Zonal shift in the cold airmass stream of the East Asian winter monsoon
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-lev...
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ftdoajarticles:oai:doaj.org/article:a2bc2a6b28ff434396522af61e3fa1db 2023-09-05T13:18:31+02:00 Zonal shift in the cold airmass stream of the East Asian winter monsoon Qian Liu Guixing Chen 2021-01-01T00:00:00Z https://doi.org/10.1088/1748-9326/ac36f5 https://doaj.org/article/a2bc2a6b28ff434396522af61e3fa1db EN eng IOP Publishing https://doi.org/10.1088/1748-9326/ac36f5 https://doaj.org/toc/1748-9326 doi:10.1088/1748-9326/ac36f5 1748-9326 https://doaj.org/article/a2bc2a6b28ff434396522af61e3fa1db Environmental Research Letters, Vol 16, Iss 12, p 124028 (2021) East Asian winter monsoon cold airmass position index zonal shift long-term variation atmospheric teleconnection Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 article 2021 ftdoajarticles https://doi.org/10.1088/1748-9326/ac36f5 2023-08-13T00:37:02Z 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 Directory of Open Access Journals: DOAJ Articles Bering Sea Pacific Environmental Research Letters 16 12 124028 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
East Asian winter monsoon cold airmass position index zonal shift long-term variation atmospheric teleconnection Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 |
spellingShingle |
East Asian winter monsoon cold airmass position index zonal shift long-term variation atmospheric teleconnection Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 Qian Liu Guixing Chen Zonal shift in the cold airmass stream of the East Asian winter monsoon |
topic_facet |
East Asian winter monsoon cold airmass position index zonal shift long-term variation atmospheric teleconnection Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Qian Liu Guixing Chen |
author_facet |
Qian Liu Guixing Chen |
author_sort |
Qian Liu |
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 |
https://doi.org/10.1088/1748-9326/ac36f5 https://doaj.org/article/a2bc2a6b28ff434396522af61e3fa1db |
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, Vol 16, Iss 12, p 124028 (2021) |
op_relation |
https://doi.org/10.1088/1748-9326/ac36f5 https://doaj.org/toc/1748-9326 doi:10.1088/1748-9326/ac36f5 1748-9326 https://doaj.org/article/a2bc2a6b28ff434396522af61e3fa1db |
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 |
_version_ |
1776199469841252352 |