Collaborative Research: NSFGEO-NERC: Solving the conundrum of the Miocene South Asian Monsoon.

合作研究：NSFGEO-NERC：解决中新世南亚季风的难题。

• 批准号: 2217529
• 负责人: Guangsheng Zhuang
• 金额: $ 65.29万
• 依托单位: Louisiana State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-09-01 至 2025-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2217529&HistoricalAwards=false
• 关键词: Collaborative; Research; NSFGEO; NERC; Solving

The South Asian Monsoon is one of the most important atmospheric circulation systems. It determines the water resources of the planet's most densely inhabited places and directly influences more than one billion people. The South Asian Monsoon regions are undergoing active mountain building and display strong topographic relief. The region experiences dramatic gradients in rainfall and ocean temperatures and productivity. The varying rainfall patterns may have global economic repercussions. Indeed, extreme climate events in recent years have had large social and economic impacts in the Himalayan regions and beyond. Modeling predictions based only on instrumental date are unlikely to portray the entire spectrum of the South Asian Monsoon. To better understand modern variability and future changes in the system, long time series of past monsoonal activity are necessary. This project will reconstruct a high-resolution record of the South Asian Monsoon for the past 20 million years. Modeling studies will help interpret those records. The project will support three graduate students (two at Louisiana State University and one at the University of Oklahoma) and a postdoc at Purdue University. The project will also support the PI’s participation in two outreach programs, the Baton Rouge Rainwater Program and a multi-school Outreach Activities program. This is a project that is jointly funded by the National Science Foundation’s Directorate of Geosciences (NSF/GEO) and the National Environment Research Council (NERC) of the United Kingdom (UK) via the NSF/GEO-NERC Lead Agency Agreement. This Agreement allows a single joint US/UK proposal to be submitted and peer-reviewed by the Agency whose investigator has the largest proportion of the budget. Upon successful joint determination of an award, each Agency funds the proportion of the budget and the investigators associated with its own country.The evolution of the South Asian Monsoon represents multi-sphere interactions involving the lithosphere (the uplift of Tibetan Plateau), atmosphere (monsoonal circulations), hydrosphere (hydrological cycle), and biosphere (e.g., C4-grassland expansion, and primary productivity). Understanding how the South Asian monsoon behaved, evolved, and, in turn, was modified by these different processes is key to understanding and quantifying how the monsoon will change in the future. Decades of efforts have focused on characterizing its multifaceted character and revolutionized our knowledge by offering different perspectives to link the above phenomena. However, due to its complex nature, a vital issue arose. Proxy studies from the ocean and terrestrial records give opposing signals on whether the South Asian Monsoon strengthened or weakened during the Miocene. In this project, a US-UK team will collaborate to resolve the conundrum. The project will combine state-of-the-art geochemical proxies and numerical modeling to unpack the processes and mechanisms behind the Miocene Asian monsoon perturbations. The project will establish an integrated record of the heterogeneous regional paleohydrology and the long-term histories of upwelling and primary productivity; it will then test the linkage between the above processes and potential driving forces using the high-resolution General Climate Model (GCM) and the updated HadCM3L simulations.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

南亚季风是最重要的大气循环系统之一。它决定了地球上最不受欢迎的地方的水资源，并直接影响了十亿多人。南亚季风地区正在进行活跃的山区建筑，并展现出强烈的地形浮雕。该地区在降雨和海洋温度和生产力方面经历了戏剧性的梯度。不同的降雨模式可能会带来全球经济影响。确实，近年来极端气候事件在喜马拉雅地区及其他地区产生了巨大的社会和经济影响。仅基于工具日期的建模预测不太可能描绘南亚季风的整个光谱。为了更好地了解系统的现代变异性和未来的变化，必须长期进行过去的季风活动。该项目将在过去的2000万年中重建南亚季风的高分辨率记录。建模研究将有助于解释这些记录。该项目将支持三名研究生（路易斯安那州立大学的两名研究生，一名在俄克拉荷马大学）和普渡大学的博士后。该项目还将支持PI参与两个外展计划，巴吞鲁日雨水计划和一项多学校外展活动计划。这是一个由国家科学基金会地球科学局（NSF/GEO）和英国国家环境研究委员会（NERC）共同资助的项目，该项目通过NSF/GEO-GEO-NERC领先机构协议。该协议允许该机构提交和同行评审的一项联合提案，其调查员的预算比例最大。成功确定奖励后，每个机构都资助了预算的比例和与其自己的国家相关的调查人员。南亚季风的演变代表了涉及岩石圈（藏族高原的提升），大气循环（季风循环），水上循环（水流周期）和生物群（E。g.g.g.g.，C4-grass）的多球相互作用。了解南亚季风的行为，进化，进而被这些不同的过程所修改是理解和量化季风将来将如何变化的关键。数十年的努力集中在表征其多方面的性格，并通过提供不同的观点来链接上述现象，从而彻底改变了我们的知识。但是，由于其复杂的性质，出现了一个至关重要的问题。来自海洋和地面记录的代理研究发出了关于中新世期间南亚季风是否加强或减弱的相反信号。在这个项目中，一个US-UK团队将合作解决难题。该项目将结合最新的地球化学代理和数值建模，以解开中新世亚洲季风扰动背后的过程和机制。该项目将建立异质区域古水学的综合记录以及上升和主要生产力的长期历史；然后，它将使用高分辨率一般气候模型（GCM）和更新的HADCM3L模拟来测试上述过程与潜在驱动力之间的联系。该奖项反映了NSF的法定任务，并被认为是通过基金会的知识功绩和更广泛影响的评估标准通过评估来评估的。