Applying Ice Cores, Instrumental Climate Records and Climate Modeling Towards a Mechanistic Understanding of Antarctic Climate Variability on Interannual to Multidecadal Time Scale

NCAR的研究人员旨在研究过去~250年的年际、多年代际和更长时间尺度上的南极气候变率，以更好地了解南极地区控制气候变化的潜在物理机制。一系列观测、模拟和代理（如冰芯）信息将被组合和解释。重点将放在过去~250年南极冰芯记录的年际到多年代际变化的分析和机制解释上。对观测冰芯记录的分析将用于确定变率的主要模式，并将这些模式与现有的南极温度重建和来自各种仪器数据集的热带气候异常联系起来。特别是，模拟实验将用于研究与温室气体和平流层臭氧浓度变化相关的海表温度强迫（热带与热带外）和直接大气辐射强迫对南极气候变率的相对作用。模拟部分将使用现有的和改进的大气环流模拟，这些模拟是由1870年至今的观测历史驱动的。最近的CCSM CAM（社区气候系统模式，社区大气模式）模式明确纳入了水同位素示踪方案，将用于评估同位素模式的性能，并扩大目前对冰芯记录的解释。参与正在进行的独立资助的NCAR少数民族服务教育工作（SOARS -大气研究中的重要机会）是扩大参与大气和相关科学的一种手段。“这项奖励是根据2009年美国复苏和再投资法案（公法111-5）资助的。”

AbstractResearchers at NCAR aim to address Antarctic climate variability on interannual, multidecadal and longer timescales over the past ~250 years as a means to better understand the underlying physical mechanisms controlling climate change in the southern polar region. A range of observational, modeling and proxy (e.g. ice core) information will be combined and interpreted. Effort will be focused on the analysis and mechanistic interpretation of the interannual-to-multidecadal variability in the Antarctic ice core records over the past ~250 years. Analyses of observational ice core records will be used to define the leading patterns of variability and relate those to existing Antarctic temperature reconstructions and to tropical climate anomalies from various instrumental data sets. In particular, modeling experiments will be used to examine the relative roles of sea surface temperature forcing (tropical vs. extra-tropical) and direct atmospheric radiative forcing associated with changes in greenhouse gas and stratospheric ozone concentrations on Antarctic climate variability.The modeling component will use existing and modified atmospheric general circulation simulations driven with observational history from 1870 to the present. An augmentation of the most recent CCSM CAM (Community Climate System Model, Community Atmospheric Model) model explicitly incorporating a water isotope tracer scheme will be used to evaluate the isotope model performance, and to broaden current interpretation of ice core records.Participation in an ongoing and independently funded NCAR minority serving education effort (SOARS - Significant Opportunities in Atmospheric Research) is offered as a means of broadening participation in the atmospheric and related sciences."This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5)."