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

这个AGS博士后研究员（PRF）奖支持模拟末次冰期最大期（LGM）和现今气候从大气环流模型到古气候代理数据的比较，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末次盛冰期区域气候的主导大尺度机制，以及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古数据为基准，这些古数据是过去气候参数的替代物，从而测试这些模型正确模拟过去气候状态的能力，并有助于确保产生区域反应的动力过程得到良好的代表和适当的模拟。这反过来又将有助于评估不同气候条件下模型的区域能力，为今后改进和发展这些模型提供信息，主要关注的是行星尺度动力学对区域尺度温度和水文循环变化的影响。 研究员将研究中纬度定常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面温度及降水的影响，目的是量化模式中的区域敏感性。 从古气候建模相互比较项目（PMIP）模拟模型运行的输出将被比较，作为在这三个地区的温度和水文循环的代理公布的数据集。 该研究员将进一步研究已确定的动力机制，包括其对边界的敏感性，并利用动力气象学模型（LMDZ）强迫不确定性。该项目有助于提高对跨时间尺度气候变异性区域反应的理解，并有助于开展重要的外联活动。 Markham中学的学生主要是西班牙裔和加勒比黑人，将在该中学开展的外联活动旨在改善对少数群体的科学传播和教育。 此外，明年将与研究员合作的一名本科生也来自科学界代表性不足的少数民族。 作为一个额外的扩大参与练习，该研究员将在加州大学洛杉矶分校分会的科学演讲中讨论拟议中的研究，促进奇卡诺人和美洲原住民科学（SACNAS），并将进一步招募一名来自SACNAS分会的本科生参与研究和外展活动。

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.