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    Effect of the Late-1990s Change in Tropical Forcing on Teleconnections to the Amundsen–Bellingshausen Seas Region during Austral Autumn

    Source: Journal of Climate:;2022:;volume( 035 ):;issue: 017::page 5687
    Author:
    Yuanyuan Guo
    ,
    Zhiping Wen
    ,
    Yu Zhu
    ,
    Xiaodan Chen
    DOI: 10.1175/JCLI-D-21-0965.1
    Publisher: American Meteorological Society
    Abstract: Tropical sea surface temperature (SST) and associated precipitation, acting as diabatic heat forcing, has far-reaching climatic impacts across the globe through exciting poleward-propagating Rossby waves. It is found that the leading mode of tropical Pacific forcing in austral autumn experiences a significant interdecadal shift from an eastern Pacific (EP) to a central Pacific (CP) type around the late 1990s. More specifically, the EP-type precipitation anomaly mode before 1998 drives a quadrupole-like teleconnection pathway emanating from the tropical Pacific to the Ross Sea and Amundsen–Bellingshausen Seas (ABS) region, whereas the CP-type mode after 1999 excites a Pacific–South American (PSA)-like teleconnection orienting along a great circle. Divergent flows induced by different precipitation anomaly modes primarily determine the generation of Rossby waves by means of the vortex stretching and vorticity advection processes. Furthermore, the synoptic high-frequency transient eddy activity along with its dynamic forcing effect differs greatly before and after 1998/99, contributing to different locations of the teleconnection lobes at mid- to high latitudes. In contrast, the subseasonal low-frequency transient eddy activity exerts a limited influence. Our findings also indicate that the EP-type (CP-type) tropical forcing mode could significantly modulate the zonal displacement (strength) of the Amundsen Sea low, which could lead to distinct climate responses of West Antarctica and the Antarctic Peninsula in austral autumn.
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      Effect of the Late-1990s Change in Tropical Forcing on Teleconnections to the Amundsen–Bellingshausen Seas Region during Austral Autumn

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    contributor authorYuanyuan Guo
    contributor authorZhiping Wen
    contributor authorYu Zhu
    contributor authorXiaodan Chen
    date accessioned2023-04-12T18:45:27Z
    date available2023-04-12T18:45:27Z
    date copyright2022/09/01
    date issued2022
    identifier otherJCLI-D-21-0965.1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4290193
    description abstractTropical sea surface temperature (SST) and associated precipitation, acting as diabatic heat forcing, has far-reaching climatic impacts across the globe through exciting poleward-propagating Rossby waves. It is found that the leading mode of tropical Pacific forcing in austral autumn experiences a significant interdecadal shift from an eastern Pacific (EP) to a central Pacific (CP) type around the late 1990s. More specifically, the EP-type precipitation anomaly mode before 1998 drives a quadrupole-like teleconnection pathway emanating from the tropical Pacific to the Ross Sea and Amundsen–Bellingshausen Seas (ABS) region, whereas the CP-type mode after 1999 excites a Pacific–South American (PSA)-like teleconnection orienting along a great circle. Divergent flows induced by different precipitation anomaly modes primarily determine the generation of Rossby waves by means of the vortex stretching and vorticity advection processes. Furthermore, the synoptic high-frequency transient eddy activity along with its dynamic forcing effect differs greatly before and after 1998/99, contributing to different locations of the teleconnection lobes at mid- to high latitudes. In contrast, the subseasonal low-frequency transient eddy activity exerts a limited influence. Our findings also indicate that the EP-type (CP-type) tropical forcing mode could significantly modulate the zonal displacement (strength) of the Amundsen Sea low, which could lead to distinct climate responses of West Antarctica and the Antarctic Peninsula in austral autumn.
    publisherAmerican Meteorological Society
    titleEffect of the Late-1990s Change in Tropical Forcing on Teleconnections to the Amundsen–Bellingshausen Seas Region during Austral Autumn
    typeJournal Paper
    journal volume35
    journal issue17
    journal titleJournal of Climate
    identifier doi10.1175/JCLI-D-21-0965.1
    journal fristpage5687
    journal lastpage5702
    page5687–5702
    treeJournal of Climate:;2022:;volume( 035 ):;issue: 017
    contenttypeFulltext
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