On the Second-Year Warming in Late 2019 over the Tropical Pacific and Its Attribution to an Indian Ocean Dipole Event
文献类型：CNKI期刊论文
| 作者 | Licheng FENG; Fei LIU; Rong-Hua ZHANG ; Xue HAN; Bo YU; Chuan GAO
|
| 发表日期 | 2021-12-10 |
| 出处 | Advances in Atmospheric Sciences
 |
| 关键词 | second-year warming IOD wind stress anomalies zonal advection feedback thermocline feedback |
| 英文摘要 | After its maturity, El Ni?o usually decays rapidly in the following summer and evolves into a La Ni?a pattern.However, this was not the case for the 2018/19 El Ni?o event. Based on multiple reanalysis data sets, the space-time evolution and triggering mechanism for the unusual second-year warming in late 2019, after the 2018/19 El Ni?o event, are investigated in the tropical Pacific. After a short decaying period associated with the 2018/19 El Ni?o condition, positive sea surface temperature anomalies(SSTAs) re-intensified in the eastern equatorial Pacific in late 2019. Compared with the composite pattern of El Ni?o in the following year, two key differences are evident in the evolution of SSTAs in 2019.First, is the persistence of the surface warming over the central equatorial Pacific in May, and second, is the reintensification of the positive SSTAs over the eastern equatorial Pacific in September. Observational results suggest that the re-intensification of anomalous westerly winds over the western and central Pacific, induced remotely by an extreme Indian Ocean Dipole(IOD) event, acted as a triggering mechanism for the second-year warming in late 2019. That is, the IODrelated cold SSTAs in the eastern Indian Ocean established and sustained anomalous surface westerly winds over the western equatorial Pacific, which induced downwelling Kelvin waves propagating eastward along the equator. At the same time, the subsurface ocean provided plenty of warm water in the western and central equatorial Pacific. Mixed-layer heat budget analyses further confirm that positive zonal advection, induced by the anomalous westerly winds, and thermocline feedback played important roles in leading to the second-year warming in late 2019. This study provides new insights into the processes responsible for the diversity of El Ni?o evolution, which is important for improving the physical understanding and seasonal prediction of El Ni?o events. |
| 文献子类 | CNKI期刊论文 |
| 资助机构 | jointly supported by grants from the National Key Research and Development Program (Grant No. 2018YFC1505802) ; the National Natural Science Foundation of China (Grant Nos. 41576029 ; 42030410 ; 41690122(41690120) ; 41420104002) ; the Strategic Priority Research Program of Chinese Academy of Sciences (Grant Nos.XDA19060102, XDB 40000000 and XDB 42000000) |
| 卷 | v.38期:12页:190-203 |
| 语种 | 英文; |
| 分类号 | P467;P732 |
| ISSN号 | 0256-1530 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/187568]  |
| 专题 | 中国科学院海洋研究所 |
| 作者单位 | 1.KeyLaboratoryofOceanCirculationandWaves,InstituteofOceanologyandCenterforOceanMega-Science,ChineseAcademyofSciences 2.BeijingWeatherForecastCenter 3.NationalMarineEnvironmentalForecastingCenter,MinistryofNaturalResources 4.KeyLaboratoryofMarineHazardsForecasting,NationalMarineEnvironmentalForecastingCenter,MinistryofNaturalResources 5.SchoolofAtmosphericSciencesandGuangdongProvinceKeyLaboratoryforClimateChangeandNaturalDisasterStudies,SunYat-senUniversity 6.SouthernMarineScienceandEngineeringGuangdongLaboratory(Zhuhai) 7.PilotNationalLaboratoryforMarineScienceandTechnology |
| 推荐引用方式 GB/T 7714 | Licheng FENG,Fei LIU,Rong-Hua ZHANG,et al. On the Second-Year Warming in Late 2019 over the Tropical Pacific and Its Attribution to an Indian Ocean Dipole Event. 2021. |
入库方式： OAI收割
来源：海洋研究所
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