Impacts of Central Tropical Pacific SST on the Reversal of December and January Surface Air Temperature Anomalies Over Central Asia
The reversal of winter surface air temperature anomalies (SATAs) over Central Asia (CA) between December and January is investigated in this study and found to be closely related to the sea surface temperature anomalies (SSTAs) over the central tropical Pacific (CTP). The cold CTP SSTAs can lead to...
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ftdoajarticles:oai:doaj.org/article:753552f0ee664e91bc9e4e08af470b57 2023-05-15T17:29:47+02:00 Impacts of Central Tropical Pacific SST on the Reversal of December and January Surface Air Temperature Anomalies Over Central Asia Haishan Li Ke Fan Hua Li Zhiqing Xu 2022-03-01T00:00:00Z https://doi.org/10.3389/feart.2022.873040 https://doaj.org/article/753552f0ee664e91bc9e4e08af470b57 EN eng Frontiers Media S.A. https://www.frontiersin.org/articles/10.3389/feart.2022.873040/full https://doaj.org/toc/2296-6463 2296-6463 doi:10.3389/feart.2022.873040 https://doaj.org/article/753552f0ee664e91bc9e4e08af470b57 Frontiers in Earth Science, Vol 10 (2022) central Asia surface air temperature anomaly sea surface temperature anomaly central tropical Pacific Rossby wave Science Q article 2022 ftdoajarticles https://doi.org/10.3389/feart.2022.873040 2022-12-31T13:41:02Z The reversal of winter surface air temperature anomalies (SATAs) over Central Asia (CA) between December and January is investigated in this study and found to be closely related to the sea surface temperature anomalies (SSTAs) over the central tropical Pacific (CTP). The cold CTP SSTAs can lead to positive (negative) SATAs over CA in December (January). The different responses of SATAs over CA to the SSTAs are attributed to different Rossby wave propagations. In December, a wave train from the North Pacific directly reaches CA, while in January it mainly propagates in the meridional direction and cannot reach CA. The January SATAs of CA are influenced by a wave train from the North Atlantic, which is induced by CTP SSTAs indirectly. The wave trains from the North Pacific are mainly driven by the Gill-type response to the cold CTP SSTA in both December and January. In January, since the climatological subtropical jet stream over the North Pacific is stronger and situated more towards the equator, a stronger Gill-type response is excited and causes the meridional propagation of the Rossby waves. Then, this stronger Gill-type response can cause strong zonal wind anomalies over the East Pacific. Local anomalies of the synoptic-scale transient eddy can be further caused by the zonal wind anomalies and travel eastward to the North Atlantic. The eddy-induced geopotential anomalies over the North Atlantic can further trigger Rossby waves and cause the negative SATAs over CA. Numerical simulations reproduce these mechanisms. Article in Journal/Newspaper North Atlantic Directory of Open Access Journals: DOAJ Articles Pacific Frontiers in Earth Science 10 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
central Asia surface air temperature anomaly sea surface temperature anomaly central tropical Pacific Rossby wave Science Q |
spellingShingle |
central Asia surface air temperature anomaly sea surface temperature anomaly central tropical Pacific Rossby wave Science Q Haishan Li Ke Fan Hua Li Zhiqing Xu Impacts of Central Tropical Pacific SST on the Reversal of December and January Surface Air Temperature Anomalies Over Central Asia |
topic_facet |
central Asia surface air temperature anomaly sea surface temperature anomaly central tropical Pacific Rossby wave Science Q |
description |
The reversal of winter surface air temperature anomalies (SATAs) over Central Asia (CA) between December and January is investigated in this study and found to be closely related to the sea surface temperature anomalies (SSTAs) over the central tropical Pacific (CTP). The cold CTP SSTAs can lead to positive (negative) SATAs over CA in December (January). The different responses of SATAs over CA to the SSTAs are attributed to different Rossby wave propagations. In December, a wave train from the North Pacific directly reaches CA, while in January it mainly propagates in the meridional direction and cannot reach CA. The January SATAs of CA are influenced by a wave train from the North Atlantic, which is induced by CTP SSTAs indirectly. The wave trains from the North Pacific are mainly driven by the Gill-type response to the cold CTP SSTA in both December and January. In January, since the climatological subtropical jet stream over the North Pacific is stronger and situated more towards the equator, a stronger Gill-type response is excited and causes the meridional propagation of the Rossby waves. Then, this stronger Gill-type response can cause strong zonal wind anomalies over the East Pacific. Local anomalies of the synoptic-scale transient eddy can be further caused by the zonal wind anomalies and travel eastward to the North Atlantic. The eddy-induced geopotential anomalies over the North Atlantic can further trigger Rossby waves and cause the negative SATAs over CA. Numerical simulations reproduce these mechanisms. |
format |
Article in Journal/Newspaper |
author |
Haishan Li Ke Fan Hua Li Zhiqing Xu |
author_facet |
Haishan Li Ke Fan Hua Li Zhiqing Xu |
author_sort |
Haishan Li |
title |
Impacts of Central Tropical Pacific SST on the Reversal of December and January Surface Air Temperature Anomalies Over Central Asia |
title_short |
Impacts of Central Tropical Pacific SST on the Reversal of December and January Surface Air Temperature Anomalies Over Central Asia |
title_full |
Impacts of Central Tropical Pacific SST on the Reversal of December and January Surface Air Temperature Anomalies Over Central Asia |
title_fullStr |
Impacts of Central Tropical Pacific SST on the Reversal of December and January Surface Air Temperature Anomalies Over Central Asia |
title_full_unstemmed |
Impacts of Central Tropical Pacific SST on the Reversal of December and January Surface Air Temperature Anomalies Over Central Asia |
title_sort |
impacts of central tropical pacific sst on the reversal of december and january surface air temperature anomalies over central asia |
publisher |
Frontiers Media S.A. |
publishDate |
2022 |
url |
https://doi.org/10.3389/feart.2022.873040 https://doaj.org/article/753552f0ee664e91bc9e4e08af470b57 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Frontiers in Earth Science, Vol 10 (2022) |
op_relation |
https://www.frontiersin.org/articles/10.3389/feart.2022.873040/full https://doaj.org/toc/2296-6463 2296-6463 doi:10.3389/feart.2022.873040 https://doaj.org/article/753552f0ee664e91bc9e4e08af470b57 |
op_doi |
https://doi.org/10.3389/feart.2022.873040 |
container_title |
Frontiers in Earth Science |
container_volume |
10 |
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1766124582577635328 |