Roles of north Indian Ocean and tropical Atlantic SST in latitudinal extension of western North Pacific anticyclone during El Niño ...

• Main Author: Feng, Juan
• Format: Conference Object
• Language: unknown
• Published: GFZ German Research Centre for Geosciences 2023
• Subjects: Indian; Pacific; North Atlantic
• Online Access: https://dx.doi.org/10.57757/iugg23-2208; https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018620

<!--!introduction!--> The El Niño-related anomalous western North Pacific anticyclone (WNPAC) shows different latitudinal extensions during the El Niño decaying summer, which determines the moisture transport to different regions and leads to distinct climate impacts over East Asia. It is known that both the north Indian Ocean (NIO) sea surface temperature (SST) and the tropical North Atlantic (TNA) SST can generate a WNPAC in summer. However, the difference between the NIO SST-forced WNPAC and the TNA SST-forced WNPAC has hardly been noted before now. This study shows that the NIO SST warming makes the WNPAC contract southward, whereas the TNA SST warming makes the WNPAC extend northward. The NIO SST warming generates the WNPAC via a Kelvin wave response. Owing to the limited domain of Kelvin wave activity, the Kelvin wave-induced suppressed convection over the western Pacific is confined south of 20°N, resulting in the WNPAC being concentrated in the low latitudes. In contrast, the TNA SST warming ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ...