Effect of the late-1990S change in tropical forcing on teleconnections to the Amundsen–Bellingshausen seas region during austral Autumn ...
<!--!introduction!--> Tropical sea surface temperature (SST) and associated precipitation, acting as diabatic heat forcing, has far- reaching climatic impacts across the globe through exciting poleward-propagating Rossby waves. It is found that the leading mode of tropical Pacific forcing in a...
| Main Authors: | , , , |
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| Format: | Conference Object |
| Language: | unknown |
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GFZ German Research Centre for Geosciences
2023
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| Online Access: | https://dx.doi.org/10.57757/iugg23-1156 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017477 |
| Summary: | <!--!introduction!--> Tropical sea surface temperature (SST) and associated precipitation, acting as diabatic heat forcing, has far- reaching climatic impacts across the globe through exciting poleward-propagating Rossby waves. It is found that the leading mode of tropical Pacific forcing in austral autumn experiences a significant interdecadal shift from an eastern Pacific (EP) to a central Pacific (CP) type around the late 1990s. More specifically, the EP-type precipitation anomaly mode before 1998 drives a quadrupole-like teleconnection pathway emanating from the tropical Pacific to the Ross Sea and Amundsen–Bellingshausen Seas (ABS) region, whereas the CP-type mode after 1999 excites a Pacific–South American (PSA)-like teleconnection orienting along a great circle. Divergent flows induced by different precipitation anomaly modes primarily determine the generation of Rossby waves by means of the vortex stretching and vorticity advection processes. Furthermore, the synoptic high-frequency transient ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ... |
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