The Holton-Tan mechanism under stratospheric aerosol interventions ...

• Main Authors: Karami, Khalil, Garcia, Rolando, Jacobi, Christoph, Richter, Jadwiga H., Tilmes, Simone
• Format: Conference Object
• Language: unknown
• Published: GFZ German Research Centre for Geosciences 2023
• Subjects: Arctic; Global warming
• Online Access: https://dx.doi.org/10.57757/iugg23-0025; https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017072

<!--!introduction!--> With a warming climate and possible stratospheric aerosol Interventions (SAI), the Holton-Tan (HT) relationship (the teleconnection between the Quasi-Biennial Oscillation (QBO) and the Arctic stratospheric polar vortex) may have another mechanism and pathway, compared to the present-day climate (PDC). Our results from an Earth system model indicate that, under both global warming (based on the RCP8.5 emission scenario) and SAI, the HT relationship weakens, although the HT relationship is closer to PDC under SAG than under RCP8.5. While the weakening of the HT relationship under the RCP8.5 scenario is likely due to the weaker QBO wind amplitudes at the equator, another physical mechanism must lead to a weaker HT relationship under the SAI scenario since the amplitude of the QBO wind is comparable to the PDC. While the strength of the polar vortex does not change under RCP85 compared to PDC, it becomes stronger under SAG, and we attribute the weakening of the HT relationship under ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ...