Inconsistent ENSO teleconnections over East Asia in early and late winter: role of Siberian land-atmosphere coupling
The El Niño–Southern Oscillation (ENSO) teleconnections over East Asia display inconsistency between early and late winter, yet the undering physical mechanisms remain unclear. Employing causal inference analysis, including Liang-Kleeman information flow and PC-MCI causal discovery, our study reveal...
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2025-01-01
|
| Series: | Environmental Research Letters |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1748-9326/adab08 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832589526975905792 |
|---|---|
| author | Xiadong An Wen Chen Tianjiao Ma Lifang Sheng |
| author_facet | Xiadong An Wen Chen Tianjiao Ma Lifang Sheng |
| author_sort | Xiadong An |
| collection | DOAJ |
| description | The El Niño–Southern Oscillation (ENSO) teleconnections over East Asia display inconsistency between early and late winter, yet the undering physical mechanisms remain unclear. Employing causal inference analysis, including Liang-Kleeman information flow and PC-MCI causal discovery, our study reveals a stable information flow from ENSO to the upper tropospheric atmospheric circulation (250 hPa) over southern East Asia. Building on this, we explore the reason behind the differences in ENSO teleconnections during early and late winter. Findings indicate that Siberian snow water equivalent acts as a ‘land bridge’, storing ENSO signals from early to late winter, which are then released via an ‘atmospheric bridge’ in late winter. Specifically, reduced snow water equivalent from early to late winter facilitates lower surface temperatures in late winter, serving as a cooling source to initiate an ENSO-related wave train over Eurasia. This leads to an inconsistent ENSO teleconnection in late winter, contrasting with early winter, and vice versa. |
| format | Article |
| id | doaj-art-2a65dd3553a347bc8098c5cc86385df6 |
| institution | Kabale University |
| issn | 1748-9326 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Environmental Research Letters |
| spelling | doaj-art-2a65dd3553a347bc8098c5cc86385df62025-01-24T11:58:17ZengIOP PublishingEnvironmental Research Letters1748-93262025-01-0120202403010.1088/1748-9326/adab08Inconsistent ENSO teleconnections over East Asia in early and late winter: role of Siberian land-atmosphere couplingXiadong An0https://orcid.org/0000-0002-8992-0406Wen Chen1https://orcid.org/0000-0001-9327-9079Tianjiao Ma2https://orcid.org/0009-0005-5493-230XLifang Sheng3Department of Atmospheric Sciences, Yunnan University , Kunming, People’s Republic of China; Yunnan Key Laboratory of Meteorological Disasters and Climate Resources in the Greater Mekong Subregion, Yunnan University , Kunming, People’s Republic of China; Department of Marine Meteorology, College of Oceanic and Atmospheric Sciences , Ocean University of China, Qingdao, People’s Republic of ChinaDepartment of Atmospheric Sciences, Yunnan University , Kunming, People’s Republic of China; Yunnan Key Laboratory of Meteorological Disasters and Climate Resources in the Greater Mekong Subregion, Yunnan University , Kunming, People’s Republic of ChinaDepartment of Atmospheric Sciences, Yunnan University , Kunming, People’s Republic of China; Yunnan Key Laboratory of Meteorological Disasters and Climate Resources in the Greater Mekong Subregion, Yunnan University , Kunming, People’s Republic of ChinaDepartment of Marine Meteorology, College of Oceanic and Atmospheric Sciences , Ocean University of China, Qingdao, People’s Republic of ChinaThe El Niño–Southern Oscillation (ENSO) teleconnections over East Asia display inconsistency between early and late winter, yet the undering physical mechanisms remain unclear. Employing causal inference analysis, including Liang-Kleeman information flow and PC-MCI causal discovery, our study reveals a stable information flow from ENSO to the upper tropospheric atmospheric circulation (250 hPa) over southern East Asia. Building on this, we explore the reason behind the differences in ENSO teleconnections during early and late winter. Findings indicate that Siberian snow water equivalent acts as a ‘land bridge’, storing ENSO signals from early to late winter, which are then released via an ‘atmospheric bridge’ in late winter. Specifically, reduced snow water equivalent from early to late winter facilitates lower surface temperatures in late winter, serving as a cooling source to initiate an ENSO-related wave train over Eurasia. This leads to an inconsistent ENSO teleconnection in late winter, contrasting with early winter, and vice versa.https://doi.org/10.1088/1748-9326/adab08ENSOteleconnectionland-atmosphere coupling |
| spellingShingle | Xiadong An Wen Chen Tianjiao Ma Lifang Sheng Inconsistent ENSO teleconnections over East Asia in early and late winter: role of Siberian land-atmosphere coupling Environmental Research Letters ENSO teleconnection land-atmosphere coupling |
| title | Inconsistent ENSO teleconnections over East Asia in early and late winter: role of Siberian land-atmosphere coupling |
| title_full | Inconsistent ENSO teleconnections over East Asia in early and late winter: role of Siberian land-atmosphere coupling |
| title_fullStr | Inconsistent ENSO teleconnections over East Asia in early and late winter: role of Siberian land-atmosphere coupling |
| title_full_unstemmed | Inconsistent ENSO teleconnections over East Asia in early and late winter: role of Siberian land-atmosphere coupling |
| title_short | Inconsistent ENSO teleconnections over East Asia in early and late winter: role of Siberian land-atmosphere coupling |
| title_sort | inconsistent enso teleconnections over east asia in early and late winter role of siberian land atmosphere coupling |
| topic | ENSO teleconnection land-atmosphere coupling |
| url | https://doi.org/10.1088/1748-9326/adab08 |
| work_keys_str_mv | AT xiadongan inconsistentensoteleconnectionsovereastasiainearlyandlatewinterroleofsiberianlandatmospherecoupling AT wenchen inconsistentensoteleconnectionsovereastasiainearlyandlatewinterroleofsiberianlandatmospherecoupling AT tianjiaoma inconsistentensoteleconnectionsovereastasiainearlyandlatewinterroleofsiberianlandatmospherecoupling AT lifangsheng inconsistentensoteleconnectionsovereastasiainearlyandlatewinterroleofsiberianlandatmospherecoupling |