Zonal shift in the cold airmass stream of the East Asian winter monsoon
Abstract The East Asian winter monsoon (EAWM) exhibits long-term variations in intensity and spatial pattern, though the latter one is less understood. To investigate the long-term spatial variations of the EAWM and their possible causes, we propose a new position index of the EAWM by quantifying th...
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crioppubl:10.1088/1748-9326/ac36f5 2024-06-23T07:51:46+00:00 Zonal shift in the cold airmass stream of the East Asian winter monsoon Liu, Qian Chen, Guixing Guangdong Major Project National Natural Science Foundation of China 2021 http://dx.doi.org/10.1088/1748-9326/ac36f5 https://iopscience.iop.org/article/10.1088/1748-9326/ac36f5 https://iopscience.iop.org/article/10.1088/1748-9326/ac36f5/pdf unknown IOP Publishing http://creativecommons.org/licenses/by/4.0 https://iopscience.iop.org/info/page/text-and-data-mining Environmental Research Letters volume 16, issue 12, page 124028 ISSN 1748-9326 journal-article 2021 crioppubl https://doi.org/10.1088/1748-9326/ac36f5 2024-06-10T04:11:09Z Abstract The East Asian winter monsoon (EAWM) exhibits long-term variations in intensity and spatial pattern, though the latter one is less understood. To investigate the long-term spatial variations of the EAWM and their possible causes, we propose a new position index of the EAWM by quantifying the low-level East Asian stream (EAS) of cold airmass in the Lagrangian sense. Based on the new-defined index, we find that the EAS undergoes an evident zonal shift between two channels over the land and coast. At interdecadal timescale, the peak location of the EAS is displaced eastward, with an increasing southward cold airmass flux at the coast since the mid-1960s. The interannual shift of the EAS presents not only the zonal oscillation of peak location between two channels but also the width changes of coastal channel over the northwestern Pacific. These shifts in the EAS are related to the strength changes of two source cold airmass streams from Siberia or Bering Sea, which are associated with the phase changes in the upper-tropospheric atmospheric teleconnections. At interdecadal timescale, the phase change in the North Atlantic Oscillation modulates the zonal shift in the EAS via the East Atlantic-West Russia teleconnection. At interannual timescale, the Pacific/North American teleconnection becomes the dominant factor altering the zonal shift and width change of the EAS. Article in Journal/Newspaper Bering Sea North Atlantic North Atlantic oscillation Siberia IOP Publishing Bering Sea Pacific Environmental Research Letters 16 12 124028 |
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Abstract The East Asian winter monsoon (EAWM) exhibits long-term variations in intensity and spatial pattern, though the latter one is less understood. To investigate the long-term spatial variations of the EAWM and their possible causes, we propose a new position index of the EAWM by quantifying the low-level East Asian stream (EAS) of cold airmass in the Lagrangian sense. Based on the new-defined index, we find that the EAS undergoes an evident zonal shift between two channels over the land and coast. At interdecadal timescale, the peak location of the EAS is displaced eastward, with an increasing southward cold airmass flux at the coast since the mid-1960s. The interannual shift of the EAS presents not only the zonal oscillation of peak location between two channels but also the width changes of coastal channel over the northwestern Pacific. These shifts in the EAS are related to the strength changes of two source cold airmass streams from Siberia or Bering Sea, which are associated with the phase changes in the upper-tropospheric atmospheric teleconnections. At interdecadal timescale, the phase change in the North Atlantic Oscillation modulates the zonal shift in the EAS via the East Atlantic-West Russia teleconnection. At interannual timescale, the Pacific/North American teleconnection becomes the dominant factor altering the zonal shift and width change of the EAS. |
author2 |
Guangdong Major Project National Natural Science Foundation of China |
format |
Article in Journal/Newspaper |
author |
Liu, Qian Chen, Guixing |
spellingShingle |
Liu, Qian Chen, Guixing Zonal shift in the cold airmass stream of the East Asian winter monsoon |
author_facet |
Liu, Qian Chen, Guixing |
author_sort |
Liu, Qian |
title |
Zonal shift in the cold airmass stream of the East Asian winter monsoon |
title_short |
Zonal shift in the cold airmass stream of the East Asian winter monsoon |
title_full |
Zonal shift in the cold airmass stream of the East Asian winter monsoon |
title_fullStr |
Zonal shift in the cold airmass stream of the East Asian winter monsoon |
title_full_unstemmed |
Zonal shift in the cold airmass stream of the East Asian winter monsoon |
title_sort |
zonal shift in the cold airmass stream of the east asian winter monsoon |
publisher |
IOP Publishing |
publishDate |
2021 |
url |
http://dx.doi.org/10.1088/1748-9326/ac36f5 https://iopscience.iop.org/article/10.1088/1748-9326/ac36f5 https://iopscience.iop.org/article/10.1088/1748-9326/ac36f5/pdf |
geographic |
Bering Sea Pacific |
geographic_facet |
Bering Sea Pacific |
genre |
Bering Sea North Atlantic North Atlantic oscillation Siberia |
genre_facet |
Bering Sea North Atlantic North Atlantic oscillation Siberia |
op_source |
Environmental Research Letters volume 16, issue 12, page 124028 ISSN 1748-9326 |
op_rights |
http://creativecommons.org/licenses/by/4.0 https://iopscience.iop.org/info/page/text-and-data-mining |
op_doi |
https://doi.org/10.1088/1748-9326/ac36f5 |
container_title |
Environmental Research Letters |
container_volume |
16 |
container_issue |
12 |
container_start_page |
124028 |
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1802642896737796096 |