Linkage between the East Asian January temperature extremes and the preceding Arctic Oscillation
ABSTRACT This study investigated the potential connection of the October–December Arctic Oscillation ( AO‐OND ) with the following January East Asian temperature extremes and the possible mechanisms. It was found that the extreme cold (warm) events are less (more) frequent in January over East Asia...
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crwiley:10.1002/joc.4399 2024-09-15T17:35:52+00:00 Linkage between the East Asian January temperature extremes and the preceding Arctic Oscillation He, Shengping Wang, Huijun National Natural Science Foundation of China 2015 http://dx.doi.org/10.1002/joc.4399 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjoc.4399 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.4399 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor International Journal of Climatology volume 36, issue 2, page 1026-1032 ISSN 0899-8418 1097-0088 journal-article 2015 crwiley https://doi.org/10.1002/joc.4399 2024-08-13T04:18:30Z ABSTRACT This study investigated the potential connection of the October–December Arctic Oscillation ( AO‐OND ) with the following January East Asian temperature extremes and the possible mechanisms. It was found that the extreme cold (warm) events are less (more) frequent in January over East Asia following a positive phase of AO‐OND , which might be attributed to the intrinsic persistence of AO‐OND in stratosphere and the memory of Eurasian snow cover. It is revealed that the barotropic structure of AO‐OND could extend to stratosphere. By the following January, wave activities propagate from stratosphere downwards to upper troposphere, then bent equatorwards to mid‐latitudes. Consequently, the January circumpolar jet (polar vortex) gets strengthened (colder) because the equatorward‐pointing (upwards) wave activities correspond to poleward meridional eddy momentum (eddy heat) flux. In such a way, the anomalous AO‐OND persists into the following January. On the other hand, positive phase of AO‐OND causes significant surface warming in most parts of Eurasia, leading to Eurasian snow melt. The October–December snow melt has intrinsic climatic memory and further weakens the January Siberian High through reducing surface albedo. Besides, the surface warming in North Europe because of reduced surface albedo caused by snow melt could stimulate a Rossby wave train propagating eastwards across Eurasia, which restrains the blocking events around Ural region. In such a context, the incidence of extreme warm (cold) events over East Asia is more (less) frequent. Article in Journal/Newspaper albedo Wiley Online Library International Journal of Climatology 36 2 1026 1032 |
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Wiley Online Library |
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crwiley |
language |
English |
description |
ABSTRACT This study investigated the potential connection of the October–December Arctic Oscillation ( AO‐OND ) with the following January East Asian temperature extremes and the possible mechanisms. It was found that the extreme cold (warm) events are less (more) frequent in January over East Asia following a positive phase of AO‐OND , which might be attributed to the intrinsic persistence of AO‐OND in stratosphere and the memory of Eurasian snow cover. It is revealed that the barotropic structure of AO‐OND could extend to stratosphere. By the following January, wave activities propagate from stratosphere downwards to upper troposphere, then bent equatorwards to mid‐latitudes. Consequently, the January circumpolar jet (polar vortex) gets strengthened (colder) because the equatorward‐pointing (upwards) wave activities correspond to poleward meridional eddy momentum (eddy heat) flux. In such a way, the anomalous AO‐OND persists into the following January. On the other hand, positive phase of AO‐OND causes significant surface warming in most parts of Eurasia, leading to Eurasian snow melt. The October–December snow melt has intrinsic climatic memory and further weakens the January Siberian High through reducing surface albedo. Besides, the surface warming in North Europe because of reduced surface albedo caused by snow melt could stimulate a Rossby wave train propagating eastwards across Eurasia, which restrains the blocking events around Ural region. In such a context, the incidence of extreme warm (cold) events over East Asia is more (less) frequent. |
author2 |
National Natural Science Foundation of China |
format |
Article in Journal/Newspaper |
author |
He, Shengping Wang, Huijun |
spellingShingle |
He, Shengping Wang, Huijun Linkage between the East Asian January temperature extremes and the preceding Arctic Oscillation |
author_facet |
He, Shengping Wang, Huijun |
author_sort |
He, Shengping |
title |
Linkage between the East Asian January temperature extremes and the preceding Arctic Oscillation |
title_short |
Linkage between the East Asian January temperature extremes and the preceding Arctic Oscillation |
title_full |
Linkage between the East Asian January temperature extremes and the preceding Arctic Oscillation |
title_fullStr |
Linkage between the East Asian January temperature extremes and the preceding Arctic Oscillation |
title_full_unstemmed |
Linkage between the East Asian January temperature extremes and the preceding Arctic Oscillation |
title_sort |
linkage between the east asian january temperature extremes and the preceding arctic oscillation |
publisher |
Wiley |
publishDate |
2015 |
url |
http://dx.doi.org/10.1002/joc.4399 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjoc.4399 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.4399 |
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albedo |
genre_facet |
albedo |
op_source |
International Journal of Climatology volume 36, issue 2, page 1026-1032 ISSN 0899-8418 1097-0088 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/joc.4399 |
container_title |
International Journal of Climatology |
container_volume |
36 |
container_issue |
2 |
container_start_page |
1026 |
op_container_end_page |
1032 |
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1810483113254453248 |