Southeast China extreme drought event in August 2019: Context of coupling of mid-latitude and tropical systems ...

• Main Authors: Jiang, Jilan, Su, Tonghua, Liu, Yimin, Wu, Guoxiong, Yu, Wei, Li, Jinxiao
• 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/iugg23-0636; https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016853

<!--!introduction!--> An extreme drought occurred over Southeast China (SEC) in August 2019. We demonstrate synergistic effects of mid-latitude and tropical circulation on this extreme event and highlight the impacts of the coupling and locking of two cyclones at different latitudes, which are otherwise ignored. We propose the relaying roles of the Tibetan Plateau (TP) and western North Pacific in connection with the tropical convection and SEC precipitation. The equivalent-barotropic anticyclone over the TP and low-tropospheric cyclone over the western North Pacific both resulted from the positive Indian Ocean dipole and El Niño Modoki. The equivalent-barotropic cyclone over Northeast China originated from the dispersion of Rossby waves upstream along the subtropical waveguide associated with the North Atlantic tripole sea surface temperature anomaly pattern and the Rossby wave response to the TP precipitation deficiency. Further, they jointly contributed to this drought by inducing strong northerly ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ...