AGS/EAR-PRF: Confronting Multi-scale Complexity in the Dynamics of Regional U.S. Land-atmosphere Coupling Energetics and Their Links to Climate Variability and Change

由加州大学欧文分校的Famiglietti教授和Pritchard教授主持，首席研究员（P.I.）将试图澄清陆地表面耦合在美国中部有组织对流和降雨演变中的作用。该策略将采用新颖的方法技术，在一个独特的多尺度虚拟实验室中分离和测量陆地和大气之间的能量交换系统的组成部分。通过使用单个分量放大解构陆地-大气耦合反馈中的非线性复杂性，并归因于响应，作者将开发一个整体的物理框架，并将其应用于以下问题：陆面耦合在产生和维持美国中部中尺度对流系统和夏季降水中的作用是什么？在区域和全球水文背景下，明确解决的陆地非均质性对于真实地代表中尺度陆地对流相互作用有多重要？灌溉驱动的水文气候反馈对驱动美国中部对流降水机制的现实表现是否可靠？中尺度对流及其与自然和人为水循环的相互作用将如何改变未来的气候？陆地表面反馈是否在调节反应中起作用？知识价值：美国中部的陆-气耦合在调节当地天气和气候方面起着特别关键的作用。水文循环将如何响应灌溉和气候变化的人为影响取决于一套复杂的陆地表面能量交换机制，其耦合行为难以理解。在这个水文界面推进知识需要洞察其非线性敏感性通过控制的多尺度数值实验，包括链接到非局部和柱能量学的全局反馈。着眼于美国中部的水文气候及其对灌溉和气候变化的响应，作者试图在这方面取得进展。该研究建立在作者的博士经验的基础上，应用大气物理学的基本原理来研究中尺度对流，气候变化，以及传统和超参数化全球气候模式模拟中的气溶胶-云相互作用。共同指导策略结合了Famiglietti教授和Pritchard教授在大气和水文科学方面的不同专业知识，以解决他们个人研究重点的前沿科学问题。更广泛的影响：更广泛的影响活动和共同指导计划将加强加州大学欧文分校在研究和研究生水平教育方面的陆地-大气耦合，并与美国中部与陆地-大气界面有利害关系的政策制定者加强联系。P.I.将帮助启动一个以陆地-大气相互作用为重点的研究生系列研讨会，将水文学和气候科学专家聚集在一起，促进跨学科研究和前沿科学思想的交叉交流。该项目将扩大美国中部美国国家科学基金会大气过程多尺度模拟中心与政策制定者、研究人员和教育工作者之间的公共伙伴关系，通过公共宣传活动将研究与相关利益相关者直接联系起来。这些努力将有助于向科学界和公众传播新的研究成果和经验，并指导P.I.自己的专业发展。

Hosted by Professors Famiglietti and Pritchard at the University of California, Irvine, the principal investigator (P.I.) will seek to clarify the role of land surface coupling in the evolution of organized convection and rainfall in the Central United States (US). The strategy will be to employ novel methodological techniques to isolate and measure components of the energy exchange system between the land and atmosphere, in a uniquely multi-scale virtual laboratory. By deconstructing nonlinear complexities in land-atmosphere coupling feedbacks using individual component amplification, and attributing responses, the author will develop a holistic physical framework and apply it to the following questions:1. What is the role of land surface coupling in generating and sustaining mesoscale convective systems and summer precipitation in the Central US?2. How critical is explicitly resolved land heterogeneity for realistically representing mesoscale land-convection interactions in the context of regional and global hydrology?3. Are irrigation-driven hydro-climate feedbacks robust to a realistic representation of the mechanisms that drive convective precipitation in the Central US?4. How will mesoscale convection and its interaction with the natural and manmade water cycles change in future climate? Do land-surface feedbacks play a role in mediating the response?Intellectual Merit:Land-atmosphere coupling in the Central US plays an especially critical role in mediating local weather and climate. How the hydrological cycle will respond to the anthropogenic influences of irrigation and climate change depends on a complex set of land-surface energy exchange mechanisms whose coupled behavior is difficult to understand. Advancing knowledge at this hydrologic interface requires insight into its nonlinear sensitivities through controlled multi-scale numerical experiments, including links to non-local and global feedbacks on column energetics. Focusing on Central US hydro-climate and its response to irrigation and climate change, the author seeks to make progress on this front. The research builds on the author's doctoral experience applying fundamental principles of atmospheric physics to investigate mesoscale convection, climate change, and aerosol-cloud interactions in simulations from conventional and super-parameterized global climate models. The co-mentoring strategy combines the diverse expertise of Professors Famiglietti and Pritchard in atmospheric and hydrologic science to address frontier scientific questions at the interface of their individual research foci.Broader Impacts:The broader impact activities and co-mentoring plan will strengthen land-atmosphere coupling in research and graduate level education at the University of California, Irvine, and with policy makers who have a stake in the land-atmosphere interface in the Central US. The P.I. will help launch a graduate seminar series focused on land-atmosphere interactions, bringing together experts in hydrology and climate science to foster interdisciplinary research and cross-pollination of frontier science ideas. The P.I. will expand public partnerships with policy makers, researchers, and educators that have been developed by the NSF Center for Multiscale Modeling of Atmospheric Processes in the Central US to directly link the research to relevant stakeholders through public outreach activities. These efforts will help spread new research results and experience to both the scientific community and general public, and guide the P.I.'s own professional development.