青藏高原与太平洋/大西洋热力作用对北半球陆地夏季风年际变化的协同影响

项目名称： 青藏高原与太平洋/大西洋热力作用对北半球陆地夏季风年际变化的协同影响

项目编号： No.91437218

项目类型： 重大研究计划

立项/批准年度： 2015

项目学科： 天文学、地球科学

项目作者： 赵平

作者单位： 中国气象科学研究院

项目金额： 340万元

中文摘要： 北半球有全球最显著的区域季风（西非季风、南亚季风、东亚季风和北美季风）。关于青藏高原陆–气相互作用、印度洋–太平洋海–气相互作用对东亚季风影响的研究已经不少，特别是已有青藏高原研究计划重点项目正在研究高原热力作用和热带海洋温度模态（如ENSO和印度洋海盆温度模态）对东亚夏季风爆发、推进和强度年际变率的相对重要性和相互作用；而关于青藏高原热源与太平洋/大西洋热力强迫对其他区域季风的协同影响研究还很少。因此，本项目利用气象站资料、大气再分析资料及卫星产品等，从统计分析、物理量诊断和数值模拟方面，研究青藏高原热状况年际变化与太平洋、大西洋热力作用之间的相互关系及其对北半球夏季风年际变率的独立和协同影响，从而深入认识青藏高原与太平洋/大西洋热力作用协同影响北半球夏季风年际变率的机制。该研究内容与已有的不同，也是青藏高原重大研究计划的核心之一。

中文关键词： 青藏高原热力作用；太平洋/大西洋热力作用；协同影响；北半球陆地夏季风；年际变化

英文摘要： The Northern Hemisphere has the most remarkable regional monsoons (including West African monsoon, South Asian monsoon, East Asian monsoon, and North American monsoon). The previous studies paid more attention to effects of land-air interactions over the Tibetan Plateau (TP) and ocean-air interactions over the Pacific and Indian Oceans on the East Asian monsoon, especially the relative contributions and interactions between the TP thermodynamic forcing and the tropical ocean temperature modes (e.g., ENSO and the Indian Ocean basin temperature mode) on interannual variations of the onset, advance, and intensity of East Asian summer monsoon (supported by a key project of the NSFC’s Tibetan plan). However, there are little studies on effects of the TP and Pacific/Atlantic thermodynamic functions on the other regional monsoons. Therefore, using observational data at meteorological stations, atmospheric reanalysis datasets, and satellite products as well as statistical analysis, physical diagnosis, and numerical simulation methods, this project will investigate interannual varying features of the TP heating and its links with the Pacific/Atlantic thermodynamic forcing, explore the individual or collaborative impacts of these factors on interannual variability of African, South Asian, and North American monsoons, and compare these impacts with those impacts on the East Asian monsoon. This is distinguished from the previous studies and could deepen our understanding about the mechanisms for collaborative influences of the TP and Pacific/Atlantic thermodynamic functions on interannual variations over the Northern Hemispheric land summer monsoon. This study is also one of the core researches listed in the NSFC’s Tibetan plan.

英文关键词： Tibetan Plateau thermodynamic function;Pacific/Atlantic thermodynamic function;Collaborative influences;Northern hemispheric land summer monsoon;Interannual variation