Assessing Transport Pathways into the Arctic and Their Efficiencies

在这项多方面的研究中，研究人员将增进对基本知识的理解，并提高我们模拟进入北极地区的远程大气传输路径的能力。这对污染物和水蒸气等重要大气成分有影响，对人类健康和全球气候变化都有影响。调查人员将以系统的方式使用一系列建模方法和实验，最终确定模型的不足之处，并改善基本物理动力学和大气传输之间的联系。该项目将支持一名职业生涯早期的首席研究员，并为一名研究生和博士后研究员提供培训。研究人员将与国家大气研究中心和国家航空航天局的同事合作，为更广泛的科学和模型界提供一座桥梁。该项目的目标是对最先进的全球化学气候模型的性能进行系统评估，以促进对进入北极的远程大气传输路径、其效率和潜在机制的基本了解。通过综合模型和理想化模型的使用，这项研究将改善动力学和运输之间的联系，并有助于查明运输模拟中潜在的模型缺陷。研究人员将首先使用化学-气候模型倡议实验评估进入北极的多模型模拟。其次，他们将通过在综合大气模型中进行脉冲示踪诊断来研究进入北极的运输路径及其过境时间分布。最后，使用简化的大气模型，研究人员将评估潜在的动力机制和敏感性。最终结果将是更好地了解进入北极的长距离运输、其季节内和年际变化以及未来的变化。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

In this multifaceted study, the investigators will advance fundamental understanding and our ability to simulate long-range atmospheric transport pathways into the Arctic region. This has implications for important atmospheric constituents such as pollutants and water vapor, affecting human health and climate change both regionally and globally. The investigators will use a range of modeling approaches and experiments in a systematic fashion that will ultimately identify model deficiencies as well as improve links between the underlying physical dynamics and atmospheric transport. The project will support an early career lead investigator, as well as provide training for a graduate student and postdoctoral investigator. The investigators will collaborate with colleagues at the National Center for Atmospheric Research and National Aeronautics and Space Administration, providing a bridge to the wider scientific and modeling communities.The objectives of this project are to provide a systematic assessment of the performance of state-of-the-art global chemistry climate models to advance fundamental understanding of long-range atmospheric transport pathways into the Arctic, their efficiencies, and the underlying mechanisms. With the use of both comprehensive and idealized models, the research will improve links between dynamics and transport and help pinpoint potential model deficiencies in simulation of transport. The investigators will first assess the multi-model simulations of transport into the Arctic using Chemistry-Climate Model Initiative experiments. Second, they will study transport pathways into the Arctic and their transit time distributions by conducting pulse tracer diagnostics in a comprehensive atmospheric model. Finally, using a simplified atmospheric model, the investigators will assess underlying dynamical mechanisms and sensitivities. The end result will be a better understanding of long-range transport into the Arctic, its intra-seasonal and inter-annual variability, and future change.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.