in comparison to the negative IPO (-IPO) phase, produce stronger basin -scale negative geopotential height tendency anomalies over the North Pacific through synopticscale eddy-mean flow interaction. Such strong background negative tendency facilitates an Aleutian low-like pressure monopole rather than a North Pacific Oscillation (NPO)-like pressure dipole in boreal spring, leading to a weak NPMM that cannot effectively promote development of either a central Pacific (CP) or an eastern Pacific (EP) ENSO. By contrast, the NPO-like dipole enhances in boreal spring during -IPO, corresponding to stronger and more frequently occurring NPMM events that induce a robust CP-ENSO-like response in boreal winter. Moreover, the -IPO-related tropical Pacific mean states and the associated positive feedbacks cause a strong decrease in mixed layer temperature variance in the equatorial eastern Pacific, but a slight increase in the central Pacific, thus further contributing to the enhanced correlation between NPMM and CP-ENSO. Therefore, -IPO has played a role in the stronger impact of NPMM on CP-ENSO since the 1990s, and the modulation effects of IPO should be considered in understanding the extratropical-tropical climatic connection and ENSO spatial diversity.

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