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RISS 인기검색어
- 검색키워드
- 저자 : Minling Ke (검색결과 2 건)
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Minling Ke,Ziqian Wang,Weijuan Pan,Haolin Luo,Song Yang,Ruyue Guo 한국기상학회 2023 Asia-Pacific Journal of Atmospheric Sciences Vol.59 No.1
The variation of the western Pacific subtropical high (WPSH) significantly influences the weather and climate in East Asia. El Niño-Southern Oscillation (ENSO) is considered as one of the most important factors for the abnormal activity of the WPSH. An El Niño event tends to result in an anticyclonic anomaly over the western Pacific in the following spring and summer, leading to a westward-shifted and stronger WPSH. Opposite features can be observed for a La Niña event. Following the typical La Niña event in the winter of 2020/2021, an abnormal cyclonic circulation routinely appeared over the western Pacific in the beginning of 2021, but it was suddenly replaced by an obviously abnormal anticyclone in May. This unanticipated change induced an extremely strong WPSH and posed a challenge for the regional climate prediction. A careful examination of the tropical Indian Ocean revealed a significant abnormal warming process from April to May in 2021, with a peak of positive sea surface temperature anomaly (SSTA) in early May. Consequently, persistent atmospheric convective activity was stimulated by the positive SSTA, accompanied by remarkable and eastward-moving diabatic heating in the tropical Indian Ocean. The convective heating aroused significant easterly anomalies in the form of a Kelvin wave response of the Gill-type mode over the equatorial region from the western Pacific to the eastern Indian Ocean, which induced an abnormal anticyclone through a further positive circulation–convection feedback over the western Pacific. Additional experiments with the LBM model further verify that the persistent convective forcing over the tropical Indian Ocean is responsible for the extremely strong WPSH in May 2021, although during an antecedent La Niña event.
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Wang Ziqian,Xu Juan,Zeng Zhuoyu,Ke Minling,Feng Xinhua 한국기상학회 2024 Asia-Pacific Journal of Atmospheric Sciences Vol.60 No.4
The most frequent and concentrated rainfall in the pre-flood season in South China usually occurs around the Dragon Boat Festival every year, locally known as ‘Dragon-boat Rainfall (DBR)’. In 2022, a record-breaking DBR attacked South China, causing disastrous flooding. We suggest that this extreme DBR was jointly regulated by the tropical convective forcing and Tibetan Plateau (TP) heating. Distinctly strong low-level southwesterlies and ascending motions over South China were the key atmospheric conditions. And the abnormal low-level southwesterlies were contributed by both the anomalous anticyclone over the western North Pacific and the anomalous westerlies at the southern side of the TP. On the one hand, during the period of 2022 DBR, stronger-than-normal convective forcing over the Maritime Continent induced the low-level anomalous anticyclone over the western North Pacific through triggering the meridional vertical circulation and further promoted the upward motions over South China. On the other hand, positive diabatic heating over the TP forced abnormal warm anticyclone in the mid-upper troposphere, more warm air advected downstream by the background westerlies, intensifying the upward motions over South China. Meanwhile, the TP heating could induce the anomalous low-level westerlies at the southern side of the TP, which further merged into and intensified the southwesterlies over South China and greatly enhanced the moisture transport and convergence there. Therefore, we highlight the strong thermal forcing over the TP, exerting a combined and amplified effect with the convective forcing over the Maritime Continent, dominated the record-breaking DBR in 2022.
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