Decadal Variability of Winter Warm Arctic‐Cold Eurasia Dipole Patterns Modulated by Pacific Decadal Oscillation and Atlantic Multidecadal Oscillation
Abstract In recent decades, the winter surface air temperature (SAT) anomaly in the Northern Hemisphere has exhibited a warm Arctic‐cold Eurasia (WACE) dipole pattern and this has undergone significant decadal variation. In this paper, the physical cause of the decadal variability of the WACE patter...
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Wiley
2022-01-01
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Series: | Earth's Future |
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Online Access: | https://doi.org/10.1029/2021EF002351 |
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author | Binhe Luo Dehai Luo Aiguo Dai Ian Simmonds Lixin Wu |
author_facet | Binhe Luo Dehai Luo Aiguo Dai Ian Simmonds Lixin Wu |
author_sort | Binhe Luo |
collection | DOAJ |
description | Abstract In recent decades, the winter surface air temperature (SAT) anomaly in the Northern Hemisphere has exhibited a warm Arctic‐cold Eurasia (WACE) dipole pattern and this has undergone significant decadal variation. In this paper, the physical cause of the decadal variability of the WACE pattern is explored, and it is shown to be mediated by the phases of the Pacific Decadal Oscillation (PDO) and Atlantic Multidecadal Oscillation (AMO). Although the negative PDO (PDO−) or positive AMO (AMO+) favors the WACE pattern, the meridional structure of the pattern is significantly influenced by whether PDO− or AMO+ dominates. During PDO− (AMO+) phase, the winter‐mean WACE pattern shows an asymmetric dipole with weak (strong) warm anomaly over the Barents‐Kara Seas or BKS and strong (weak) cold anomaly over central Eurasia or Siberia, which corresponds to Ural blocking (UB) concurring with the negative (positive) phase of North Atlantic Oscillation in a winter‐mean field. The winter asymmetric WACE pattern is more strongly related to PDO− than AMO+. It is further found that an asymmetric sub‐seasonal WACE dipole pattern with strong (weak) warm anomaly over BKS and weak (strong) cold anomaly over Siberia is usually formed during the UB episode due to favored (suppressed) sub‐seasonal downward infrared radiation and turbulent heat flux over BKS during AMO+ (PDO−), which leads to a strong asymmetric dipole of the winter WACE pattern. |
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issn | 2328-4277 |
language | English |
last_indexed | 2024-04-14T06:14:54Z |
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series | Earth's Future |
spelling | doaj.art-610de1f4570b4b0e88bd3365478061202022-12-22T02:08:13ZengWileyEarth's Future2328-42772022-01-01101n/an/a10.1029/2021EF002351Decadal Variability of Winter Warm Arctic‐Cold Eurasia Dipole Patterns Modulated by Pacific Decadal Oscillation and Atlantic Multidecadal OscillationBinhe Luo0Dehai Luo1Aiguo Dai2Ian Simmonds3Lixin Wu4Key Laboratory of Physical Oceanography/Institute for Advanced Ocean Studies Ocean University of China and Qingdao National Laboratory for Marine Science and Technology Qingdao ChinaKey Laboratory of Regional Climate‐Environment for Temperate East Asia Institute of Atmospheric Physics Chinese Academy of Sciences University of Chinese Academy of Sciences Beijing ChinaDepartment of Atmospheric and Environmental Sciences University at Albany Albany NY USASchool of Geography Earth and Atmospheric Sciences University of Melbourne Melbourne VIC AustraliaKey Laboratory of Physical Oceanography/Institute for Advanced Ocean Studies Ocean University of China and Qingdao National Laboratory for Marine Science and Technology Qingdao ChinaAbstract In recent decades, the winter surface air temperature (SAT) anomaly in the Northern Hemisphere has exhibited a warm Arctic‐cold Eurasia (WACE) dipole pattern and this has undergone significant decadal variation. In this paper, the physical cause of the decadal variability of the WACE pattern is explored, and it is shown to be mediated by the phases of the Pacific Decadal Oscillation (PDO) and Atlantic Multidecadal Oscillation (AMO). Although the negative PDO (PDO−) or positive AMO (AMO+) favors the WACE pattern, the meridional structure of the pattern is significantly influenced by whether PDO− or AMO+ dominates. During PDO− (AMO+) phase, the winter‐mean WACE pattern shows an asymmetric dipole with weak (strong) warm anomaly over the Barents‐Kara Seas or BKS and strong (weak) cold anomaly over central Eurasia or Siberia, which corresponds to Ural blocking (UB) concurring with the negative (positive) phase of North Atlantic Oscillation in a winter‐mean field. The winter asymmetric WACE pattern is more strongly related to PDO− than AMO+. It is further found that an asymmetric sub‐seasonal WACE dipole pattern with strong (weak) warm anomaly over BKS and weak (strong) cold anomaly over Siberia is usually formed during the UB episode due to favored (suppressed) sub‐seasonal downward infrared radiation and turbulent heat flux over BKS during AMO+ (PDO−), which leads to a strong asymmetric dipole of the winter WACE pattern.https://doi.org/10.1029/2021EF002351Ural BlockingWarm Arctic‐cold Eurasia (WACE)Pacific Decadal Oscillation (PDO) and Atlantic Multidecadal Oscillation (AMO) |
spellingShingle | Binhe Luo Dehai Luo Aiguo Dai Ian Simmonds Lixin Wu Decadal Variability of Winter Warm Arctic‐Cold Eurasia Dipole Patterns Modulated by Pacific Decadal Oscillation and Atlantic Multidecadal Oscillation Earth's Future Ural Blocking Warm Arctic‐cold Eurasia (WACE) Pacific Decadal Oscillation (PDO) and Atlantic Multidecadal Oscillation (AMO) |
title | Decadal Variability of Winter Warm Arctic‐Cold Eurasia Dipole Patterns Modulated by Pacific Decadal Oscillation and Atlantic Multidecadal Oscillation |
title_full | Decadal Variability of Winter Warm Arctic‐Cold Eurasia Dipole Patterns Modulated by Pacific Decadal Oscillation and Atlantic Multidecadal Oscillation |
title_fullStr | Decadal Variability of Winter Warm Arctic‐Cold Eurasia Dipole Patterns Modulated by Pacific Decadal Oscillation and Atlantic Multidecadal Oscillation |
title_full_unstemmed | Decadal Variability of Winter Warm Arctic‐Cold Eurasia Dipole Patterns Modulated by Pacific Decadal Oscillation and Atlantic Multidecadal Oscillation |
title_short | Decadal Variability of Winter Warm Arctic‐Cold Eurasia Dipole Patterns Modulated by Pacific Decadal Oscillation and Atlantic Multidecadal Oscillation |
title_sort | decadal variability of winter warm arctic cold eurasia dipole patterns modulated by pacific decadal oscillation and atlantic multidecadal oscillation |
topic | Ural Blocking Warm Arctic‐cold Eurasia (WACE) Pacific Decadal Oscillation (PDO) and Atlantic Multidecadal Oscillation (AMO) |
url | https://doi.org/10.1029/2021EF002351 |
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