AGS-PRF Impacts of Large-Scale Dynamics on Regional Climate Sensitivity: Model-Paleodata Comparisons in Three Mid-Latitude Regions

AGS博士后研究员奖(PRF)支持对从大气环流模型到古气候替代数据的末次冰盛期(LGM)和现代气候的模拟进行比较，以研究影响区域气候的动力机制。这一分析将有助于确定影响三个中纬度地区LGM区域气候的主要大尺度机制，并阐明区域古数据解释大尺度古气候现象的能力。用于预测未来气候变化的气候模型将以作为过去气候参数替代物的古数据为基准，从而测试这些模型正确模拟过去气候状态的能力，并帮助确保很好地描述和适当模拟涉及产生区域响应的动态过程。这反过来将有助于评估模型在与当前气候不同的气候下的区域能力，为这些模型的未来改进和发展提供信息。主要感兴趣的是行星尺度动力学对区域尺度温度变化和水文循环的影响。该研究员将研究中纬度驻波和季风动力学等现象对中国黄土高原、美国西南部和美国中西部三个地区大气和地表温度和降水的影响，目的是量化模式中的区域敏感性。古气候模拟国际比较项目(PMIP)模拟模型运行的输出将与作为这三个地区温度和水文循环替代指标的已公布数据集进行比较。该研究员将进一步研究已确定的动力学机制，包括它们对边界和强迫不确定性的敏感性，使用实验室的动力学模型(LMDZ)。该项目有助于增进对各区域在不同时间尺度上对气候变化的反应和重大外联活动的了解。Markham中学的学生主要是西班牙裔和非洲裔加勒比人，将在该中学开展外联活动，目的是改善对少数群体的科学交流和教育。此外，明年将与这位研究员共事的本科生中，也有一位来自科学界代表性不足的少数群体。作为一项额外的扩大参与活动，该研究员将在芝加哥大学洛杉矶分会(SACNAS)的分会就拟议中的研究进行科学演讲，并将进一步从SACNAS分会招募一名本科生参与第二年的研究和外联活动。

This AGS PostDoctoral Research Fellow (PRF) award supports the comparison of simulations of last glacial maximum (LGM) and present-day climates from general circulation models to paleoclimatic proxy data to investigate dynamical mechanisms that affect regional climates. This analysis will help to determine the dominant large-scale mechanisms affecting the regional climates at LGM of three mid-latitude regions, as well as clarify the ability of regional paleodata to elucidate large-scale paleoclimatic phenomena. Climate models that are used to predict future climate changes will be benchmarked against paleodata that serve as proxies for past climate parameters thereby testing the ability of these models to correctly simulate past climate states and helping to ensure that dynamical processes involved in generating regional responses are well represented and properly simulated. This, in turn, will help assess the regional capabilities of models under climates different than the current, informing future improvements and development of these models.Of principal interest is the influence of planetary-scale dynamics on regional-scale changes in temperature and the hydrological cycle. The Fellow will examine the effects of such phenomena as mid-latitudinal stationary waves and monsoon dynamics on atmospheric and surface temperatures and precipitation in three regions including the Chinese Loess Plateau, the southwestern United States, and the midwestern United States with the aim of quantifying the regional sensitivities in the models. Output from Paleoclimate Modelling Intercomparison Project (PMIP) simulation model runs will be compared to published datasets that serve as proxies for temperatures and the hydrological cycle in these three regions. The Fellow will further investigate identified dynamical mechanisms, including their sensitivities to boundary and forcing uncertainties by use of the Laboratoire de Météorologie Dynamique (LMDZ) model. This project helps to improve understanding surrounding regional response to climate variability across temporal scales and significant outreach activities. Outreach activities to be conducted at Markham Middle School, whose students are predominantly Hispanic and Afro-Caribbean, are intended for improving science communication and education to minorities. Also, one of the undergraduates who will work with the Fellow over the next year is also from an underrepresented minority in the sciences. As an additional broadening participation exercise, the Fellow will give a science talk about the proposed research at the UCLA chapter of the Society for the Advancement of Chicanos and Native Americans in Science (SACNAS), and will furthermore recruit an undergraduate student from the SACNAS chapter to be involved in the research and outreach activities during the second year of the fellowship.