Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1007/s00382-017-3647-4 |
Control of the South Atlantic Convergence Zone by extratropical thermal forcing | |
Talento, Stefanie; Barreiro, Marcelo | |
2018-02-01 | |
发表期刊 | CLIMATE DYNAMICS
![]() |
ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2018 |
卷号 | 50页码:885-900 |
文章类型 | Article |
语种 | 英语 |
国家 | Uruguay |
英文摘要 | The response of the South Atlantic Convergence Zone (SACZ) to an extratropical thermal forcing is investigated in a series of simulations performed with an atmospheric general circulation model coupled to a slab ocean model. Three sets of experiments are performed, varying the extratropical forcing. In the first the forcing consists of warming of the Northern Hemisphere (NH) and cooling of the Southern Hemisphere, with zero global average. In the second and third experiments, the former forcing is divided into its northern and southern components to asses their relative roles in affecting the SACZ. In all the cases realistic surface boundary conditions are implemented. We found that during its peak in austral summer the SACZ weakens in response to the extratropical forcing and that such weakening is mostly due to the NH component of the forcing. We found that 75% of the SACZ signal in response to the forcing is linked to the generation of a secondary tropical convergence zone in the Atlantic Ocean around 20A degrees N-30A degrees N, which generates an anomalous Hadley circulation with subsidence over the SACZ. This mechanism appears to be dependent on the upper level changes and tropical ocean response, as it weakens significantly when the simulation is repeated not allowing the tropical sea surface temperatures to change in response to the forcing. The remaining 25% of the signal can be explained through the development of a Walker-type of circulation between western tropical Africa and the SACZ, being this mechanism dependent on the African land surface temperature reaction to the remote forcing. |
英文关键词 | SACZ Extratropical forcing Tropical sea surface temperatures Slab ocean model |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000425328700009 |
WOS关键词 | SURFACE-TEMPERATURE ; VARIABILITY ; CIRCULATION ; RAINFALL ; MODEL ; GCM ; PRECIPITATION ; SIMULATIONS ; INTENSITY ; ANOMALIES |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/36339 |
专题 | 气候变化 |
作者单位 | Univ Republica, Inst Phys, Sch Sci, Dept Atmospher Sci, Montevideo 11400, Uruguay |
推荐引用方式 GB/T 7714 | Talento, Stefanie,Barreiro, Marcelo. Control of the South Atlantic Convergence Zone by extratropical thermal forcing[J]. CLIMATE DYNAMICS,2018,50:885-900. |
APA | Talento, Stefanie,&Barreiro, Marcelo.(2018).Control of the South Atlantic Convergence Zone by extratropical thermal forcing.CLIMATE DYNAMICS,50,885-900. |
MLA | Talento, Stefanie,et al."Control of the South Atlantic Convergence Zone by extratropical thermal forcing".CLIMATE DYNAMICS 50(2018):885-900. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论