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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AMER METEOROLOGICAL SOC
2024
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ftchinacasciocas:oai:ir.qdio.ac.cn:337002/184686 2024-06-23T07:45:14+00:00 Impact of the North Pacific Meridional Mode on the Tropical Pacific Modulated by the Interdecadal Pacific Oscillation Liu, Bowen Gan, Bolan Jia, Fan Wu, Lixin 2024-04-01 http://ir.qdio.ac.cn/handle/337002/184686 https://doi.org/10.1175/JCLI-D-23-0448.1 英语 eng AMER METEOROLOGICAL SOC JOURNAL OF CLIMATE http://ir.qdio.ac.cn/handle/337002/184686 doi:10.1175/JCLI-D-23-0448.1 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 期刊论文 2024 ftchinacasciocas https://doi.org/10.1175/JCLI-D-23-0448.1 2024-05-27T23:36:17Z 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. Report aleutian low Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR Pacific Journal of Climate 37 7 2199 2216 |
institution |
Open Polar |
collection |
Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR |
op_collection_id |
ftchinacasciocas |
language |
English |
topic |
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 |
spellingShingle |
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 Liu, Bowen Gan, Bolan Jia, Fan Wu, Lixin Impact of the North Pacific Meridional Mode on the Tropical Pacific Modulated by the Interdecadal Pacific Oscillation |
topic_facet |
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 |
description |
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. |
format |
Report |
author |
Liu, Bowen Gan, Bolan Jia, Fan Wu, Lixin |
author_facet |
Liu, Bowen Gan, Bolan Jia, Fan Wu, Lixin |
author_sort |
Liu, Bowen |
title |
Impact of the North Pacific Meridional Mode on the Tropical Pacific Modulated by the Interdecadal Pacific Oscillation |
title_short |
Impact of the North Pacific Meridional Mode on the Tropical Pacific Modulated by the Interdecadal Pacific Oscillation |
title_full |
Impact of the North Pacific Meridional Mode on the Tropical Pacific Modulated by the Interdecadal Pacific Oscillation |
title_fullStr |
Impact of the North Pacific Meridional Mode on the Tropical Pacific Modulated by the Interdecadal Pacific Oscillation |
title_full_unstemmed |
Impact of the North Pacific Meridional Mode on the Tropical Pacific Modulated by the Interdecadal Pacific Oscillation |
title_sort |
impact of the north pacific meridional mode on the tropical pacific modulated by the interdecadal pacific oscillation |
publisher |
AMER METEOROLOGICAL SOC |
publishDate |
2024 |
url |
http://ir.qdio.ac.cn/handle/337002/184686 https://doi.org/10.1175/JCLI-D-23-0448.1 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
aleutian low |
genre_facet |
aleutian low |
op_relation |
JOURNAL OF CLIMATE http://ir.qdio.ac.cn/handle/337002/184686 doi:10.1175/JCLI-D-23-0448.1 |
op_doi |
https://doi.org/10.1175/JCLI-D-23-0448.1 |
container_title |
Journal of Climate |
container_volume |
37 |
container_issue |
7 |
container_start_page |
2199 |
op_container_end_page |
2216 |
_version_ |
1802638444486197248 |