Collaborative Research: P2C2--Quantifying Holocene Climate Variations through Data Assimilation using Proxies and General Circulation Models (GCMs) Output

该项目旨在通过结合代理数据和模式模拟，为全新世时期开发一个代理模式同化框架。开发的框架将允许解决关键的问题，在全新世的温度趋势显示观测和模型之间的差异。此外，还将调查北美洲西部和北方非洲主要水文变化-干旱-的气候动力学。为了改善模型与数据的比较，研究人员将使用代理系统建模方法，以改善对全新世代理记录中记录的气候信号的解释，包括温度和降水的季节性。潜在的更广泛影响包括更好地了解全新世气候动态，调查模型模拟与全新世温度趋势观测之间的不匹配;以及美国西北部和北非的主要水文气候变化。将开发一个以年度分辨率重建的全新世多变量数据库和一个精心策划的全新世代理记录数据库，供更广泛的气候界使用。将为研究生和初出茅庐的科学家举办两个关于古气候数据同化的讲习班，以培训下一代古气候科学家。该项目将支持三名早期职业科学家和一名研究生。全新世多变量重建和代理网络将是有益的产品，将有利于整个古气候社区。这个奖项反映了NSF的法定使命，并已被认为是值得通过使用基金会的智力价值和更广泛的影响审查标准进行评估的支持。

This project aims to develop a proxy-model assimilation framework for the Holocene period by combining proxy data and model simulations. The developed framework will allow to address critical questions about the temperature trends during the Holocene which show a discrepancy between observations and models. In addition, the climate dynamics underlying major hydrological changes-Drying- in western North America and Northern Africa will be investigated. To improve the model-data comparison, the researchers will use a proxy-system modeling approach in order to improve the interpretation of the climate signal recorded in the Holocene proxy-records, including seasonality of temperature and precipitation.The potential Broader Impacts include a greater understanding of the Holocene climate dynamics, investigating the mismatch between model simulations and observation of temperature trends during the Holocene; and major hydroclimate shifts in northwestern US and North Africa. A Holocene multi-variable reconstruction at annual resolution and a curated Holocene proxy-record database will be developed and made available for the broader climate community. Two workshops on paleoclimate data assimilation will be organized for graduate students and early career scientists to train the next generation of paleoclimate scientists. The project will support three early career scientists and a graduate student. The Holocene multi-variables reconstruction and proxy-network will be useful products that will benefit the paleoclimate community at large.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.