The 2020–2021 prolonged La Ni?a evolution in the tropical Pacific
文献类型：CNKI期刊论文
| 作者 | Chuan GAO ; Maonan CHEN; Lu ZHOU; Licheng FENG; Rong-Hua ZHANG
|
| 发表日期 | 2022-11-11 |
| 出处 | Science China(Earth Sciences)
 |
| 关键词 | Prolonged La Ni?a evolution in 2020–2021 Subsurface effect on SST Remote and local processes Modeling experiments |
| 英文摘要 | The evolution of sea surface temperature(SST) in the tropical Pacific during 2020–2021 indicates a second-year cooling in late 2021 again, following the 2020 La Ni?a event. Its physical explanations are still lacking, and there is a clear need to understand the underlying processes involved. Observational data and reanalysis products are used to describe the characteristics and spatiotemporal evolution of upper-ocean thermal anomalies; an intermediate coupled model(ICM) is also used to perform numerical experiments to confirm these observation-based inferences. The evolution of subsurface thermal anomalies is critically important to that of SST in the central-eastern equatorial Pacific; the effects of the former on the latter can be well represented by the temperature of subsurface waters entrained into the mixed layer(Te), a field that reflects a subsurface forcing on SST. The SST evolution is sensitively dependent on the intensities of the local effect associated with Teanomalies in the eastern equatorial Pacific and the remote effect associated with subsurface anomalies from the western Pacific. During early-and mid-2021, a competition was present between these local and remote effects associated with Teanomalies. When the remote warming effect dominates the local cooling effect, the cold SST condition in the east is likely to turn into neutral and warm conditions; otherwise, it tends to continue. In addition, the negative Teanomalies were sustained and enhanced by off-equatorial processes due to equatorial wave reflections at the eastern boundary associated with the 2020 La Ni?a event. The SST evolution in mid-2021 corresponded to a situation in which the warming effect associated with positive subsurface thermal anomalies from the west were not strong enough to counteract the local cooling effect associated with negative anomalies in the east. In due course, cold SST anomalies in the east developed again and the second-year cooling reoccurred in late 2021, with a turning point in June 2021. Modeling experiments support these arguments and indicate that the intensity of subsurface thermal effect on SST,as represented by Teanomalies, needs to be adequately depicted for coupled models to capture the 2021 second-year cooling conditions in the tropical Pacific. |
| 文献子类 | CNKI期刊论文 |
| 资助机构 | supported by the Laoshan Laboratory(Grant No. 2022LSL010301-2) ; the National Natural Science Foundation of China (Grant No. 42176032) ; the National Natural Science Foundation of China (Grant No. 42030410) ; the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB 42000000) ; supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant Nos. XDA19060102 and XDB40000000) |
| 卷 | v.65期:12页:34-52 |
| 语种 | 英文; |
| 分类号 | P732 |
| ISSN号 | 1674-7313 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/187283]  |
| 专题 | 中国科学院海洋研究所 |
| 作者单位 | 1.SchoolofMarineSciences,NanjingUniversityofInformationScienceandTechnology 2.KeyLaboratoryofOceanCirculationandWaves,InstituteofOceanology,CenterforOceanMega-Science,ChineseAcademyofSciences 3.LaoshanLaboratory 4.UniversityofChineseAcademyofSciences 5.NationalMarineEnvironmentalForecastingCenter,MinistryofNaturalResources 6.CenterforExcellenceinQuaternaryScienceandGlobalChange,ChineseAcademyofSciences |
| 推荐引用方式 GB/T 7714 | Chuan GAO,Maonan CHEN,Lu ZHOU,et al. The 2020–2021 prolonged La Ni?a evolution in the tropical Pacific. 2022. |
入库方式： OAI收割
来源：海洋研究所
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