Effect of the mean flow on the anomalous anticyclone over the Indo-Northwest Pacific in post-El Nino summers
文献类型：期刊论文
| 作者 | Hu, Kaiming3,4; Huang, Gang3,4,5; Xie, Shang-Ping; Long, Shang-Min; hkm@mail.iap.ac.cn |
| 刊名 | CLIMATE DYNAMICS
 |
| 出版日期 | 2019 |
| 卷号 | 53期号:2020-09-10页码:5725 |
| 关键词 | ENSO East Asian Climate Anomalous anticyclone |
| DOI | 10.1007/s00382-019-04893-z |
| 英文摘要 | A large-scale anomalous anticyclone (AAC) is a recurrent pattern in post-El Nino summers, extending from the tropical Northwest Pacific (NWP) to the North Indian Ocean. In boreal summer, there is a strongly confluent lower-level flow between the monsoonal westerlies and easterly trades over the Indo-Northwest Pacific. The effect of this basic state confluent flow on the AAC is investigated with energetics analysis and numerical modeling. The results show that the lower-level mean flow over the Indo-Northwest Pacific aids the AAC development. Specifically, the conversion of kinetic energy from the mean confluent flow to perturbations helps amplify easterly anomalies over the Indo-Northwest Pacific in post-El Nino summers. The enhanced easterly wind anomalies provide a positive feedback onto the AAC by inducing surface Ekman divergence to suppress convection over the NWP. Moreover, the structure of the optimal diabatic heating for the AAC pattern is determined using a method similar to the Green's function approach. The optimal forcing features heating in the tropical Indian Ocean and cooling in the NWP. This suggests that barotropic energy conversion in the confluence zone and the El Nino-induced positive (negative) sea surface temperature anomalies over the TIO (NWP) together lead to the AAC development over the Indo-Northwest Pacific in post-El Nino summers. |
| 资助机构 | Strategic Priority Research Program of Chinese Academy of SciencesChinese Academy of Sciences [XDA20060502]; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [41425086, 41661144016, 41706026]; U.S. National Science FoundationNational Science Foundation (NSF) [1637450]; State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences [LTO1704] ; Strategic Priority Research Program of Chinese Academy of SciencesChinese Academy of Sciences [XDA20060502]; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [41425086, 41661144016, 41706026]; U.S. National Science FoundationNational Science Foundation (NSF) [1637450]; State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences [LTO1704] |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/18203]  |
| 专题 | 南海海洋研究所_热带海洋环境国家重点实验室(LTO) |
| 作者单位 | 1.Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA 2.Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China 3.Chinese Acad Sci, IAP, State Key Lab Numer Modeling Atmospher Sci & Geop, POB 9804, Beijing 100029, Peoples R China 4.Chinese Acad Sci, IAP, Ctr Monsoon Syst Res, POB 9804, Beijing 100029, Peoples R China 5.JCGCS, Beijing 100875, Peoples R China 6.Qingdao Natl Lab Marine Sci & Technol, Lab Reg Oceanog & Numer Modeling, Qingdao 266237, Shandong, Peoples R China 7.Hohai Univ, Coll Oceanog, Nanjing, Jiangsu, Peoples R China |
| 推荐引用方式 GB/T 7714 | Hu, Kaiming,Huang, Gang,Xie, Shang-Ping,et al. Effect of the mean flow on the anomalous anticyclone over the Indo-Northwest Pacific in post-El Nino summers[J]. CLIMATE DYNAMICS,2019,53(2020-09-10):5725, 5741. |
| APA | Hu, Kaiming,Huang, Gang,Xie, Shang-Ping,Long, Shang-Min,&hkm@mail.iap.ac.cn.(2019).Effect of the mean flow on the anomalous anticyclone over the Indo-Northwest Pacific in post-El Nino summers.CLIMATE DYNAMICS,53(2020-09-10),5725. |
| MLA | Hu, Kaiming,et al."Effect of the mean flow on the anomalous anticyclone over the Indo-Northwest Pacific in post-El Nino summers".CLIMATE DYNAMICS 53.2020-09-10(2019):5725. |
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来源：南海海洋研究所
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