P2C2: Synthesis Study of the Tropical Rain Belt Through the Holocene

P2C2：全新世热带雨带综合研究

• 批准号: 1502806
• 负责人: David Noone
• 金额: $ 63.64万
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-06-01 至 2021-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1502806&HistoricalAwards=false
• 关键词: P2C2; Synthesis; Study; Tropical; Rain

This project is motivated by the idea that the tropical rain belt (TRB), including the oceanic and continental Inter-tropical Convergence Zone (ITCZ) and seasonal monsoon systems, plays a fundamental role in the Earth's climate and strongly impacts societies, ecosystems, and global climate. During the Holocene, forced changes in the TRB have been invoked to explain many observed failures and increases in tropical rainfall. However, the physical processes driving changes in TRB dynamics and their relationship to climate forcings remain unclear.This award generally aims to evaluate the drivers of Holocene TRB variations by utilizing a wide network of tropical paleo-hydroclimate records and new isotope-enabled model simulations. This project aims to: (1) evaluate the response of the TRB's distinct components (convergence over ocean and land, and seasonal monsoons) to Holocene climate forcing functions and feedbacks, including biogeophysical feedbacks and interactions with ENSO; and (2) translate changes in the TRB into changes in proxy recorders, including those based on precipitation isotope ratios.The scientific objectives of this project will be achieved through a synthesis of climate proxy records of TRB position and intensity and a series of model experiments with NCAR's isotope-enabled Community Earth System Model (CESM). Time slices at different stages of the Holocene will provide a climate dynamical context for the synthesized data product. A set of sensitivity experiments will help determine the degree to which biosphere-atmosphere feedbacks and ENSO/TRB (El Nino-Southern Oscillation) interactions influence both isotopic and non-isotopic proxies. A toolkit of emerging proxy system models will be integrated into CESM to compare directly with the network of proxy records. It is expected that this project will help evaluate the forced changes in the TRB projected for the 21st century.The Broader Impacts include upgrading and maintaining the isotopic version of the CESM, enabling the development of a post-doctoral scholar community at the institution, developing discovery-based undergraduate educational experiences, and adding new scientific data and analyses to help improve the understanding of natural climate variability.

该项目的动机是热带雨带（TRB），包括海洋和大陆热带辐合带（ITCZ）和季节性季风系统，在地球气候中起着重要作用，并强烈影响社会，生态系统和全球气候。 在全新世期间，TRB的强迫变化被用来解释许多观察到的失败和热带降雨的增加。然而，驱动TRB动力学变化的物理过程及其与气候强迫的关系仍不清楚。该奖项通常旨在通过利用广泛的热带古水文气候记录和新的同位素启用模型模拟来评估全新世TRB变化的驱动因素。 该项目旨在：（1）评估TRB不同组成部分的响应（海洋和陆地上的辐合和季节性季风）对全新世气候强迫作用和反馈的影响，包括地球物理反馈和与ENSO的相互作用;以及（2）将TRB中的改变转换成代理记录器中的改变，包括基于降水同位素比率的方法。本项目的科学目标将通过综合气候代用记录来实现TRB的位置和强度和一系列的模型实验与NCAR的同位素启用社区地球系统模型（CESM）。 全新世不同阶段的时间片将为综合数据产品提供气候动力学背景。一系列敏感性实验将有助于确定生物圈-大气反馈和厄尔尼诺/南方涛动相互作用对同位素和非同位素替代指标的影响程度。将把一套新出现的代理制度模式纳入CESM，以便与代理记录网络直接进行比较。预计该项目将有助于评估预计在21世纪的TRB的强制变化。更广泛的影响包括升级和维护CESM的同位素版本，使该机构能够发展博士后学者社区，发展基于发现的本科教育经验，并增加新的科学数据和分析，以帮助提高对自然气候变化的理解。