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

• 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

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.